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xen: features and fixes for 4.11-rc0 

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Merge tag 'for-linus-4.11-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen updates from Juergen Gross:
 "Xen features and fixes:

   - a series from Boris Ostrovsky adding support for booting Linux as
     Xen PVH guest

   - a series from Juergen Gross streamlining the xenbus driver

   - a series from Paul Durrant adding support for the new device model
     hypercall

   - several small corrections"

* tag 'for-linus-4.11-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/privcmd: add IOCTL_PRIVCMD_RESTRICT
  xen/privcmd: Add IOCTL_PRIVCMD_DM_OP
  xen/privcmd: return -ENOTTY for unimplemented IOCTLs
  xen: optimize xenbus driver for multiple concurrent xenstore accesses
  xen: modify xenstore watch event interface
  xen: clean up xenbus internal headers
  xenbus: Neaten xenbus_va_dev_error
  xen/pvh: Use Xen's emergency_restart op for PVH guests
  xen/pvh: Enable CPU hotplug
  xen/pvh: PVH guests always have PV devices
  xen/pvh: Initialize grant table for PVH guests
  xen/pvh: Make sure we don't use ACPI_IRQ_MODEL_PIC for SCI
  xen/pvh: Bootstrap PVH guest
  xen/pvh: Import PVH-related Xen public interfaces
  xen/x86: Remove PVH support
  x86/boot/32: Convert the 32-bit pgtable setup code from assembly to C
  xen/manage: correct return value check on xenbus_scanf()
  x86/xen: Fix APIC id mismatch warning on Intel
  xen/netback: set default upper limit of tx/rx queues to 8
  xen/netfront: set default upper limit of tx/rx queues to 8
zero-colors
Linus Torvalds 2017-02-21 13:53:41 -08:00
parent b8989bccd6 4610d240d6
commit 252b95c0ed
49 changed files with 1733 additions and 974 deletions
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1
arch/arm/xen/enlighten.c
View File

@ -457,4 +457,5 @@ EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
EXPORT_SYMBOL_GPL(privcmd_call);

1
arch/arm/xen/hypercall.S
View File

@ -92,6 +92,7 @@ HYPERCALL1(tmem_op);
HYPERCALL1(platform_op_raw);
HYPERCALL2(multicall);
HYPERCALL2(vm_assist);
HYPERCALL3(dm_op);
ENTRY(privcmd_call)
stmdb sp!, {r4}

1
arch/arm64/xen/hypercall.S
View File

@ -84,6 +84,7 @@ HYPERCALL1(tmem_op);
HYPERCALL1(platform_op_raw);
HYPERCALL2(multicall);
HYPERCALL2(vm_assist);
HYPERCALL3(dm_op);
ENTRY(privcmd_call)
mov x16, x0

7
arch/x86/include/asm/xen/hypercall.h
View File

@ -472,6 +472,13 @@ HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
return _hypercall2(int, xenpmu_op, op, arg);
}
static inline int
HYPERVISOR_dm_op(
domid_t dom, unsigned int nr_bufs, void *bufs)
{
return _hypercall3(int, dm_op, dom, nr_bufs, bufs);
}
static inline void
MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
{

2
arch/x86/xen/Kconfig
View File

@ -53,5 +53,5 @@ config XEN_DEBUG_FS
config XEN_PVH
bool "Support for running as a PVH guest"
depends on X86_64 && XEN && XEN_PVHVM
depends on XEN && XEN_PVHVM && ACPI
def_bool n

1
arch/x86/xen/Makefile
View File

@ -23,3 +23,4 @@ obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_DOM0) += vga.o
obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o
obj-$(CONFIG_XEN_EFI) += efi.o
obj-$(CONFIG_XEN_PVH) += xen-pvh.o

2
arch/x86/xen/apic.c
View File

@ -145,7 +145,7 @@ static void xen_silent_inquire(int apicid)
static int xen_cpu_present_to_apicid(int cpu)
{
if (cpu_present(cpu))
return xen_get_apic_id(xen_apic_read(APIC_ID));
return cpu_data(cpu).apicid;
else
return BAD_APICID;
}

279
arch/x86/xen/enlighten.c
View File

@ -45,6 +45,7 @@
#include <xen/interface/memory.h>
#include <xen/interface/nmi.h>
#include <xen/interface/xen-mca.h>
#include <xen/interface/hvm/start_info.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/hvm.h>
@ -176,6 +177,20 @@ struct tls_descs {
*/
static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
#ifdef CONFIG_XEN_PVH
/*
* PVH variables.
*
* xen_pvh and pvh_bootparams need to live in data segment since they
* are used after startup_{32|64}, which clear .bss, are invoked.
*/
bool xen_pvh __attribute__((section(".data"))) = 0;
struct boot_params pvh_bootparams __attribute__((section(".data")));
struct hvm_start_info pvh_start_info;
unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
#endif
static void clamp_max_cpus(void)
{
#ifdef CONFIG_SMP
@ -1138,10 +1153,11 @@ void xen_setup_vcpu_info_placement(void)
xen_vcpu_setup(cpu);
}
/* xen_vcpu_setup managed to place the vcpu_info within the
* percpu area for all cpus, so make use of it. Note that for
* PVH we want to use native IRQ mechanism. */
if (have_vcpu_info_placement && !xen_pvh_domain()) {
/*
* xen_vcpu_setup managed to place the vcpu_info within the
* percpu area for all cpus, so make use of it.
*/
if (have_vcpu_info_placement) {
pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
@ -1413,49 +1429,9 @@ static void __init xen_boot_params_init_edd(void)
* Set up the GDT and segment registers for -fstack-protector. Until
* we do this, we have to be careful not to call any stack-protected
* function, which is most of the kernel.
*
* Note, that it is __ref because the only caller of this after init
* is PVH which is not going to use xen_load_gdt_boot or other
* __init functions.
*/
static void __ref xen_setup_gdt(int cpu)
static void xen_setup_gdt(int cpu)
{
if (xen_feature(XENFEAT_auto_translated_physmap)) {
#ifdef CONFIG_X86_64
unsigned long dummy;
load_percpu_segment(cpu); /* We need to access per-cpu area */
switch_to_new_gdt(cpu); /* GDT and GS set */
/* We are switching of the Xen provided GDT to our HVM mode
* GDT. The new GDT has __KERNEL_CS with CS.L = 1
* and we are jumping to reload it.
*/
asm volatile ("pushq %0\n"
"leaq 1f(%%rip),%0\n"
"pushq %0\n"
"lretq\n"
"1:\n"
: "=&r" (dummy) : "0" (__KERNEL_CS));
/*
* While not needed, we also set the %es, %ds, and %fs
* to zero. We don't care about %ss as it is NULL.
* Strictly speaking this is not needed as Xen zeros those
* out (and also MSR_FS_BASE, MSR_GS_BASE, MSR_KERNEL_GS_BASE)
*
* Linux zeros them in cpu_init() and in secondary_startup_64
* (for BSP).
*/
loadsegment(es, 0);
loadsegment(ds, 0);
loadsegment(fs, 0);
#else
/* PVH: TODO Implement. */
BUG();
#endif
return; /* PVH does not need any PV GDT ops. */
}
pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
pv_cpu_ops.load_gdt = xen_load_gdt_boot;
@ -1466,59 +1442,6 @@ static void __ref xen_setup_gdt(int cpu)
pv_cpu_ops.load_gdt = xen_load_gdt;
}
#ifdef CONFIG_XEN_PVH
/*
* A PV guest starts with default flags that are not set for PVH, set them
* here asap.
*/
static void xen_pvh_set_cr_flags(int cpu)
{
/* Some of these are setup in 'secondary_startup_64'. The others:
* X86_CR0_TS, X86_CR0_PE, X86_CR0_ET are set by Xen for HVM guests
* (which PVH shared codepaths), while X86_CR0_PG is for PVH. */
write_cr0(read_cr0() | X86_CR0_MP | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM);
if (!cpu)
return;
/*
* For BSP, PSE PGE are set in probe_page_size_mask(), for APs
* set them here. For all, OSFXSR OSXMMEXCPT are set in fpu__init_cpu().
*/
if (boot_cpu_has(X86_FEATURE_PSE))
cr4_set_bits_and_update_boot(X86_CR4_PSE);
if (boot_cpu_has(X86_FEATURE_PGE))
cr4_set_bits_and_update_boot(X86_CR4_PGE);
}
/*
* Note, that it is ref - because the only caller of this after init
* is PVH which is not going to use xen_load_gdt_boot or other
* __init functions.
*/
void __ref xen_pvh_secondary_vcpu_init(int cpu)
{
xen_setup_gdt(cpu);
xen_pvh_set_cr_flags(cpu);
}
static void __init xen_pvh_early_guest_init(void)
{
if (!xen_feature(XENFEAT_auto_translated_physmap))
return;
BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
xen_pvh_early_cpu_init(0, false);
xen_pvh_set_cr_flags(0);
#ifdef CONFIG_X86_32
BUG(); /* PVH: Implement proper support. */
#endif
}
#endif /* CONFIG_XEN_PVH */
static void __init xen_dom0_set_legacy_features(void)
{
x86_platform.legacy.rtc = 1;
@ -1555,24 +1478,17 @@ asmlinkage __visible void __init xen_start_kernel(void)
xen_domain_type = XEN_PV_DOMAIN;
xen_setup_features();
#ifdef CONFIG_XEN_PVH
xen_pvh_early_guest_init();
#endif
xen_setup_machphys_mapping();
/* Install Xen paravirt ops */
pv_info = xen_info;
pv_init_ops = xen_init_ops;
if (!xen_pvh_domain()) {
pv_cpu_ops = xen_cpu_ops;
pv_cpu_ops = xen_cpu_ops;
x86_platform.get_nmi_reason = xen_get_nmi_reason;
}
x86_platform.get_nmi_reason = xen_get_nmi_reason;
if (xen_feature(XENFEAT_auto_translated_physmap))
x86_init.resources.memory_setup = xen_auto_xlated_memory_setup;
else
x86_init.resources.memory_setup = xen_memory_setup;
x86_init.resources.memory_setup = xen_memory_setup;
x86_init.oem.arch_setup = xen_arch_setup;
x86_init.oem.banner = xen_banner;
@ -1665,18 +1581,15 @@ asmlinkage __visible void __init xen_start_kernel(void)
/* set the limit of our address space */
xen_reserve_top();
/* PVH: runs at default kernel iopl of 0 */
if (!xen_pvh_domain()) {
/*
* We used to do this in xen_arch_setup, but that is too late
* on AMD were early_cpu_init (run before ->arch_setup()) calls
* early_amd_init which pokes 0xcf8 port.
*/
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
if (rc != 0)
xen_raw_printk("physdev_op failed %d\n", rc);
}
/*
* We used to do this in xen_arch_setup, but that is too late
* on AMD were early_cpu_init (run before ->arch_setup()) calls
* early_amd_init which pokes 0xcf8 port.
*/
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
if (rc != 0)
xen_raw_printk("physdev_op failed %d\n", rc);
#ifdef CONFIG_X86_32
/* set up basic CPUID stuff */
@ -1758,6 +1671,102 @@ asmlinkage __visible void __init xen_start_kernel(void)
#endif
}
#ifdef CONFIG_XEN_PVH
static void xen_pvh_arch_setup(void)
{
#ifdef CONFIG_ACPI
/* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */
if (nr_ioapics == 0)
acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
#endif
}
static void __init init_pvh_bootparams(void)
{
struct xen_memory_map memmap;
unsigned int i;
int rc;
memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_map);
set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_map);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc) {
xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
BUG();
}
if (memmap.nr_entries < E820MAX - 1) {
pvh_bootparams.e820_map[memmap.nr_entries].addr =
ISA_START_ADDRESS;
pvh_bootparams.e820_map[memmap.nr_entries].size =
ISA_END_ADDRESS - ISA_START_ADDRESS;
pvh_bootparams.e820_map[memmap.nr_entries].type =
E820_RESERVED;
memmap.nr_entries++;
} else
xen_raw_printk("Warning: Can fit ISA range into e820\n");
sanitize_e820_map(pvh_bootparams.e820_map,
ARRAY_SIZE(pvh_bootparams.e820_map),
&memmap.nr_entries);
pvh_bootparams.e820_entries = memmap.nr_entries;
for (i = 0; i < pvh_bootparams.e820_entries; i++)
e820_add_region(pvh_bootparams.e820_map[i].addr,
pvh_bootparams.e820_map[i].size,
pvh_bootparams.e820_map[i].type);
pvh_bootparams.hdr.cmd_line_ptr =
pvh_start_info.cmdline_paddr;
/* The first module is always ramdisk. */
if (pvh_start_info.nr_modules) {
struct hvm_modlist_entry *modaddr =
__va(pvh_start_info.modlist_paddr);
pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
pvh_bootparams.hdr.ramdisk_size = modaddr->size;
}
/*
* See Documentation/x86/boot.txt.
*
* Version 2.12 supports Xen entry point but we will use default x86/PC
* environment (i.e. hardware_subarch 0).
*/
pvh_bootparams.hdr.version = 0x212;
pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */
}
/*
* This routine (and those that it might call) should not use
* anything that lives in .bss since that segment will be cleared later.
*/
void __init xen_prepare_pvh(void)
{
u32 msr;
u64 pfn;
if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
pvh_start_info.magic);
BUG();
}
xen_pvh = 1;
msr = cpuid_ebx(xen_cpuid_base() + 2);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
init_pvh_bootparams();
x86_init.oem.arch_setup = xen_pvh_arch_setup;
}
#endif
void __ref xen_hvm_init_shared_info(void)
{
int cpu;
@ -1797,20 +1806,29 @@ void __ref xen_hvm_init_shared_info(void)
static void __init init_hvm_pv_info(void)
{
int major, minor;
uint32_t eax, ebx, ecx, edx, pages, msr, base;
u64 pfn;
uint32_t eax, ebx, ecx, edx, base;
base = xen_cpuid_base();
cpuid(base + 1, &eax, &ebx, &ecx, &edx);
eax = cpuid_eax(base + 1);
major = eax >> 16;
minor = eax & 0xffff;
printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
cpuid(base + 2, &pages, &msr, &ecx, &edx);
xen_domain_type = XEN_HVM_DOMAIN;
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
/* PVH set up hypercall page in xen_prepare_pvh(). */
if (xen_pvh_domain())
pv_info.name = "Xen PVH";
else {
u64 pfn;
uint32_t msr;
pv_info.name = "Xen HVM";
msr = cpuid_ebx(base + 2);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
}
xen_setup_features();
@ -1819,10 +1837,6 @@ static void __init init_hvm_pv_info(void)
this_cpu_write(xen_vcpu_id, ebx);
else
this_cpu_write(xen_vcpu_id, smp_processor_id());
pv_info.name = "Xen HVM";
xen_domain_type = XEN_HVM_DOMAIN;
}
#endif
@ -1910,6 +1924,9 @@ static void __init xen_hvm_guest_init(void)
x86_init.irqs.intr_init = xen_init_IRQ;
xen_hvm_init_time_ops();
xen_hvm_init_mmu_ops();
if (xen_pvh_domain())
machine_ops.emergency_restart = xen_emergency_restart;
#ifdef CONFIG_KEXEC_CORE
machine_ops.shutdown = xen_hvm_shutdown;
machine_ops.crash_shutdown = xen_hvm_crash_shutdown;

