arm: initial Xen support
- Basic hypervisor.h and interface.h definitions. - Skeleton enlighten.c, set xen_start_info to an empty struct. - Make xen_initial_domain dependent on the SIF_PRIVILIGED_BIT. The new code only compiles when CONFIG_XEN is set, that is going to be added to arch/arm/Kconfig in patch #11 "xen/arm: introduce CONFIG_XEN on ARM". Changes in v3: - improve comments. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -251,6 +251,7 @@ endif
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core-$(CONFIG_FPE_NWFPE) += arch/arm/nwfpe/
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core-$(CONFIG_FPE_NWFPE) += arch/arm/nwfpe/
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core-$(CONFIG_FPE_FASTFPE) += $(FASTFPE_OBJ)
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core-$(CONFIG_FPE_FASTFPE) += $(FASTFPE_OBJ)
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core-$(CONFIG_VFP) += arch/arm/vfp/
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core-$(CONFIG_VFP) += arch/arm/vfp/
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core-$(CONFIG_XEN) += arch/arm/xen/
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# If we have a machine-specific directory, then include it in the build.
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# If we have a machine-specific directory, then include it in the build.
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core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/
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core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/
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6
arch/arm/include/asm/hypervisor.h
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arch/arm/include/asm/hypervisor.h
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@ -0,0 +1,6 @@
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#ifndef _ASM_ARM_HYPERVISOR_H
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#define _ASM_ARM_HYPERVISOR_H
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#include <asm/xen/hypervisor.h>
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#endif
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arch/arm/include/asm/xen/hypervisor.h
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arch/arm/include/asm/xen/hypervisor.h
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#ifndef _ASM_ARM_XEN_HYPERVISOR_H
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#define _ASM_ARM_XEN_HYPERVISOR_H
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extern struct shared_info *HYPERVISOR_shared_info;
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extern struct start_info *xen_start_info;
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/* Lazy mode for batching updates / context switch */
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enum paravirt_lazy_mode {
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PARAVIRT_LAZY_NONE,
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PARAVIRT_LAZY_MMU,
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PARAVIRT_LAZY_CPU,
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};
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static inline enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
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{
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return PARAVIRT_LAZY_NONE;
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}