21
arch/x86/xen/mmu.c
View File

@ -1792,10 +1792,6 @@ static void __init set_page_prot_flags(void *addr, pgprot_t prot,
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
pte_t pte = pfn_pte(pfn, prot);
/* For PVH no need to set R/O or R/W to pin them or unpin them. */
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
BUG();
}
@ -1902,8 +1898,7 @@ static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
* level2_ident_pgt, and level2_kernel_pgt. This means that only the
* kernel has a physical mapping to start with - but that's enough to
* get __va working. We need to fill in the rest of the physical
* mapping once some sort of allocator has been set up. NOTE: for
* PVH, the page tables are native.
* mapping once some sort of allocator has been set up.
*/
void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
{
@ -2812,16 +2807,6 @@ static int do_remap_gfn(struct vm_area_struct *vma,
BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
if (xen_feature(XENFEAT_auto_translated_physmap)) {
#ifdef CONFIG_XEN_PVH
/* We need to update the local page tables and the xen HAP */
return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
prot, domid, pages);
#else
return -EINVAL;
#endif
}
rmd.mfn = gfn;
rmd.prot = prot;
/* We use the err_ptr to indicate if there we are doing a contiguous
@ -2915,10 +2900,6 @@ int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
if (!pages || !xen_feature(XENFEAT_auto_translated_physmap))
return 0;
#ifdef CONFIG_XEN_PVH
return xen_xlate_unmap_gfn_range(vma, numpgs, pages);
#else
return -EINVAL;
#endif
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);

4
arch/x86/xen/platform-pci-unplug.c
View File

@ -73,8 +73,8 @@ bool xen_has_pv_devices(void)
if (!xen_domain())
return false;
/* PV domains always have them. */
if (xen_pv_domain())
/* PV and PVH domains always have them. */
if (xen_pv_domain() || xen_pvh_domain())
return true;
/* And user has xen_platform_pci=0 set in guest config as

37
arch/x86/xen/setup.c
View File

@ -914,39 +914,6 @@ char * __init xen_memory_setup(void)
return "Xen";
}
/*
* Machine specific memory setup for auto-translated guests.
*/
char * __init xen_auto_xlated_memory_setup(void)
{
struct xen_memory_map memmap;
int i;
int rc;
memmap.nr_entries = ARRAY_SIZE(xen_e820_map);
set_xen_guest_handle(memmap.buffer, xen_e820_map);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc < 0)
panic("No memory map (%d)\n", rc);
xen_e820_map_entries = memmap.nr_entries;
sanitize_e820_map(xen_e820_map, ARRAY_SIZE(xen_e820_map),
&xen_e820_map_entries);
for (i = 0; i < xen_e820_map_entries; i++)
e820_add_region(xen_e820_map[i].addr, xen_e820_map[i].size,
xen_e820_map[i].type);
/* Remove p2m info, it is not needed. */
xen_start_info->mfn_list = 0;
xen_start_info->first_p2m_pfn = 0;
xen_start_info->nr_p2m_frames = 0;
return "Xen";
}
/*
* Set the bit indicating "nosegneg" library variants should be used.
* We only need to bother in pure 32-bit mode; compat 32-bit processes
@ -1032,8 +999,8 @@ void __init xen_pvmmu_arch_setup(void)
void __init xen_arch_setup(void)
{
xen_panic_handler_init();
if (!xen_feature(XENFEAT_auto_translated_physmap))
xen_pvmmu_arch_setup();
xen_pvmmu_arch_setup();
#ifdef CONFIG_ACPI
if (!(xen_start_info->flags & SIF_INITDOMAIN)) {

78
arch/x86/xen/smp.c
View File

@ -99,18 +99,8 @@ static void cpu_bringup(void)
local_irq_enable();
}
/*
* Note: cpu parameter is only relevant for PVH. The reason for passing it
* is we can't do smp_processor_id until the percpu segments are loaded, for
* which we need the cpu number! So we pass it in rdi as first parameter.
*/
asmlinkage __visible void cpu_bringup_and_idle(int cpu)
asmlinkage __visible void cpu_bringup_and_idle(void)
{
#ifdef CONFIG_XEN_PVH
if (xen_feature(XENFEAT_auto_translated_physmap) &&
xen_feature(XENFEAT_supervisor_mode_kernel))
xen_pvh_secondary_vcpu_init(cpu);
#endif
cpu_bringup();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
@ -404,61 +394,47 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
gdt = get_cpu_gdt_table(cpu);
#ifdef CONFIG_X86_32
/* Note: PVH is not yet supported on x86_32. */
ctxt->user_regs.fs = __KERNEL_PERCPU;
ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
#endif
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
ctxt->flags = VGCF_IN_KERNEL;
ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
ctxt->user_regs.ds = __USER_DS;
ctxt->user_regs.es = __USER_DS;
ctxt->user_regs.ss = __KERNEL_DS;
ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
ctxt->flags = VGCF_IN_KERNEL;
ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
ctxt->user_regs.ds = __USER_DS;
ctxt->user_regs.es = __USER_DS;
ctxt->user_regs.ss = __KERNEL_DS;
xen_copy_trap_info(ctxt->trap_ctxt);
xen_copy_trap_info(ctxt->trap_ctxt);
ctxt->ldt_ents = 0;
ctxt->ldt_ents = 0;
BUG_ON((unsigned long)gdt & ~PAGE_MASK);
BUG_ON((unsigned long)gdt & ~PAGE_MASK);
gdt_mfn = arbitrary_virt_to_mfn(gdt);
make_lowmem_page_readonly(gdt);
make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
gdt_mfn = arbitrary_virt_to_mfn(gdt);
make_lowmem_page_readonly(gdt);
make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
ctxt->gdt_frames[0] = gdt_mfn;
ctxt->gdt_ents = GDT_ENTRIES;
ctxt->gdt_frames[0] = gdt_mfn;
ctxt->gdt_ents = GDT_ENTRIES;
ctxt->kernel_ss = __KERNEL_DS;
ctxt->kernel_sp = idle->thread.sp0;
ctxt->kernel_ss = __KERNEL_DS;
ctxt->kernel_sp = idle->thread.sp0;
#ifdef CONFIG_X86_32
ctxt->event_callback_cs = __KERNEL_CS;
ctxt->failsafe_callback_cs = __KERNEL_CS;
ctxt->event_callback_cs = __KERNEL_CS;
ctxt->failsafe_callback_cs = __KERNEL_CS;
#else
ctxt->gs_base_kernel = per_cpu_offset(cpu);
#endif
ctxt->event_callback_eip =
(unsigned long)xen_hypervisor_callback;
ctxt->failsafe_callback_eip =
(unsigned long)xen_failsafe_callback;
ctxt->user_regs.cs = __KERNEL_CS;
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
}
#ifdef CONFIG_XEN_PVH
else {
/*
* The vcpu comes on kernel page tables which have the NX pte
* bit set. This means before DS/SS is touched, NX in
* EFER must be set. Hence the following assembly glue code.
*/
ctxt->user_regs.eip = (unsigned long)xen_pvh_early_cpu_init;
ctxt->user_regs.rdi = cpu;
ctxt->user_regs.rsi = true; /* entry == true */
}
ctxt->gs_base_kernel = per_cpu_offset(cpu);
#endif
ctxt->event_callback_eip =
(unsigned long)xen_hypervisor_callback;
ctxt->failsafe_callback_eip =
(unsigned long)xen_failsafe_callback;
ctxt->user_regs.cs = __KERNEL_CS;
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))

8
arch/x86/xen/smp.h
View File

@ -21,12 +21,4 @@ static inline int xen_smp_intr_init(unsigned int cpu)
static inline void xen_smp_intr_free(unsigned int cpu) {}
#endif /* CONFIG_SMP */
#ifdef CONFIG_XEN_PVH
extern void xen_pvh_early_cpu_init(int cpu, bool entry);
#else
static inline void xen_pvh_early_cpu_init(int cpu, bool entry)
{
}
#endif
#endif

62
arch/x86/xen/xen-head.S
View File

@ -16,25 +16,6 @@
#include <xen/interface/xen-mca.h>
#include <asm/xen/interface.h>
#ifdef CONFIG_XEN_PVH
#define PVH_FEATURES_STR "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel"
/* Note the lack of 'hvm_callback_vector'. Older hypervisor will
* balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in
* XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore.
*/
#define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \
(1 << XENFEAT_auto_translated_physmap) | \
(1 << XENFEAT_supervisor_mode_kernel) | \
(1 << XENFEAT_hvm_callback_vector))
/* The XENFEAT_writable_page_tables is not stricly necessary as we set that
* up regardless whether this CONFIG option is enabled or not, but it
* clarifies what the right flags need to be.
*/
#else
#define PVH_FEATURES_STR ""
#define PVH_FEATURES (0)
#endif
__INIT
ENTRY(startup_xen)
cld
@ -54,41 +35,6 @@ ENTRY(startup_xen)
__FINIT
#ifdef CONFIG_XEN_PVH
/*
* xen_pvh_early_cpu_init() - early PVH VCPU initialization
* @cpu: this cpu number (%rdi)
* @entry: true if this is a secondary vcpu coming up on this entry
* point, false if this is the boot CPU being initialized for
* the first time (%rsi)
*
* Note: This is called as a function on the boot CPU, and is the entry point
* on the secondary CPU.
*/
ENTRY(xen_pvh_early_cpu_init)
mov %rsi, %r11
/* Gather features to see if NX implemented. */
mov $0x80000001, %eax
cpuid
mov %edx, %esi
mov $MSR_EFER, %ecx
rdmsr
bts $_EFER_SCE, %eax
bt $20, %esi
jnc 1f /* No NX, skip setting it */
bts $_EFER_NX, %eax
1: wrmsr
#ifdef CONFIG_SMP
cmp $0, %r11b
jne cpu_bringup_and_idle
#endif
ret
#endif /* CONFIG_XEN_PVH */
.pushsection .text
.balign PAGE_SIZE
ENTRY(hypercall_page)
@ -114,10 +60,10 @@ ENTRY(hypercall_page)
#endif
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR)
ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) |
(1 << XENFEAT_writable_page_tables) |
(1 << XENFEAT_dom0))
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
.ascii "!writable_page_tables|pae_pgdir_above_4gb")
ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
.long (1 << XENFEAT_writable_page_tables) | (1 << XENFEAT_dom0))
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,

1
arch/x86/xen/xen-ops.h
View File

@ -146,5 +146,4 @@ __visible void xen_adjust_exception_frame(void);
extern int xen_panic_handler_init(void);
void xen_pvh_secondary_vcpu_init(int cpu);
#endif /* XEN_OPS_H */

161
arch/x86/xen/xen-pvh.S 100644
View File

@ -0,0 +1,161 @@
/*
* Copyright C 2016, Oracle and/or its affiliates. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
.code32
.text
#define _pa(x) ((x) - __START_KERNEL_map)
#include <linux/elfnote.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/asm.h>
#include <asm/boot.h>
#include <asm/processor-flags.h>
#include <asm/msr.h>
#include <xen/interface/elfnote.h>
__HEAD
/*
* Entry point for PVH guests.
*
* Xen ABI specifies the following register state when we come here:
*
* - `ebx`: contains the physical memory address where the loader has placed
* the boot start info structure.
* - `cr0`: bit 0 (PE) must be set. All the other writeable bits are cleared.
* - `cr4`: all bits are cleared.
* - `cs `: must be a 32-bit read/execute code segment with a base of ‘0’
* and a limit of ‘0xFFFFFFFF’. The selector value is unspecified.
* - `ds`, `es`: must be a 32-bit read/write data segment with a base of
* ‘0’ and a limit of ‘0xFFFFFFFF’. The selector values are all
* unspecified.
* - `tr`: must be a 32-bit TSS (active) with a base of '0' and a limit
* of '0x67'.
* - `eflags`: bit 17 (VM) must be cleared. Bit 9 (IF) must be cleared.
* Bit 8 (TF) must be cleared. Other bits are all unspecified.
*
* All other processor registers and flag bits are unspecified. The OS is in
* charge of setting up it's own stack, GDT and IDT.
*/
ENTRY(pvh_start_xen)
cld
lgdt (_pa(gdt))
mov $(__BOOT_DS),%eax
mov %eax,%ds
mov %eax,%es
mov %eax,%ss
/* Stash hvm_start_info. */
mov $_pa(pvh_start_info), %edi
mov %ebx, %esi
mov _pa(pvh_start_info_sz), %ecx
shr $2,%ecx
rep
movsl
mov $_pa(early_stack_end), %esp
/* Enable PAE mode. */
mov %cr4, %eax
orl $X86_CR4_PAE, %eax
mov %eax, %cr4
#ifdef CONFIG_X86_64
/* Enable Long mode. */
mov $MSR_EFER, %ecx
rdmsr
btsl $_EFER_LME, %eax
wrmsr
/* Enable pre-constructed page tables. */
mov $_pa(init_level4_pgt), %eax
mov %eax, %cr3
mov $(X86_CR0_PG | X86_CR0_PE), %eax
mov %eax, %cr0
/* Jump to 64-bit mode. */
ljmp $__KERNEL_CS, $_pa(1f)
/* 64-bit entry point. */
.code64
1:
call xen_prepare_pvh
/* startup_64 expects boot_params in %rsi. */
mov $_pa(pvh_bootparams), %rsi
mov $_pa(startup_64), %rax
jmp *%rax
#else /* CONFIG_X86_64 */
call mk_early_pgtbl_32
mov $_pa(initial_page_table), %eax
mov %eax, %cr3
mov %cr0, %eax
or $(X86_CR0_PG | X86_CR0_PE), %eax
mov %eax, %cr0
ljmp $__BOOT_CS, $1f
1:
call xen_prepare_pvh
mov $_pa(pvh_bootparams), %esi
/* startup_32 doesn't expect paging and PAE to be on. */
ljmp $__BOOT_CS, $_pa(2f)
2:
mov %cr0, %eax
and $~X86_CR0_PG, %eax
mov %eax, %cr0
mov %cr4, %eax
and $~X86_CR4_PAE, %eax
mov %eax, %cr4
ljmp $__BOOT_CS, $_pa(startup_32)
#endif
END(pvh_start_xen)
.section ".init.data","aw"
.balign 8
gdt:
.word gdt_end - gdt_start
.long _pa(gdt_start)
.word 0
gdt_start:
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x0000000000000000 /* reserved */
#ifdef CONFIG_X86_64
.quad GDT_ENTRY(0xa09a, 0, 0xfffff) /* __KERNEL_CS */
#else
.quad GDT_ENTRY(0xc09a, 0, 0xfffff) /* __KERNEL_CS */
#endif
.quad GDT_ENTRY(0xc092, 0, 0xfffff) /* __KERNEL_DS */
gdt_end:
.balign 4
early_stack:
.fill 256, 1, 0
early_stack_end:
ELFNOTE(Xen, XEN_ELFNOTE_PHYS32_ENTRY,
_ASM_PTR (pvh_start_xen - __START_KERNEL_map))

6
drivers/block/xen-blkback/xenbus.c
View File

@ -38,8 +38,8 @@ struct backend_info {
static struct kmem_cache *xen_blkif_cachep;
static void connect(struct backend_info *);
static int connect_ring(struct backend_info *);
static void backend_changed(struct xenbus_watch *, const char **,
unsigned int);
static void backend_changed(struct xenbus_watch *, const char *,
const char *);
static void xen_blkif_free(struct xen_blkif *blkif);
static void xen_vbd_free(struct xen_vbd *vbd);
@ -661,7 +661,7 @@ fail:
* ready, connect.
*/
static void backend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
int err;
unsigned major;

6
drivers/net/xen-netback/netback.c
View File

@ -67,6 +67,7 @@ module_param(rx_drain_timeout_msecs, uint, 0444);
unsigned int rx_stall_timeout_msecs = 60000;
module_param(rx_stall_timeout_msecs, uint, 0444);
#define MAX_QUEUES_DEFAULT 8
unsigned int xenvif_max_queues;
module_param_named(max_queues, xenvif_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
@ -1622,11 +1623,12 @@ static int __init netback_init(void)
if (!xen_domain())
return -ENODEV;
/* Allow as many queues as there are CPUs if user has not
/* Allow as many queues as there are CPUs but max. 8 if user has not
* specified a value.
*/
if (xenvif_max_queues == 0)
xenvif_max_queues = num_online_cpus();
xenvif_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
num_online_cpus());
if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) {
pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n",

8
drivers/net/xen-netback/xenbus.c
View File

@ -734,7 +734,7 @@ static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
}
static void xen_net_rate_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
struct xenvif *vif = container_of(watch, struct xenvif, credit_watch);
struct xenbus_device *dev = xenvif_to_xenbus_device(vif);
@ -791,7 +791,7 @@ static void xen_unregister_credit_watch(struct xenvif *vif)
}
static void xen_mcast_ctrl_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
struct xenvif *vif = container_of(watch, struct xenvif,
mcast_ctrl_watch);
@ -866,8 +866,8 @@ static void unregister_hotplug_status_watch(struct backend_info *be)
}
static void hotplug_status_changed(struct xenbus_watch *watch,
const char **vec,
unsigned int vec_size)
const char *path,
const char *token)
{
struct backend_info *be = container_of(watch,
struct backend_info,

6
drivers/net/xen-netfront.c
View File

@ -57,6 +57,7 @@
#include <xen/interface/grant_table.h>
/* Module parameters */
#define MAX_QUEUES_DEFAULT 8
static unsigned int xennet_max_queues;
module_param_named(max_queues, xennet_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
@ -2166,11 +2167,12 @@ static int __init netif_init(void)
pr_info("Initialising Xen virtual ethernet driver\n");
/* Allow as many queues as there are CPUs if user has not
/* Allow as many queues as there are CPUs inut max. 8 if user has not
* specified a value.
*/
if (xennet_max_queues == 0)
xennet_max_queues = num_online_cpus();
xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
num_online_cpus());
return xenbus_register_frontend(&netfront_driver);
}

7
drivers/xen/cpu_hotplug.c
View File

@ -68,13 +68,12 @@ static void vcpu_hotplug(unsigned int cpu)
}
static void handle_vcpu_hotplug_event(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
unsigned int cpu;
char *cpustr;
const char *node = vec[XS_WATCH_PATH];
cpustr = strstr(node, "cpu/");
cpustr = strstr(path, "cpu/");
if (cpustr != NULL) {
sscanf(cpustr, "cpu/%u", &cpu);
vcpu_hotplug(cpu);
@ -107,7 +106,7 @@ static int __init setup_vcpu_hotplug_event(void)
.notifier_call = setup_cpu_watcher };
#ifdef CONFIG_X86
if (!xen_pv_domain())
if (!xen_pv_domain() && !xen_pvh_domain())
#else
if (!xen_domain())
#endif

1
drivers/xen/events/events_base.c
View File

@ -1704,7 +1704,6 @@ void __init xen_init_IRQ(void)
pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
eoi_gmfn.gmfn = virt_to_gfn(pirq_eoi_map);
rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
/* TODO: No PVH support for PIRQ EOI */
if (rc != 0) {
free_page((unsigned long) pirq_eoi_map);
pirq_eoi_map = NULL;

10
drivers/xen/grant-table.c
View File

@ -1146,13 +1146,13 @@ EXPORT_SYMBOL_GPL(gnttab_init);
static int __gnttab_init(void)
{
/* Delay grant-table initialization in the PV on HVM case */
if (xen_hvm_domain())
return 0;
if (!xen_pv_domain())
if (!xen_domain())
return -ENODEV;
/* Delay grant-table initialization in the PV on HVM case */
if (xen_hvm_domain() && !xen_pvh_domain())
return 0;
return gnttab_init();
}
/* Starts after core_initcall so that xen_pvh_gnttab_setup can be called

8
drivers/xen/manage.c
View File

@ -218,7 +218,7 @@ static struct shutdown_handler shutdown_handlers[] = {
};
static void shutdown_handler(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
char *str;
struct xenbus_transaction xbt;
@ -266,8 +266,8 @@ static void shutdown_handler(struct xenbus_watch *watch,
}
#ifdef CONFIG_MAGIC_SYSRQ
static void sysrq_handler(struct xenbus_watch *watch, const char **vec,
unsigned int len)
static void sysrq_handler(struct xenbus_watch *watch, const char *path,
const char *token)
{
char sysrq_key = '\0';
struct xenbus_transaction xbt;
@ -277,7 +277,7 @@ static void sysrq_handler(struct xenbus_watch *watch, const char **vec,
err = xenbus_transaction_start(&xbt);
if (err)
return;
if (!xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key)) {
if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 0) {
pr_err("Unable to read sysrq code in control/sysrq\n");
xenbus_transaction_end(xbt, 1);
return;

226
drivers/xen/privcmd.c
View File

@ -22,6 +22,7 @@
#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <linux/miscdevice.h>
#include <linux/moduleparam.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
@ -32,6 +33,7 @@
#include <xen/xen.h>
#include <xen/privcmd.h>
#include <xen/interface/xen.h>
#include <xen/interface/hvm/dm_op.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/xen-ops.h>
@ -43,16 +45,36 @@ MODULE_LICENSE("GPL");
#define PRIV_VMA_LOCKED ((void *)1)
static unsigned int privcmd_dm_op_max_num = 16;
module_param_named(dm_op_max_nr_bufs, privcmd_dm_op_max_num, uint, 0644);
MODULE_PARM_DESC(dm_op_max_nr_bufs,
"Maximum number of buffers per dm_op hypercall");
static unsigned int privcmd_dm_op_buf_max_size = 4096;
module_param_named(dm_op_buf_max_size, privcmd_dm_op_buf_max_size, uint,
0644);
MODULE_PARM_DESC(dm_op_buf_max_size,
"Maximum size of a dm_op hypercall buffer");
struct privcmd_data {
domid_t domid;
};
static int privcmd_vma_range_is_mapped(
struct vm_area_struct *vma,
unsigned long addr,
unsigned long nr_pages);
static long privcmd_ioctl_hypercall(void __user *udata)
static long privcmd_ioctl_hypercall(struct file *file, void __user *udata)
{
struct privcmd_data *data = file->private_data;
struct privcmd_hypercall hypercall;
long ret;
/* Disallow arbitrary hypercalls if restricted */
if (data->domid != DOMID_INVALID)
return -EPERM;
if (copy_from_user(&hypercall, udata, sizeof(hypercall)))
return -EFAULT;
@ -229,8 +251,9 @@ static int mmap_gfn_range(void *data, void *state)
return 0;
}
static long privcmd_ioctl_mmap(void __user *udata)
static long privcmd_ioctl_mmap(struct file *file, void __user *udata)
{
struct privcmd_data *data = file->private_data;
struct privcmd_mmap mmapcmd;
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
@ -245,6 +268,10 @@ static long privcmd_ioctl_mmap(void __user *udata)
if (copy_from_user(&mmapcmd, udata, sizeof(mmapcmd)))
return -EFAULT;
/* If restriction is in place, check the domid matches */
if (data->domid != DOMID_INVALID && data->domid != mmapcmd.dom)
return -EPERM;
rc = gather_array(&pagelist,
mmapcmd.num, sizeof(struct privcmd_mmap_entry),
mmapcmd.entry);
@ -416,8 +443,10 @@ static int alloc_empty_pages(struct vm_area_struct *vma, int numpgs)
static const struct vm_operations_struct privcmd_vm_ops;
static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
static long privcmd_ioctl_mmap_batch(
struct file *file, void __user *udata, int version)
{
struct privcmd_data *data = file->private_data;
int ret;
struct privcmd_mmapbatch_v2 m;
struct mm_struct *mm = current->mm;
@ -446,6 +475,10 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
return -EINVAL;
}
/* If restriction is in place, check the domid matches */
if (data->domid != DOMID_INVALID && data->domid != m.dom)
return -EPERM;
nr_pages = DIV_ROUND_UP(m.num, XEN_PFN_PER_PAGE);
if ((m.num <= 0) || (nr_pages > (LONG_MAX >> PAGE_SHIFT)))
return -EINVAL;
@ -548,37 +581,210 @@ out_unlock:
goto out;
}
static int lock_pages(
struct privcmd_dm_op_buf kbufs[], unsigned int num,
struct page *pages[], unsigned int nr_pages)
{
unsigned int i;
for (i = 0; i < num; i++) {
unsigned int requested;
int pinned;
requested = DIV_ROUND_UP(
offset_in_page(kbufs[i].uptr) + kbufs[i].size,
PAGE_SIZE);
if (requested > nr_pages)
return -ENOSPC;
pinned = get_user_pages_fast(
(unsigned long) kbufs[i].uptr,
requested, FOLL_WRITE, pages);
if (pinned < 0)
return pinned;
nr_pages -= pinned;
pages += pinned;
}
return 0;
}
static void unlock_pages(struct page *pages[], unsigned int nr_pages)
{
unsigned int i;
if (!pages)
return;
for (i = 0; i < nr_pages; i++) {
if (pages[i])
put_page(pages[i]);
}
}
static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
{
struct privcmd_data *data = file->private_data;
struct privcmd_dm_op kdata;
struct privcmd_dm_op_buf *kbufs;
unsigned int nr_pages = 0;
struct page **pages = NULL;
struct xen_dm_op_buf *xbufs = NULL;
unsigned int i;
long rc;
if (copy_from_user(&kdata, udata, sizeof(kdata)))
return -EFAULT;
/* If restriction is in place, check the domid matches */
if (data->domid != DOMID_INVALID && data->domid != kdata.dom)
return -EPERM;
if (kdata.num == 0)
return 0;
if (kdata.num > privcmd_dm_op_max_num)
return -E2BIG;
kbufs = kcalloc(kdata.num, sizeof(*kbufs), GFP_KERNEL);
if (!kbufs)
return -ENOMEM;
if (copy_from_user(kbufs, kdata.ubufs,
sizeof(*kbufs) * kdata.num)) {
rc = -EFAULT;
goto out;
}
for (i = 0; i < kdata.num; i++) {
if (kbufs[i].size > privcmd_dm_op_buf_max_size) {
rc = -E2BIG;
goto out;
}
if (!access_ok(VERIFY_WRITE, kbufs[i].uptr,
kbufs[i].size)) {
rc = -EFAULT;
goto out;
}
nr_pages += DIV_ROUND_UP(
offset_in_page(kbufs[i].uptr) + kbufs[i].size,
PAGE_SIZE);
}
pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
rc = -ENOMEM;
goto out;
}
xbufs = kcalloc(kdata.num, sizeof(*xbufs), GFP_KERNEL);
if (!xbufs) {
rc = -ENOMEM;
goto out;
}
rc = lock_pages(kbufs, kdata.num, pages, nr_pages);
if (rc)
goto out;
for (i = 0; i < kdata.num; i++) {
set_xen_guest_handle(xbufs[i].h, kbufs[i].uptr);
xbufs[i].size = kbufs[i].size;
}
xen_preemptible_hcall_begin();
rc = HYPERVISOR_dm_op(kdata.dom, kdata.num, xbufs);
xen_preemptible_hcall_end();
out:
unlock_pages(pages, nr_pages);
kfree(xbufs);
kfree(pages);
kfree(kbufs);
return rc;
}
static long privcmd_ioctl_restrict(struct file *file, void __user *udata)
{
struct privcmd_data *data = file->private_data;
domid_t dom;
if (copy_from_user(&dom, udata, sizeof(dom)))
return -EFAULT;
/* Set restriction to the specified domain, or check it matches */
if (data->domid == DOMID_INVALID)
data->domid = dom;
else if (data->domid != dom)
return -EINVAL;
return 0;
}
static long privcmd_ioctl(struct file *file,
unsigned int cmd, unsigned long data)
{
int ret = -ENOSYS;
int ret = -ENOTTY;
void __user *udata = (void __user *) data;
switch (cmd) {
case IOCTL_PRIVCMD_HYPERCALL:
ret = privcmd_ioctl_hypercall(udata);
ret = privcmd_ioctl_hypercall(file, udata);
break;
case IOCTL_PRIVCMD_MMAP:
ret = privcmd_ioctl_mmap(udata);
ret = privcmd_ioctl_mmap(file, udata);
break;
case IOCTL_PRIVCMD_MMAPBATCH:
ret = privcmd_ioctl_mmap_batch(udata, 1);
ret = privcmd_ioctl_mmap_batch(file, udata, 1);
break;
case IOCTL_PRIVCMD_MMAPBATCH_V2:
ret = privcmd_ioctl_mmap_batch(udata, 2);
ret = privcmd_ioctl_mmap_batch(file, udata, 2);
break;
case IOCTL_PRIVCMD_DM_OP:
ret = privcmd_ioctl_dm_op(file, udata);
break;
case IOCTL_PRIVCMD_RESTRICT:
ret = privcmd_ioctl_restrict(file, udata);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int privcmd_open(struct inode *ino, struct file *file)
{
struct privcmd_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
/* DOMID_INVALID implies no restriction */
data->domid = DOMID_INVALID;
file->private_data = data;
return 0;
}
static int privcmd_release(struct inode *ino, struct file *file)
{
struct privcmd_data *data = file->private_data;
kfree(data);
return 0;
}
static void privcmd_close(struct vm_area_struct *vma)
{
struct page **pages = vma->vm_private_data;
@ -647,6 +853,8 @@ static int privcmd_vma_range_is_mapped(
const struct file_operations xen_privcmd_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = privcmd_ioctl,
.open = privcmd_open,
.release = privcmd_release,
.mmap = privcmd_mmap,
};
EXPORT_SYMBOL_GPL(xen_privcmd_fops);

2
drivers/xen/xen-balloon.c
View File

@ -55,7 +55,7 @@ static int register_balloon(struct device *dev);
/* React to a change in the target key */
static void watch_target(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
unsigned long long new_target;
int err;

2
drivers/xen/xen-pciback/xenbus.c
View File

@ -652,7 +652,7 @@ out:
}
static void xen_pcibk_be_watch(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
struct xen_pcibk_device *pdev =
container_of(watch, struct xen_pcibk_device, be_watch);

135
drivers/xen/xenbus/xenbus.h 100644
View File

@ -0,0 +1,135 @@
/*
* Private include for xenbus communications.
*
* Copyright (C) 2005 Rusty Russell, IBM Corporation
* Copyright (C) 2005 XenSource Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef _XENBUS_XENBUS_H
#define _XENBUS_XENBUS_H
#include <linux/mutex.h>
#include <linux/uio.h>
#include <xen/xenbus.h>
#define XEN_BUS_ID_SIZE 20
struct xen_bus_type {
char *root;
unsigned int levels;
int (*get_bus_id)(char bus_id[XEN_BUS_ID_SIZE], const char *nodename);
int (*probe)(struct xen_bus_type *bus, const char *type,
const char *dir);
void (*otherend_changed)(struct xenbus_watch *watch, const char *path,
const char *token);
struct bus_type bus;
};
enum xenstore_init {
XS_UNKNOWN,
XS_PV,
XS_HVM,
XS_LOCAL,
};
struct xs_watch_event {
struct list_head list;
unsigned int len;
struct xenbus_watch *handle;
const char *path;
const char *token;
char body[];
};
enum xb_req_state {
xb_req_state_queued,
xb_req_state_wait_reply,
xb_req_state_got_reply,
xb_req_state_aborted
};
struct xb_req_data {
struct list_head list;
wait_queue_head_t wq;
struct xsd_sockmsg msg;
enum xsd_sockmsg_type type;
char *body;
const struct kvec *vec;
int num_vecs;
int err;
enum xb_req_state state;
void (*cb)(struct xb_req_data *);
void *par;
};
extern enum xenstore_init xen_store_domain_type;
extern const struct attribute_group *xenbus_dev_groups[];
extern struct mutex xs_response_mutex;
extern struct list_head xs_reply_list;
extern struct list_head xb_write_list;
extern wait_queue_head_t xb_waitq;
extern struct mutex xb_write_mutex;
int xs_init(void);
int xb_init_comms(void);
void xb_deinit_comms(void);
int xs_watch_msg(struct xs_watch_event *event);
void xs_request_exit(struct xb_req_data *req);
int xenbus_match(struct device *_dev, struct device_driver *_drv);
int xenbus_dev_probe(struct device *_dev);
int xenbus_dev_remove(struct device *_dev);
int xenbus_register_driver_common(struct xenbus_driver *drv,
struct xen_bus_type *bus,
struct module *owner,
const char *mod_name);
int xenbus_probe_node(struct xen_bus_type *bus,
const char *type,
const char *nodename);
int xenbus_probe_devices(struct xen_bus_type *bus);
void xenbus_dev_changed(const char *node, struct xen_bus_type *bus);
void xenbus_dev_shutdown(struct device *_dev);
int xenbus_dev_suspend(struct device *dev);
int xenbus_dev_resume(struct device *dev);
int xenbus_dev_cancel(struct device *dev);
void xenbus_otherend_changed(struct xenbus_watch *watch,
const char *path, const char *token,
int ignore_on_shutdown);
int xenbus_read_otherend_details(struct xenbus_device *xendev,
char *id_node, char *path_node);
void xenbus_ring_ops_init(void);
int xenbus_dev_request_and_reply(struct xsd_sockmsg *msg, void *par);
void xenbus_dev_queue_reply(struct xb_req_data *req);
#endif

45
drivers/xen/xenbus/xenbus_client.c
View File

@ -47,7 +47,7 @@
#include <xen/xen.h>
#include <xen/features.h>
#include "xenbus_probe.h"
#include "xenbus.h"
#define XENBUS_PAGES(_grants) (DIV_ROUND_UP(_grants, XEN_PFN_PER_PAGE))
@ -115,7 +115,7 @@ EXPORT_SYMBOL_GPL(xenbus_strstate);
int xenbus_watch_path(struct xenbus_device *dev, const char *path,
struct xenbus_watch *watch,
void (*callback)(struct xenbus_watch *,
const char **, unsigned int))
const char *, const char *))
{
int err;
@ -153,7 +153,7 @@ EXPORT_SYMBOL_GPL(xenbus_watch_path);
int xenbus_watch_pathfmt(struct xenbus_device *dev,
struct xenbus_watch *watch,
void (*callback)(struct xenbus_watch *,
const char **, unsigned int),
const char *, const char *),
const char *pathfmt, ...)
{
int err;
@ -259,53 +259,34 @@ int xenbus_frontend_closed(struct xenbus_device *dev)
}
EXPORT_SYMBOL_GPL(xenbus_frontend_closed);
/**
* Return the path to the error node for the given device, or NULL on failure.
* If the value returned is non-NULL, then it is the caller's to kfree.
*/
static char *error_path(struct xenbus_device *dev)
{
return kasprintf(GFP_KERNEL, "error/%s", dev->nodename);
}
static void xenbus_va_dev_error(struct xenbus_device *dev, int err,
const char *fmt, va_list ap)
{
unsigned int len;
char *printf_buffer = NULL;
char *path_buffer = NULL;
char *printf_buffer;
char *path_buffer;
#define PRINTF_BUFFER_SIZE 4096
printf_buffer = kmalloc(PRINTF_BUFFER_SIZE, GFP_KERNEL);
if (printf_buffer == NULL)
goto fail;
if (!printf_buffer)
return;
len = sprintf(printf_buffer, "%i ", -err);
vsnprintf(printf_buffer+len, PRINTF_BUFFER_SIZE-len, fmt, ap);
vsnprintf(printf_buffer + len, PRINTF_BUFFER_SIZE - len, fmt, ap);
dev_err(&dev->dev, "%s\n", printf_buffer);
path_buffer = error_path(dev);
if (path_buffer == NULL) {
path_buffer = kasprintf(GFP_KERNEL, "error/%s", dev->nodename);
if (!path_buffer ||
xenbus_write(XBT_NIL, path_buffer, "error", printf_buffer))
dev_err(&dev->dev, "failed to write error node for %s (%s)\n",
dev->nodename, printf_buffer);
goto fail;
}
dev->nodename, printf_buffer);
if (xenbus_write(XBT_NIL, path_buffer, "error", printf_buffer) != 0) {
dev_err(&dev->dev, "failed to write error node for %s (%s)\n",
dev->nodename, printf_buffer);
goto fail;
}
fail:
kfree(printf_buffer);
kfree(path_buffer);
}
/**
* xenbus_dev_error
* @dev: xenbus device

309
drivers/xen/xenbus/xenbus_comms.c
View File

@ -34,19 +34,31 @@
#include <linux/wait.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <xen/xenbus.h>
#include <asm/xen/hypervisor.h>
#include <xen/events.h>
#include <xen/page.h>
#include "xenbus_comms.h"
#include "xenbus.h"
/* A list of replies. Currently only one will ever be outstanding. */
LIST_HEAD(xs_reply_list);
/* A list of write requests. */
LIST_HEAD(xb_write_list);
DECLARE_WAIT_QUEUE_HEAD(xb_waitq);
DEFINE_MUTEX(xb_write_mutex);
/* Protect xenbus reader thread against save/restore. */
DEFINE_MUTEX(xs_response_mutex);
static int xenbus_irq;
static struct task_struct *xenbus_task;
static DECLARE_WORK(probe_work, xenbus_probe);
static DECLARE_WAIT_QUEUE_HEAD(xb_waitq);
static irqreturn_t wake_waiting(int irq, void *unused)
{
@ -84,30 +96,31 @@ static const void *get_input_chunk(XENSTORE_RING_IDX cons,
return buf + MASK_XENSTORE_IDX(cons);
}
static int xb_data_to_write(void)
{
struct xenstore_domain_interface *intf = xen_store_interface;
return (intf->req_prod - intf->req_cons) != XENSTORE_RING_SIZE &&
!list_empty(&xb_write_list);
}
/**
* xb_write - low level write
* @data: buffer to send
* @len: length of buffer
*
* Returns 0 on success, error otherwise.
* Returns number of bytes written or -err.
*/
int xb_write(const void *data, unsigned len)
static int xb_write(const void *data, unsigned int len)
{
struct xenstore_domain_interface *intf = xen_store_interface;
XENSTORE_RING_IDX cons, prod;
int rc;
unsigned int bytes = 0;
while (len != 0) {
void *dst;
unsigned int avail;
rc = wait_event_interruptible(
xb_waitq,
(intf->req_prod - intf->req_cons) !=
XENSTORE_RING_SIZE);
if (rc < 0)
return rc;
/* Read indexes, then verify. */
cons = intf->req_cons;
prod = intf->req_prod;
@ -115,6 +128,11 @@ int xb_write(const void *data, unsigned len)
intf->req_cons = intf->req_prod = 0;
return -EIO;
}
if (!xb_data_to_write())
return bytes;
/* Must write data /after/ reading the consumer index. */
virt_mb();
dst = get_output_chunk(cons, prod, intf->req, &avail);
if (avail == 0)
@ -122,52 +140,45 @@ int xb_write(const void *data, unsigned len)
if (avail > len)
avail = len;
/* Must write data /after/ reading the consumer index. */
virt_mb();
memcpy(dst, data, avail);
data += avail;
len -= avail;
bytes += avail;
/* Other side must not see new producer until data is there. */
virt_wmb();
intf->req_prod += avail;
/* Implies mb(): other side will see the updated producer. */
notify_remote_via_evtchn(xen_store_evtchn);
if (prod <= intf->req_cons)
notify_remote_via_evtchn(xen_store_evtchn);
}
return 0;
return bytes;
}
int xb_data_to_read(void)
static int xb_data_to_read(void)
{
struct xenstore_domain_interface *intf = xen_store_interface;
return (intf->rsp_cons != intf->rsp_prod);
}
int xb_wait_for_data_to_read(void)
{
return wait_event_interruptible(xb_waitq, xb_data_to_read());
}
int xb_read(void *data, unsigned len)
static int xb_read(void *data, unsigned int len)
{
struct xenstore_domain_interface *intf = xen_store_interface;
XENSTORE_RING_IDX cons, prod;
int rc;
unsigned int bytes = 0;
while (len != 0) {
unsigned int avail;
const char *src;
rc = xb_wait_for_data_to_read();
if (rc < 0)
return rc;
/* Read indexes, then verify. */
cons = intf->rsp_cons;
prod = intf->rsp_prod;
if (cons == prod)
return bytes;
if (!check_indexes(cons, prod)) {
intf->rsp_cons = intf->rsp_prod = 0;
return -EIO;
@ -185,17 +196,243 @@ int xb_read(void *data, unsigned len)
memcpy(data, src, avail);
data += avail;
len -= avail;
bytes += avail;
/* Other side must not see free space until we've copied out */
virt_mb();
intf->rsp_cons += avail;
pr_debug("Finished read of %i bytes (%i to go)\n", avail, len);
/* Implies mb(): other side will see the updated consumer. */
notify_remote_via_evtchn(xen_store_evtchn);
if (intf->rsp_prod - cons >= XENSTORE_RING_SIZE)
notify_remote_via_evtchn(xen_store_evtchn);
}
return bytes;
}
static int process_msg(void)
{
static struct {
struct xsd_sockmsg msg;
char *body;
union {
void *alloc;
struct xs_watch_event *watch;
};
bool in_msg;
bool in_hdr;
unsigned int read;
} state;
struct xb_req_data *req;
int err;
unsigned int len;
if (!state.in_msg) {
state.in_msg = true;
state.in_hdr = true;
state.read = 0;
/*
* We must disallow save/restore while reading a message.
* A partial read across s/r leaves us out of sync with
* xenstored.
* xs_response_mutex is locked as long as we are processing one
* message. state.in_msg will be true as long as we are holding
* the lock here.
*/
mutex_lock(&xs_response_mutex);
if (!xb_data_to_read()) {
/* We raced with save/restore: pending data 'gone'. */
mutex_unlock(&xs_response_mutex);
state.in_msg = false;
return 0;
}
}
if (state.in_hdr) {
if (state.read != sizeof(state.msg)) {
err = xb_read((void *)&state.msg + state.read,
sizeof(state.msg) - state.read);
if (err < 0)
goto out;
state.read += err;
if (state.read != sizeof(state.msg))
return 0;
if (state.msg.len > XENSTORE_PAYLOAD_MAX) {
err = -EINVAL;
goto out;
}
}
len = state.msg.len + 1;
if (state.msg.type == XS_WATCH_EVENT)
len += sizeof(*state.watch);
state.alloc = kmalloc(len, GFP_NOIO | __GFP_HIGH);
if (!state.alloc)
return -ENOMEM;
if (state.msg.type == XS_WATCH_EVENT)
state.body = state.watch->body;
else
state.body = state.alloc;
state.in_hdr = false;
state.read = 0;
}
err = xb_read(state.body + state.read, state.msg.len - state.read);
if (err < 0)
goto out;
state.read += err;
if (state.read != state.msg.len)
return 0;
state.body[state.msg.len] = '\0';
if (state.msg.type == XS_WATCH_EVENT) {
state.watch->len = state.msg.len;
err = xs_watch_msg(state.watch);
} else {
err = -ENOENT;
mutex_lock(&xb_write_mutex);
list_for_each_entry(req, &xs_reply_list, list) {
if (req->msg.req_id == state.msg.req_id) {
if (req->state == xb_req_state_wait_reply) {
req->msg.type = state.msg.type;
req->msg.len = state.msg.len;
req->body = state.body;
req->state = xb_req_state_got_reply;
list_del(&req->list);
req->cb(req);
} else {
list_del(&req->list);
kfree(req);
}
err = 0;
break;
}
}
mutex_unlock(&xb_write_mutex);
if (err)
goto out;
}
mutex_unlock(&xs_response_mutex);
state.in_msg = false;
state.alloc = NULL;
return err;
out:
mutex_unlock(&xs_response_mutex);
state.in_msg = false;
kfree(state.alloc);
state.alloc = NULL;
return err;
}
static int process_writes(void)
{
static struct {
struct xb_req_data *req;
int idx;
unsigned int written;
} state;
void *base;
unsigned int len;
int err = 0;
if (!xb_data_to_write())
return 0;
mutex_lock(&xb_write_mutex);
if (!state.req) {
state.req = list_first_entry(&xb_write_list,
struct xb_req_data, list);
state.idx = -1;
state.written = 0;
}
if (state.req->state == xb_req_state_aborted)
goto out_err;
while (state.idx < state.req->num_vecs) {
if (state.idx < 0) {
base = &state.req->msg;
len = sizeof(state.req->msg);
} else {
base = state.req->vec[state.idx].iov_base;
len = state.req->vec[state.idx].iov_len;
}
err = xb_write(base + state.written, len - state.written);
if (err < 0)
goto out_err;
state.written += err;
if (state.written != len)
goto out;
state.idx++;
state.written = 0;
}
list_del(&state.req->list);
state.req->state = xb_req_state_wait_reply;
list_add_tail(&state.req->list, &xs_reply_list);
state.req = NULL;
out:
mutex_unlock(&xb_write_mutex);
return 0;
out_err:
state.req->msg.type = XS_ERROR;
state.req->err = err;
list_del(&state.req->list);
if (state.req->state == xb_req_state_aborted)
kfree(state.req);
else {
state.req->state = xb_req_state_got_reply;
wake_up(&state.req->wq);
}
mutex_unlock(&xb_write_mutex);
state.req = NULL;
return err;
}
static int xb_thread_work(void)
{
return xb_data_to_read() || xb_data_to_write();
}
static int xenbus_thread(void *unused)
{
int err;
while (!kthread_should_stop()) {
if (wait_event_interruptible(xb_waitq, xb_thread_work()))
continue;
err = process_msg();
if (err == -ENOMEM)
schedule();
else if (err)
pr_warn_ratelimited("error %d while reading message\n",
err);
err = process_writes();
if (err)
pr_warn_ratelimited("error %d while writing message\n",
err);
}
xenbus_task = NULL;
return 0;
}
@ -223,6 +460,7 @@ int xb_init_comms(void)
rebind_evtchn_irq(xen_store_evtchn, xenbus_irq);
} else {
int err;
err = bind_evtchn_to_irqhandler(xen_store_evtchn, wake_waiting,
0, "xenbus", &xb_waitq);
if (err < 0) {
@ -231,6 +469,13 @@ int xb_init_comms(void)
}
xenbus_irq = err;
if (!xenbus_task) {
xenbus_task = kthread_run(xenbus_thread, NULL,
"xenbus");
if (IS_ERR(xenbus_task))
return PTR_ERR(xenbus_task);
}
}
return 0;

51
drivers/xen/xenbus/xenbus_comms.h
View File

@ -1,51 +0,0 @@
/*
* Private include for xenbus communications.
*
* Copyright (C) 2005 Rusty Russell, IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef _XENBUS_COMMS_H
#define _XENBUS_COMMS_H
#include <linux/fs.h>
int xs_init(void);
int xb_init_comms(void);
void xb_deinit_comms(void);
/* Low level routines. */
int xb_write(const void *data, unsigned len);
int xb_read(void *data, unsigned len);
int xb_data_to_read(void);
int xb_wait_for_data_to_read(void);
extern struct xenstore_domain_interface *xen_store_interface;
extern int xen_store_evtchn;
extern enum xenstore_init xen_store_domain_type;
extern const struct file_operations xen_xenbus_fops;
#endif /* _XENBUS_COMMS_H */

2
drivers/xen/xenbus/xenbus_dev_backend.c
View File

@ -16,7 +16,7 @@
#include <xen/events.h>
#include <asm/xen/hypervisor.h>
#include "xenbus_comms.h"
#include "xenbus.h"
static int xenbus_backend_open(struct inode *inode, struct file *filp)
{

213
drivers/xen/xenbus/xenbus_dev_frontend.c
View File

@ -57,12 +57,12 @@
#include <linux/miscdevice.h>
#include <linux/init.h>
#include "xenbus_comms.h"
#include <xen/xenbus.h>
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
#include "xenbus.h"
/*
* An element of a list of outstanding transactions, for which we're
* still waiting a reply.
@ -113,6 +113,7 @@ struct xenbus_file_priv {
struct list_head read_buffers;
wait_queue_head_t read_waitq;
struct kref kref;
};
/* Read out any raw xenbus messages queued up. */
@ -258,26 +259,23 @@ out_fail:
}
static void watch_fired(struct xenbus_watch *watch,
const char **vec,
unsigned int len)
const char *path,
const char *token)
{
struct watch_adapter *adap;
struct xsd_sockmsg hdr;
const char *path, *token;
int path_len, tok_len, body_len, data_len = 0;
const char *token_caller;
int path_len, tok_len, body_len;
int ret;
LIST_HEAD(staging_q);
adap = container_of(watch, struct watch_adapter, watch);
path = vec[XS_WATCH_PATH];
token = adap->token;
token_caller = adap->token;
path_len = strlen(path) + 1;
tok_len = strlen(token) + 1;
if (len > 2)
data_len = vec[len] - vec[2] + 1;
body_len = path_len + tok_len + data_len;
tok_len = strlen(token_caller) + 1;
body_len = path_len + tok_len;
hdr.type = XS_WATCH_EVENT;
hdr.len = body_len;
@ -288,9 +286,7 @@ static void watch_fired(struct xenbus_watch *watch,
if (!ret)
ret = queue_reply(&staging_q, path, path_len);
if (!ret)
ret = queue_reply(&staging_q, token, tok_len);
if (!ret && len > 2)
ret = queue_reply(&staging_q, vec[2], data_len);
ret = queue_reply(&staging_q, token_caller, tok_len);
if (!ret) {
/* success: pass reply list onto watcher */
@ -302,6 +298,107 @@ static void watch_fired(struct xenbus_watch *watch,
mutex_unlock(&adap->dev_data->reply_mutex);
}
static void xenbus_file_free(struct kref *kref)
{
struct xenbus_file_priv *u;
struct xenbus_transaction_holder *trans, *tmp;
struct watch_adapter *watch, *tmp_watch;
struct read_buffer *rb, *tmp_rb;
u = container_of(kref, struct xenbus_file_priv, kref);
/*
* No need for locking here because there are no other users,
* by definition.
*/
list_for_each_entry_safe(trans, tmp, &u->transactions, list) {
xenbus_transaction_end(trans->handle, 1);
list_del(&trans->list);
kfree(trans);
}
list_for_each_entry_safe(watch, tmp_watch, &u->watches, list) {
unregister_xenbus_watch(&watch->watch);
list_del(&watch->list);
free_watch_adapter(watch);
}
list_for_each_entry_safe(rb, tmp_rb, &u->read_buffers, list) {
list_del(&rb->list);
kfree(rb);
}
kfree(u);
}
static struct xenbus_transaction_holder *xenbus_get_transaction(
struct xenbus_file_priv *u, uint32_t tx_id)
{
struct xenbus_transaction_holder *trans;
list_for_each_entry(trans, &u->transactions, list)
if (trans->handle.id == tx_id)
return trans;
return NULL;
}
void xenbus_dev_queue_reply(struct xb_req_data *req)
{
struct xenbus_file_priv *u = req->par;
struct xenbus_transaction_holder *trans = NULL;
int rc;
LIST_HEAD(staging_q);
xs_request_exit(req);
mutex_lock(&u->msgbuffer_mutex);
if (req->type == XS_TRANSACTION_START) {
trans = xenbus_get_transaction(u, 0);
if (WARN_ON(!trans))
goto out;
if (req->msg.type == XS_ERROR) {
list_del(&trans->list);
kfree(trans);
} else {
rc = kstrtou32(req->body, 10, &trans->handle.id);
if (WARN_ON(rc))
goto out;
}
} else if (req->msg.type == XS_TRANSACTION_END) {
trans = xenbus_get_transaction(u, req->msg.tx_id);
if (WARN_ON(!trans))
goto out;
list_del(&trans->list);
kfree(trans);
}
mutex_unlock(&u->msgbuffer_mutex);
mutex_lock(&u->reply_mutex);
rc = queue_reply(&staging_q, &req->msg, sizeof(req->msg));
if (!rc)
rc = queue_reply(&staging_q, req->body, req->msg.len);
if (!rc) {
list_splice_tail(&staging_q, &u->read_buffers);
wake_up(&u->read_waitq);
} else {
queue_cleanup(&staging_q);
}
mutex_unlock(&u->reply_mutex);
kfree(req->body);
kfree(req);
kref_put(&u->kref, xenbus_file_free);
return;
out:
mutex_unlock(&u->msgbuffer_mutex);
}
static int xenbus_command_reply(struct xenbus_file_priv *u,
unsigned int msg_type, const char *reply)
{
@ -322,6 +419,9 @@ static int xenbus_command_reply(struct xenbus_file_priv *u,
wake_up(&u->read_waitq);
mutex_unlock(&u->reply_mutex);
if (!rc)
kref_put(&u->kref, xenbus_file_free);
return rc;
}
@ -329,57 +429,22 @@ static int xenbus_write_transaction(unsigned msg_type,
struct xenbus_file_priv *u)
{
int rc;
void *reply;
struct xenbus_transaction_holder *trans = NULL;
LIST_HEAD(staging_q);
if (msg_type == XS_TRANSACTION_START) {
trans = kmalloc(sizeof(*trans), GFP_KERNEL);
trans = kzalloc(sizeof(*trans), GFP_KERNEL);
if (!trans) {
rc = -ENOMEM;
goto out;
}
} else if (u->u.msg.tx_id != 0) {
list_for_each_entry(trans, &u->transactions, list)
if (trans->handle.id == u->u.msg.tx_id)
break;
if (&trans->list == &u->transactions)
return xenbus_command_reply(u, XS_ERROR, "ENOENT");
}
list_add(&trans->list, &u->transactions);
} else if (u->u.msg.tx_id != 0 &&
!xenbus_get_transaction(u, u->u.msg.tx_id))
return xenbus_command_reply(u, XS_ERROR, "ENOENT");
reply = xenbus_dev_request_and_reply(&u->u.msg);
if (IS_ERR(reply)) {
if (msg_type == XS_TRANSACTION_START)
kfree(trans);
rc = PTR_ERR(reply);
goto out;
}
if (msg_type == XS_TRANSACTION_START) {
if (u->u.msg.type == XS_ERROR)
kfree(trans);
else {
trans->handle.id = simple_strtoul(reply, NULL, 0);
list_add(&trans->list, &u->transactions);
}
} else if (u->u.msg.type == XS_TRANSACTION_END) {
list_del(&trans->list);
rc = xenbus_dev_request_and_reply(&u->u.msg, u);
if (rc)
kfree(trans);
}
mutex_lock(&u->reply_mutex);
rc = queue_reply(&staging_q, &u->u.msg, sizeof(u->u.msg));
if (!rc)
rc = queue_reply(&staging_q, reply, u->u.msg.len);
if (!rc) {
list_splice_tail(&staging_q, &u->read_buffers);
wake_up(&u->read_waitq);
} else {
queue_cleanup(&staging_q);
}
mutex_unlock(&u->reply_mutex);
kfree(reply);
out:
return rc;
@ -511,6 +576,8 @@ static ssize_t xenbus_file_write(struct file *filp,
* OK, now we have a complete message. Do something with it.
*/
kref_get(&u->kref);
msg_type = u->u.msg.type;
switch (msg_type) {
@ -525,8 +592,10 @@ static ssize_t xenbus_file_write(struct file *filp,
ret = xenbus_write_transaction(msg_type, u);
break;
}
if (ret != 0)
if (ret != 0) {
rc = ret;
kref_put(&u->kref, xenbus_file_free);
}
/* Buffered message consumed */
u->len = 0;
@ -551,6 +620,8 @@ static int xenbus_file_open(struct inode *inode, struct file *filp)
if (u == NULL)
return -ENOMEM;
kref_init(&u->kref);
INIT_LIST_HEAD(&u->transactions);
INIT_LIST_HEAD(&u->watches);
INIT_LIST_HEAD(&u->read_buffers);
@ -567,32 +638,8 @@ static int xenbus_file_open(struct inode *inode, struct file *filp)
static int xenbus_file_release(struct inode *inode, struct file *filp)
{
struct xenbus_file_priv *u = filp->private_data;
struct xenbus_transaction_holder *trans, *tmp;
struct watch_adapter *watch, *tmp_watch;
struct read_buffer *rb, *tmp_rb;
/*
* No need for locking here because there are no other users,
* by definition.
*/
list_for_each_entry_safe(trans, tmp, &u->transactions, list) {
xenbus_transaction_end(trans->handle, 1);
list_del(&trans->list);
kfree(trans);
}
list_for_each_entry_safe(watch, tmp_watch, &u->watches, list) {
unregister_xenbus_watch(&watch->watch);
list_del(&watch->list);
free_watch_adapter(watch);
}
list_for_each_entry_safe(rb, tmp_rb, &u->read_buffers, list) {
list_del(&rb->list);
kfree(rb);
}
kfree(u);
kref_put(&u->kref, xenbus_file_free);
return 0;
}

14
drivers/xen/xenbus/xenbus_probe.c
View File

@ -62,8 +62,7 @@
#include <xen/hvm.h>
#include "xenbus_comms.h"
#include "xenbus_probe.h"
#include "xenbus.h"
int xen_store_evtchn;
@ -170,7 +169,7 @@ int xenbus_read_otherend_details(struct xenbus_device *xendev,
EXPORT_SYMBOL_GPL(xenbus_read_otherend_details);
void xenbus_otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len,
const char *path, const char *token,
int ignore_on_shutdown)
{
struct xenbus_device *dev =
@ -181,18 +180,15 @@ void xenbus_otherend_changed(struct xenbus_watch *watch,
/* Protect us against watches firing on old details when the otherend
details change, say immediately after a resume. */
if (!dev->otherend ||
strncmp(dev->otherend, vec[XS_WATCH_PATH],
strlen(dev->otherend))) {
dev_dbg(&dev->dev, "Ignoring watch at %s\n",
vec[XS_WATCH_PATH]);
strncmp(dev->otherend, path, strlen(dev->otherend))) {
dev_dbg(&dev->dev, "Ignoring watch at %s\n", path);
return;
}
state = xenbus_read_driver_state(dev->otherend);
dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n",
state, xenbus_strstate(state), dev->otherend_watch.node,
vec[XS_WATCH_PATH]);
state, xenbus_strstate(state), dev->otherend_watch.node, path);
/*
* Ignore xenbus transitions during shutdown. This prevents us doing

88
drivers/xen/xenbus/xenbus_probe.h
View File

@ -1,88 +0,0 @@
/******************************************************************************
* xenbus_probe.h
*
* Talks to Xen Store to figure out what devices we have.
*
* Copyright (C) 2005 Rusty Russell, IBM Corporation
* Copyright (C) 2005 XenSource Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef _XENBUS_PROBE_H
#define _XENBUS_PROBE_H
#define XEN_BUS_ID_SIZE 20
struct xen_bus_type {
char *root;
unsigned int levels;
int (*get_bus_id)(char bus_id[XEN_BUS_ID_SIZE], const char *nodename);
int (*probe)(struct xen_bus_type *bus, const char *type,
const char *dir);
void (*otherend_changed)(struct xenbus_watch *watch, const char **vec,
unsigned int len);
struct bus_type bus;
};
enum xenstore_init {
XS_UNKNOWN,
XS_PV,
XS_HVM,
XS_LOCAL,
};
extern const struct attribute_group *xenbus_dev_groups[];
extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
extern int xenbus_dev_probe(struct device *_dev);
extern int xenbus_dev_remove(struct device *_dev);
extern int xenbus_register_driver_common(struct xenbus_driver *drv,
struct xen_bus_type *bus,
struct module *owner,
const char *mod_name);
extern int xenbus_probe_node(struct xen_bus_type *bus,
const char *type,
const char *nodename);
extern int xenbus_probe_devices(struct xen_bus_type *bus);
extern void xenbus_dev_changed(const char *node, struct xen_bus_type *bus);
extern void xenbus_dev_shutdown(struct device *_dev);
extern int xenbus_dev_suspend(struct device *dev);
extern int xenbus_dev_resume(struct device *dev);
extern int xenbus_dev_cancel(struct device *dev);
extern void xenbus_otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len,
int ignore_on_shutdown);
extern int xenbus_read_otherend_details(struct xenbus_device *xendev,
char *id_node, char *path_node);
void xenbus_ring_ops_init(void);
#endif

11
drivers/xen/xenbus/xenbus_probe_backend.c
View File

@ -53,8 +53,7 @@
#include <xen/xenbus.h>
#include <xen/features.h>
#include "xenbus_comms.h"
#include "xenbus_probe.h"
#include "xenbus.h"
/* backend/<type>/<fe-uuid>/<id> => <type>-<fe-domid>-<id> */
static int backend_bus_id(char bus_id[XEN_BUS_ID_SIZE], const char *nodename)
@ -182,9 +181,9 @@ static int xenbus_probe_backend(struct xen_bus_type *bus, const char *type,
}
static void frontend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
xenbus_otherend_changed(watch, vec, len, 0);
xenbus_otherend_changed(watch, path, token, 0);
}
static struct xen_bus_type xenbus_backend = {
@ -205,11 +204,11 @@ static struct xen_bus_type xenbus_backend = {
};
static void backend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
DPRINTK("");
xenbus_dev_changed(vec[XS_WATCH_PATH], &xenbus_backend);
xenbus_dev_changed(path, &xenbus_backend);
}
static struct xenbus_watch be_watch = {

17
drivers/xen/xenbus/xenbus_probe_frontend.c
View File

@ -27,8 +27,7 @@
#include <xen/platform_pci.h>
#include "xenbus_comms.h"
#include "xenbus_probe.h"
#include "xenbus.h"
@ -87,9 +86,9 @@ static int xenbus_uevent_frontend(struct device *_dev,
static void backend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
xenbus_otherend_changed(watch, vec, len, 1);
xenbus_otherend_changed(watch, path, token, 1);
}
static void xenbus_frontend_delayed_resume(struct work_struct *w)
@ -154,11 +153,11 @@ static struct xen_bus_type xenbus_frontend = {
};
static void frontend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
const char *path, const char *token)
{
DPRINTK("");
xenbus_dev_changed(vec[XS_WATCH_PATH], &xenbus_frontend);
xenbus_dev_changed(path, &xenbus_frontend);
}
@ -333,13 +332,13 @@ static DECLARE_WAIT_QUEUE_HEAD(backend_state_wq);
static int backend_state;
static void xenbus_reset_backend_state_changed(struct xenbus_watch *w,
const char **v, unsigned int l)
const char *path, const char *token)
{
if (xenbus_scanf(XBT_NIL, v[XS_WATCH_PATH], "", "%i",
if (xenbus_scanf(XBT_NIL, path, "", "%i",
&backend_state) != 1)
backend_state = XenbusStateUnknown;
printk(KERN_DEBUG "XENBUS: backend %s %s\n",
v[XS_WATCH_PATH], xenbus_strstate(backend_state));
path, xenbus_strstate(backend_state));
wake_up(&backend_state_wq);
}

538
drivers/xen/xenbus/xenbus_xs.c
View File

@ -43,69 +43,36 @@
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/kthread.h>
#include <linux/reboot.h>
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <asm/xen/hypervisor.h>
#include <xen/xenbus.h>
#include <xen/xen.h>
#include "xenbus_comms.h"
#include "xenbus_probe.h"
#include "xenbus.h"
struct xs_stored_msg {
struct list_head list;
/*
* Framework to protect suspend/resume handling against normal Xenstore
* message handling:
* During suspend/resume there must be no open transaction and no pending
* Xenstore request.
* New watch events happening in this time can be ignored by firing all watches
* after resume.
*/
struct xsd_sockmsg hdr;
/* Lock protecting enter/exit critical region. */
static DEFINE_SPINLOCK(xs_state_lock);
/* Number of users in critical region (protected by xs_state_lock). */
static unsigned int xs_state_users;
/* Suspend handler waiting or already active (protected by xs_state_lock)? */
static int xs_suspend_active;
/* Unique Xenstore request id (protected by xs_state_lock). */
static uint32_t xs_request_id;
union {
/* Queued replies. */
struct {
char *body;
} reply;
/* Queued watch events. */
struct {
struct xenbus_watch *handle;
char **vec;
unsigned int vec_size;
} watch;
} u;
};
struct xs_handle {
/* A list of replies. Currently only one will ever be outstanding. */
struct list_head reply_list;
spinlock_t reply_lock;
wait_queue_head_t reply_waitq;
/*
* Mutex ordering: transaction_mutex -> watch_mutex -> request_mutex.
* response_mutex is never taken simultaneously with the other three.
*
* transaction_mutex must be held before incrementing
* transaction_count. The mutex is held when a suspend is in
* progress to prevent new transactions starting.
*
* When decrementing transaction_count to zero the wait queue
* should be woken up, the suspend code waits for count to
* reach zero.
*/
/* One request at a time. */
struct mutex request_mutex;
/* Protect xenbus reader thread against save/restore. */
struct mutex response_mutex;
/* Protect transactions against save/restore. */
struct mutex transaction_mutex;
atomic_t transaction_count;
wait_queue_head_t transaction_wq;
/* Protect watch (de)register against save/restore. */
struct rw_semaphore watch_mutex;
};
static struct xs_handle xs_state;
/* Wait queue for all callers waiting for critical region to become usable. */
static DECLARE_WAIT_QUEUE_HEAD(xs_state_enter_wq);
/* Wait queue for suspend handling waiting for critical region being empty. */
static DECLARE_WAIT_QUEUE_HEAD(xs_state_exit_wq);
/* List of registered watches, and a lock to protect it. */
static LIST_HEAD(watches);
@ -115,6 +82,9 @@ static DEFINE_SPINLOCK(watches_lock);
static LIST_HEAD(watch_events);
static DEFINE_SPINLOCK(watch_events_lock);
/* Protect watch (de)register against save/restore. */
static DECLARE_RWSEM(xs_watch_rwsem);
/*
* Details of the xenwatch callback kernel thread. The thread waits on the
* watch_events_waitq for work to do (queued on watch_events list). When it
@ -125,6 +95,59 @@ static pid_t xenwatch_pid;
static DEFINE_MUTEX(xenwatch_mutex);
static DECLARE_WAIT_QUEUE_HEAD(watch_events_waitq);
static void xs_suspend_enter(void)
{
spin_lock(&xs_state_lock);
xs_suspend_active++;
spin_unlock(&xs_state_lock);
wait_event(xs_state_exit_wq, xs_state_users == 0);
}
static void xs_suspend_exit(void)
{
spin_lock(&xs_state_lock);
xs_suspend_active--;
spin_unlock(&xs_state_lock);
wake_up_all(&xs_state_enter_wq);
}
static uint32_t xs_request_enter(struct xb_req_data *req)
{
uint32_t rq_id;
req->type = req->msg.type;
spin_lock(&xs_state_lock);
while (!xs_state_users && xs_suspend_active) {
spin_unlock(&xs_state_lock);
wait_event(xs_state_enter_wq, xs_suspend_active == 0);
spin_lock(&xs_state_lock);
}
if (req->type == XS_TRANSACTION_START)
xs_state_users++;
xs_state_users++;
rq_id = xs_request_id++;
spin_unlock(&xs_state_lock);
return rq_id;
}
void xs_request_exit(struct xb_req_data *req)
{
spin_lock(&xs_state_lock);
xs_state_users--;
if ((req->type == XS_TRANSACTION_START && req->msg.type == XS_ERROR) ||
req->type == XS_TRANSACTION_END)
xs_state_users--;
spin_unlock(&xs_state_lock);
if (xs_suspend_active && !xs_state_users)
wake_up(&xs_state_exit_wq);
}
static int get_error(const char *errorstring)
{
unsigned int i;
@ -162,21 +185,24 @@ static bool xenbus_ok(void)
}
return false;
}
static void *read_reply(enum xsd_sockmsg_type *type, unsigned int *len)
static bool test_reply(struct xb_req_data *req)
{
struct xs_stored_msg *msg;
char *body;
if (req->state == xb_req_state_got_reply || !xenbus_ok())
return true;
spin_lock(&xs_state.reply_lock);
/* Make sure to reread req->state each time. */
barrier();
while (list_empty(&xs_state.reply_list)) {
spin_unlock(&xs_state.reply_lock);
if (xenbus_ok())
/* XXX FIXME: Avoid synchronous wait for response here. */
wait_event_timeout(xs_state.reply_waitq,
!list_empty(&xs_state.reply_list),
msecs_to_jiffies(500));
else {
return false;
}
static void *read_reply(struct xb_req_data *req)
{
while (req->state != xb_req_state_got_reply) {
wait_event(req->wq, test_reply(req));
if (!xenbus_ok())
/*
* If we are in the process of being shut-down there is
* no point of trying to contact XenBus - it is either
@ -184,77 +210,83 @@ static void *read_reply(enum xsd_sockmsg_type *type, unsigned int *len)
* has been killed or is unreachable.
*/
return ERR_PTR(-EIO);
}
spin_lock(&xs_state.reply_lock);
if (req->err)
return ERR_PTR(req->err);
}
msg = list_entry(xs_state.reply_list.next,
struct xs_stored_msg, list);
list_del(&msg->list);
spin_unlock(&xs_state.reply_lock);
*type = msg->hdr.type;
if (len)
*len = msg->hdr.len;
body = msg->u.reply.body;
kfree(msg);
return body;
return req->body;
}
static void transaction_start(void)
static void xs_send(struct xb_req_data *req, struct xsd_sockmsg *msg)
{
mutex_lock(&xs_state.transaction_mutex);
atomic_inc(&xs_state.transaction_count);
mutex_unlock(&xs_state.transaction_mutex);
bool notify;
req->msg = *msg;
req->err = 0;
req->state = xb_req_state_queued;
init_waitqueue_head(&req->wq);
req->msg.req_id = xs_request_enter(req);
mutex_lock(&xb_write_mutex);
list_add_tail(&req->list, &xb_write_list);
notify = list_is_singular(&xb_write_list);
mutex_unlock(&xb_write_mutex);
if (notify)
wake_up(&xb_waitq);
}
static void transaction_end(void)
{
if (atomic_dec_and_test(&xs_state.transaction_count))
wake_up(&xs_state.transaction_wq);
}
static void transaction_suspend(void)
{
mutex_lock(&xs_state.transaction_mutex);
wait_event(xs_state.transaction_wq,
atomic_read(&xs_state.transaction_count) == 0);
}
static void transaction_resume(void)
{
mutex_unlock(&xs_state.transaction_mutex);
}
void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg)
static void *xs_wait_for_reply(struct xb_req_data *req, struct xsd_sockmsg *msg)
{
void *ret;
enum xsd_sockmsg_type type = msg->type;
int err;
if (type == XS_TRANSACTION_START)
transaction_start();
ret = read_reply(req);
mutex_lock(&xs_state.request_mutex);
xs_request_exit(req);
err = xb_write(msg, sizeof(*msg) + msg->len);
if (err) {
msg->type = XS_ERROR;
ret = ERR_PTR(err);
} else
ret = read_reply(&msg->type, &msg->len);
msg->type = req->msg.type;
msg->len = req->msg.len;
mutex_unlock(&xs_state.request_mutex);
if ((msg->type == XS_TRANSACTION_END) ||
((type == XS_TRANSACTION_START) && (msg->type == XS_ERROR)))
transaction_end();
mutex_lock(&xb_write_mutex);
if (req->state == xb_req_state_queued ||
req->state == xb_req_state_wait_reply)
req->state = xb_req_state_aborted;
else
kfree(req);
mutex_unlock(&xb_write_mutex);
return ret;
}
static void xs_wake_up(struct xb_req_data *req)
{
wake_up(&req->wq);
}
int xenbus_dev_request_and_reply(struct xsd_sockmsg *msg, void *par)
{
struct xb_req_data *req;
struct kvec *vec;
req = kmalloc(sizeof(*req) + sizeof(*vec), GFP_KERNEL);
if (!req)
return -ENOMEM;
vec = (struct kvec *)(req + 1);
vec->iov_len = msg->len;
vec->iov_base = msg + 1;
req->vec = vec;
req->num_vecs = 1;
req->cb = xenbus_dev_queue_reply;
req->par = par;
xs_send(req, msg);
return 0;
}
EXPORT_SYMBOL(xenbus_dev_request_and_reply);
/* Send message to xs, get kmalloc'ed reply. ERR_PTR() on error. */
@ -264,37 +296,31 @@ static void *xs_talkv(struct xenbus_transaction t,
unsigned int num_vecs,
unsigned int *len)
{
struct xb_req_data *req;
struct xsd_sockmsg msg;
void *ret = NULL;
unsigned int i;
int err;
req = kmalloc(sizeof(*req), GFP_NOIO | __GFP_HIGH);
if (!req)
return ERR_PTR(-ENOMEM);
req->vec = iovec;
req->num_vecs = num_vecs;
req->cb = xs_wake_up;
msg.tx_id = t.id;
msg.req_id = 0;
msg.type = type;
msg.len = 0;
for (i = 0; i < num_vecs; i++)
msg.len += iovec[i].iov_len;
mutex_lock(&xs_state.request_mutex);
xs_send(req, &msg);
err = xb_write(&msg, sizeof(msg));
if (err) {
mutex_unlock(&xs_state.request_mutex);
return ERR_PTR(err);
}
for (i = 0; i < num_vecs; i++) {
err = xb_write(iovec[i].iov_base, iovec[i].iov_len);
if (err) {
mutex_unlock(&xs_state.request_mutex);
return ERR_PTR(err);
}
}
ret = read_reply(&msg.type, len);
mutex_unlock(&xs_state.request_mutex);
ret = xs_wait_for_reply(req, &msg);
if (len)
*len = msg.len;
if (IS_ERR(ret))
return ret;
@ -501,13 +527,9 @@ int xenbus_transaction_start(struct xenbus_transaction *t)
{
char *id_str;
transaction_start();
id_str = xs_single(XBT_NIL, XS_TRANSACTION_START, "", NULL);
if (IS_ERR(id_str)) {
transaction_end();
if (IS_ERR(id_str))
return PTR_ERR(id_str);
}
t->id = simple_strtoul(id_str, NULL, 0);
kfree(id_str);
@ -521,18 +543,13 @@ EXPORT_SYMBOL_GPL(xenbus_transaction_start);
int xenbus_transaction_end(struct xenbus_transaction t, int abort)
{
char abortstr[2];
int err;
if (abort)
strcpy(abortstr, "F");
else
strcpy(abortstr, "T");
err = xs_error(xs_single(t, XS_TRANSACTION_END, abortstr, NULL));
transaction_end();
return err;
return xs_error(xs_single(t, XS_TRANSACTION_END, abortstr, NULL));
}
EXPORT_SYMBOL_GPL(xenbus_transaction_end);
@ -665,6 +682,30 @@ static struct xenbus_watch *find_watch(const char *token)
return NULL;
}
int xs_watch_msg(struct xs_watch_event *event)
{
if (count_strings(event->body, event->len) != 2) {
kfree(event);
return -EINVAL;
}
event->path = (const char *)event->body;
event->token = (const char *)strchr(event->body, '\0') + 1;
spin_lock(&watches_lock);
event->handle = find_watch(event->token);
if (event->handle != NULL) {
spin_lock(&watch_events_lock);
list_add_tail(&event->list, &watch_events);
wake_up(&watch_events_waitq);
spin_unlock(&watch_events_lock);
} else
kfree(event);
spin_unlock(&watches_lock);
return 0;
}
/*
* Certain older XenBus toolstack cannot handle reading values that are
* not populated. Some Xen 3.4 installation are incapable of doing this
@ -713,7 +754,7 @@ int register_xenbus_watch(struct xenbus_watch *watch)
sprintf(token, "%lX", (long)watch);
down_read(&xs_state.watch_mutex);
down_read(&xs_watch_rwsem);
spin_lock(&watches_lock);
BUG_ON(find_watch(token));
@ -728,7 +769,7 @@ int register_xenbus_watch(struct xenbus_watch *watch)
spin_unlock(&watches_lock);
}
up_read(&xs_state.watch_mutex);
up_read(&xs_watch_rwsem);
return err;
}
@ -736,13 +777,13 @@ EXPORT_SYMBOL_GPL(register_xenbus_watch);
void unregister_xenbus_watch(struct xenbus_watch *watch)
{
struct xs_stored_msg *msg, *tmp;
struct xs_watch_event *event, *tmp;
char token[sizeof(watch) * 2 + 1];
int err;
sprintf(token, "%lX", (long)watch);
down_read(&xs_state.watch_mutex);
down_read(&xs_watch_rwsem);
spin_lock(&watches_lock);
BUG_ON(!find_watch(token));
@ -753,7 +794,7 @@ void unregister_xenbus_watch(struct xenbus_watch *watch)
if (err)
pr_warn("Failed to release watch %s: %i\n", watch->node, err);
up_read(&xs_state.watch_mutex);
up_read(&xs_watch_rwsem);
/* Make sure there are no callbacks running currently (unless
its us) */
@ -762,12 +803,11 @@ void unregister_xenbus_watch(struct xenbus_watch *watch)
/* Cancel pending watch events. */
spin_lock(&watch_events_lock);
list_for_each_entry_safe(msg, tmp, &watch_events, list) {
if (msg->u.watch.handle != watch)
list_for_each_entry_safe(event, tmp, &watch_events, list) {
if (event->handle != watch)
continue;
list_del(&msg->list);
kfree(msg->u.watch.vec);
kfree(msg);
list_del(&event->list);
kfree(event);
}
spin_unlock(&watch_events_lock);
@ -778,10 +818,10 @@ EXPORT_SYMBOL_GPL(unregister_xenbus_watch);
void xs_suspend(void)
{
transaction_suspend();
down_write(&xs_state.watch_mutex);
mutex_lock(&xs_state.request_mutex);
mutex_lock(&xs_state.response_mutex);
xs_suspend_enter();
down_write(&xs_watch_rwsem);
mutex_lock(&xs_response_mutex);
}
void xs_resume(void)
@ -791,31 +831,31 @@ void xs_resume(void)
xb_init_comms();
mutex_unlock(&xs_state.response_mutex);
mutex_unlock(&xs_state.request_mutex);
transaction_resume();
mutex_unlock(&xs_response_mutex);
/* No need for watches_lock: the watch_mutex is sufficient. */
xs_suspend_exit();
/* No need for watches_lock: the xs_watch_rwsem is sufficient. */
list_for_each_entry(watch, &watches, list) {
sprintf(token, "%lX", (long)watch);
xs_watch(watch->node, token);
}
up_write(&xs_state.watch_mutex);
up_write(&xs_watch_rwsem);
}
void xs_suspend_cancel(void)
{
mutex_unlock(&xs_state.response_mutex);
mutex_unlock(&xs_state.request_mutex);
up_write(&xs_state.watch_mutex);
mutex_unlock(&xs_state.transaction_mutex);
mutex_unlock(&xs_response_mutex);
up_write(&xs_watch_rwsem);
xs_suspend_exit();
}
static int xenwatch_thread(void *unused)
{
struct list_head *ent;
struct xs_stored_msg *msg;
struct xs_watch_event *event;
for (;;) {
wait_event_interruptible(watch_events_waitq,
@ -833,13 +873,10 @@ static int xenwatch_thread(void *unused)
spin_unlock(&watch_events_lock);
if (ent != &watch_events) {
msg = list_entry(ent, struct xs_stored_msg, list);
msg->u.watch.handle->callback(
msg->u.watch.handle,
(const char **)msg->u.watch.vec,
msg->u.watch.vec_size);
kfree(msg->u.watch.vec);
kfree(msg);
event = list_entry(ent, struct xs_watch_event, list);
event->handle->callback(event->handle, event->path,
event->token);
kfree(event);
}
mutex_unlock(&xenwatch_mutex);
@ -848,126 +885,37 @@ static int xenwatch_thread(void *unused)
return 0;
}
static int process_msg(void)
/*
* Wake up all threads waiting for a xenstore reply. In case of shutdown all
* pending replies will be marked as "aborted" in order to let the waiters
* return in spite of xenstore possibly no longer being able to reply. This
* will avoid blocking shutdown by a thread waiting for xenstore but being
* necessary for shutdown processing to proceed.
*/
static int xs_reboot_notify(struct notifier_block *nb,
unsigned long code, void *unused)
{
struct xs_stored_msg *msg;
char *body;
int err;
struct xb_req_data *req;
/*
* We must disallow save/restore while reading a xenstore message.
* A partial read across s/r leaves us out of sync with xenstored.
*/
for (;;) {
err = xb_wait_for_data_to_read();
if (err)
return err;
mutex_lock(&xs_state.response_mutex);
if (xb_data_to_read())
break;
/* We raced with save/restore: pending data 'disappeared'. */
mutex_unlock(&xs_state.response_mutex);
}
msg = kmalloc(sizeof(*msg), GFP_NOIO | __GFP_HIGH);
if (msg == NULL) {
err = -ENOMEM;
goto out;
}
err = xb_read(&msg->hdr, sizeof(msg->hdr));
if (err) {
kfree(msg);
goto out;
}
if (msg->hdr.len > XENSTORE_PAYLOAD_MAX) {
kfree(msg);
err = -EINVAL;
goto out;
}
body = kmalloc(msg->hdr.len + 1, GFP_NOIO | __GFP_HIGH);
if (body == NULL) {
kfree(msg);
err = -ENOMEM;
goto out;
}
err = xb_read(body, msg->hdr.len);
if (err) {
kfree(body);
kfree(msg);
goto out;
}
body[msg->hdr.len] = '\0';
if (msg->hdr.type == XS_WATCH_EVENT) {
msg->u.watch.vec = split(body, msg->hdr.len,
&msg->u.watch.vec_size);
if (IS_ERR(msg->u.watch.vec)) {
err = PTR_ERR(msg->u.watch.vec);
kfree(msg);
goto out;
}
spin_lock(&watches_lock);
msg->u.watch.handle = find_watch(
msg->u.watch.vec[XS_WATCH_TOKEN]);
if (msg->u.watch.handle != NULL) {
spin_lock(&watch_events_lock);
list_add_tail(&msg->list, &watch_events);
wake_up(&watch_events_waitq);
spin_unlock(&watch_events_lock);
} else {
kfree(msg->u.watch.vec);
kfree(msg);
}
spin_unlock(&watches_lock);
} else {
msg->u.reply.body = body;
spin_lock(&xs_state.reply_lock);
list_add_tail(&msg->list, &xs_state.reply_list);
spin_unlock(&xs_state.reply_lock);
wake_up(&xs_state.reply_waitq);
}
out:
mutex_unlock(&xs_state.response_mutex);
return err;
mutex_lock(&xb_write_mutex);
list_for_each_entry(req, &xs_reply_list, list)
wake_up(&req->wq);
list_for_each_entry(req, &xb_write_list, list)
wake_up(&req->wq);
mutex_unlock(&xb_write_mutex);
return NOTIFY_DONE;
}
static int xenbus_thread(void *unused)
{
int err;
for (;;) {
err = process_msg();
if (err)
pr_warn("error %d while reading message\n", err);
if (kthread_should_stop())
break;
}
return 0;
}
static struct notifier_block xs_reboot_nb = {
.notifier_call = xs_reboot_notify,
};
int xs_init(void)
{
int err;
struct task_struct *task;
INIT_LIST_HEAD(&xs_state.reply_list);
spin_lock_init(&xs_state.reply_lock);
init_waitqueue_head(&xs_state.reply_waitq);
mutex_init(&xs_state.request_mutex);
mutex_init(&xs_state.response_mutex);
mutex_init(&xs_state.transaction_mutex);
init_rwsem(&xs_state.watch_mutex);
atomic_set(&xs_state.transaction_count, 0);
init_waitqueue_head(&xs_state.transaction_wq);
register_reboot_notifier(&xs_reboot_nb);
/* Initialize the shared memory rings to talk to xenstored */
err = xb_init_comms();
@ -979,10 +927,6 @@ int xs_init(void)
return PTR_ERR(task);
xenwatch_pid = task->pid;
task = kthread_run(xenbus_thread, NULL, "xenbus");
if (IS_ERR(task))
return PTR_ERR(task);
/* shutdown watches for kexec boot */
xs_reset_watches();

2
drivers/xen/xenfs/super.c
View File

@ -16,10 +16,10 @@
#include <linux/magic.h>
#include <xen/xen.h>
#include <xen/xenbus.h>
#include "xenfs.h"
#include "../privcmd.h"
#include "../xenbus/xenbus_comms.h"
#include <asm/xen/hypervisor.h>

2
drivers/xen/xenfs/xenstored.c
View File

@ -4,9 +4,9 @@
#include <linux/fs.h>
#include <xen/page.h>
#include <xen/xenbus.h>
#include "xenfs.h"
#include "../xenbus/xenbus_comms.h"
static ssize_t xsd_read(struct file *file, char __user *buf,
size_t size, loff_t *off)

15
include/uapi/xen/privcmd.h
View File

@ -77,6 +77,17 @@ struct privcmd_mmapbatch_v2 {
int __user *err; /* array of error codes */
};
struct privcmd_dm_op_buf {
void __user *uptr;
size_t size;
};
struct privcmd_dm_op {
domid_t dom;
__u16 num;
const struct privcmd_dm_op_buf __user *ubufs;
};
/*
* @cmd: IOCTL_PRIVCMD_HYPERCALL
* @arg: &privcmd_hypercall_t
@ -98,5 +109,9 @@ struct privcmd_mmapbatch_v2 {
_IOC(_IOC_NONE, 'P', 3, sizeof(struct privcmd_mmapbatch))
#define IOCTL_PRIVCMD_MMAPBATCH_V2 \
_IOC(_IOC_NONE, 'P', 4, sizeof(struct privcmd_mmapbatch_v2))
#define IOCTL_PRIVCMD_DM_OP \
_IOC(_IOC_NONE, 'P', 5, sizeof(struct privcmd_dm_op))
#define IOCTL_PRIVCMD_RESTRICT \
_IOC(_IOC_NONE, 'P', 6, sizeof(domid_t))
#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */

1
include/xen/arm/hypercall.h
View File

@ -53,6 +53,7 @@ int HYPERVISOR_physdev_op(int cmd, void *arg);
int HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args);
int HYPERVISOR_tmem_op(void *arg);
int HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type);
int HYPERVISOR_dm_op(domid_t domid, unsigned int nr_bufs, void *bufs);
int HYPERVISOR_platform_op_raw(void *arg);
static inline int HYPERVISOR_platform_op(struct xen_platform_op *op)
{

12
include/xen/interface/elfnote.h
View File

@ -192,10 +192,20 @@
*/
#define XEN_ELFNOTE_SUPPORTED_FEATURES 17
/*
* Physical entry point into the kernel.
*
* 32bit entry point into the kernel. When requested to launch the
* guest kernel in a HVM container, Xen will use this entry point to
* launch the guest in 32bit protected mode with paging disabled.
* Ignored otherwise.
*/
#define XEN_ELFNOTE_PHYS32_ENTRY 18
/*
* The number of the highest elfnote defined.
*/
#define XEN_ELFNOTE_MAX XEN_ELFNOTE_SUPPORTED_FEATURES
#define XEN_ELFNOTE_MAX XEN_ELFNOTE_PHYS32_ENTRY
#endif /* __XEN_PUBLIC_ELFNOTE_H__ */

32
include/xen/interface/hvm/dm_op.h 100644
View File

@ -0,0 +1,32 @@
/*
* Copyright (c) 2016, Citrix Systems Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef __XEN_PUBLIC_HVM_DM_OP_H__
#define __XEN_PUBLIC_HVM_DM_OP_H__
struct xen_dm_op_buf {
GUEST_HANDLE(void) h;
xen_ulong_t size;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_dm_op_buf);
#endif /* __XEN_PUBLIC_HVM_DM_OP_H__ */

143
include/xen/interface/hvm/hvm_vcpu.h 100644
View File

@ -0,0 +1,143 @@
/*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright (c) 2015, Roger Pau Monne <roger.pau@citrix.com>
*/
#ifndef __XEN_PUBLIC_HVM_HVM_VCPU_H__
#define __XEN_PUBLIC_HVM_HVM_VCPU_H__
#include "../xen.h"
struct vcpu_hvm_x86_32 {
uint32_t eax;
uint32_t ecx;
uint32_t edx;
uint32_t ebx;
uint32_t esp;
uint32_t ebp;
uint32_t esi;
uint32_t edi;
uint32_t eip;
uint32_t eflags;
uint32_t cr0;
uint32_t cr3;
uint32_t cr4;
uint32_t pad1;
/*
* EFER should only be used to set the NXE bit (if required)
* when starting a vCPU in 32bit mode with paging enabled or
* to set the LME/LMA bits in order to start the vCPU in
* compatibility mode.
*/
uint64_t efer;
uint32_t cs_base;
uint32_t ds_base;
uint32_t ss_base;
uint32_t es_base;
uint32_t tr_base;
uint32_t cs_limit;
uint32_t ds_limit;
uint32_t ss_limit;
uint32_t es_limit;
uint32_t tr_limit;
uint16_t cs_ar;
uint16_t ds_ar;
uint16_t ss_ar;
uint16_t es_ar;
uint16_t tr_ar;
uint16_t pad2[3];
};
/*
* The layout of the _ar fields of the segment registers is the
* following:
*
* Bits [0,3]: type (bits 40-43).
* Bit 4: s (descriptor type, bit 44).
* Bit [5,6]: dpl (descriptor privilege level, bits 45-46).
* Bit 7: p (segment-present, bit 47).
* Bit 8: avl (available for system software, bit 52).
* Bit 9: l (64-bit code segment, bit 53).
* Bit 10: db (meaning depends on the segment, bit 54).
* Bit 11: g (granularity, bit 55)
* Bits [12,15]: unused, must be blank.
*
* A more complete description of the meaning of this fields can be
* obtained from the Intel SDM, Volume 3, section 3.4.5.
*/
struct vcpu_hvm_x86_64 {
uint64_t rax;
uint64_t rcx;
uint64_t rdx;
uint64_t rbx;
uint64_t rsp;
uint64_t rbp;
uint64_t rsi;
uint64_t rdi;
uint64_t rip;
uint64_t rflags;
uint64_t cr0;
uint64_t cr3;
uint64_t cr4;
uint64_t efer;
/*
* Using VCPU_HVM_MODE_64B implies that the vCPU is launched
* directly in long mode, so the cached parts of the segment
* registers get set to match that environment.
*
* If the user wants to launch the vCPU in compatibility mode
* the 32-bit structure should be used instead.
*/
};
struct vcpu_hvm_context {
#define VCPU_HVM_MODE_32B 0 /* 32bit fields of the structure will be used. */
#define VCPU_HVM_MODE_64B 1 /* 64bit fields of the structure will be used. */
uint32_t mode;
uint32_t pad;
/* CPU registers. */
union {
struct vcpu_hvm_x86_32 x86_32;
struct vcpu_hvm_x86_64 x86_64;
} cpu_regs;
};
typedef struct vcpu_hvm_context vcpu_hvm_context_t;
#endif /* __XEN_PUBLIC_HVM_HVM_VCPU_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/

98
include/xen/interface/hvm/start_info.h 100644
View File

@ -0,0 +1,98 @@
/*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright (c) 2016, Citrix Systems, Inc.
*/
#ifndef __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__
#define __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__
/*
* Start of day structure passed to PVH guests and to HVM guests in %ebx.
*
* NOTE: nothing will be loaded at physical address 0, so a 0 value in any
* of the address fields should be treated as not present.
*
* 0 +----------------+
* | magic | Contains the magic value XEN_HVM_START_MAGIC_VALUE
* | | ("xEn3" with the 0x80 bit of the "E" set).
* 4 +----------------+
* | version | Version of this structure. Current version is 0. New
* | | versions are guaranteed to be backwards-compatible.
* 8 +----------------+
* | flags | SIF_xxx flags.
* 12 +----------------+
* | nr_modules | Number of modules passed to the kernel.
* 16 +----------------+
* | modlist_paddr | Physical address of an array of modules
* | | (layout of the structure below).
* 24 +----------------+
* | cmdline_paddr | Physical address of the command line,
* | | a zero-terminated ASCII string.
* 32 +----------------+
* | rsdp_paddr | Physical address of the RSDP ACPI data structure.
* 40 +----------------+
*
* The layout of each entry in the module structure is the following:
*
* 0 +----------------+
* | paddr | Physical address of the module.
* 8 +----------------+
* | size | Size of the module in bytes.
* 16 +----------------+
* | cmdline_paddr | Physical address of the command line,
* | | a zero-terminated ASCII string.
* 24 +----------------+
* | reserved |
* 32 +----------------+
*
* The address and sizes are always a 64bit little endian unsigned integer.
*
* NB: Xen on x86 will always try to place all the data below the 4GiB
* boundary.
*/
#define XEN_HVM_START_MAGIC_VALUE 0x336ec578
/*
* C representation of the x86/HVM start info layout.
*
* The canonical definition of this layout is above, this is just a way to
* represent the layout described there using C types.
*/
struct hvm_start_info {
uint32_t magic; /* Contains the magic value 0x336ec578 */
/* ("xEn3" with the 0x80 bit of the "E" set).*/
uint32_t version; /* Version of this structure. */
uint32_t flags; /* SIF_xxx flags. */
uint32_t nr_modules; /* Number of modules passed to the kernel. */
uint64_t modlist_paddr; /* Physical address of an array of */
/* hvm_modlist_entry. */
uint64_t cmdline_paddr; /* Physical address of the command line. */
uint64_t rsdp_paddr; /* Physical address of the RSDP ACPI data */
/* structure. */
};
struct hvm_modlist_entry {
uint64_t paddr; /* Physical address of the module. */
uint64_t size; /* Size of the module in bytes. */
uint64_t cmdline_paddr; /* Physical address of the command line. */
uint64_t reserved;
};
#endif /* __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__ */

1
include/xen/interface/xen.h
View File

@ -81,6 +81,7 @@
#define __HYPERVISOR_tmem_op 38
#define __HYPERVISOR_xc_reserved_op 39 /* reserved for XenClient */
#define __HYPERVISOR_xenpmu_op 40
#define __HYPERVISOR_dm_op 41
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48

12
include/xen/xen.h
View File

@ -30,16 +30,10 @@ extern enum xen_domain_type xen_domain_type;
#endif /* CONFIG_XEN_DOM0 */
#ifdef CONFIG_XEN_PVH
/* This functionality exists only for x86. The XEN_PVHVM support exists
* only in x86 world - hence on ARM it will be always disabled.
* N.B. ARM guests are neither PV nor HVM nor PVHVM.
* It's a bit like PVH but is different also (it's further towards the H
* end of the spectrum than even PVH).
*/
#include <xen/features.h>
#define xen_pvh_domain() (xen_pv_domain() && \
xen_feature(XENFEAT_auto_translated_physmap))
extern bool xen_pvh;
#define xen_pvh_domain() (xen_hvm_domain() && xen_pvh)
#else
#define xen_pvh_domain() (0)
#endif
#endif /* _XEN_XEN_H */

18
include/xen/xenbus.h
View File

@ -38,6 +38,7 @@
#include <linux/notifier.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/completion.h>
#include <linux/init.h>
#include <linux/slab.h>
@ -60,7 +61,7 @@ struct xenbus_watch
/* Callback (executed in a process context with no locks held). */
void (*callback)(struct xenbus_watch *,
const char **vec, unsigned int len);
const char *path, const char *token);
};
@ -175,16 +176,9 @@ void xs_suspend(void);
void xs_resume(void);
void xs_suspend_cancel(void);
/* Used by xenbus_dev to borrow kernel's store connection. */
void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg);
struct work_struct;
/* Prepare for domain suspend: then resume or cancel the suspend. */
void xenbus_suspend(void);
void xenbus_resume(void);
void xenbus_probe(struct work_struct *);
void xenbus_suspend_cancel(void);
#define XENBUS_IS_ERR_READ(str) ({ \
if (!IS_ERR(str) && strlen(str) == 0) { \
@ -199,11 +193,11 @@ void xenbus_suspend_cancel(void);
int xenbus_watch_path(struct xenbus_device *dev, const char *path,
struct xenbus_watch *watch,
void (*callback)(struct xenbus_watch *,
const char **, unsigned int));
const char *, const char *));
__printf(4, 5)
int xenbus_watch_pathfmt(struct xenbus_device *dev, struct xenbus_watch *watch,
void (*callback)(struct xenbus_watch *,
const char **, unsigned int),
const char *, const char *),
const char *pathfmt, ...);
int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_state);
@ -235,4 +229,8 @@ const char *xenbus_strstate(enum xenbus_state state);
int xenbus_dev_is_online(struct xenbus_device *dev);
int xenbus_frontend_closed(struct xenbus_device *dev);
extern const struct file_operations xen_xenbus_fops;
extern struct xenstore_domain_interface *xen_store_interface;
extern int xen_store_evtchn;
#endif /* _XEN_XENBUS_H */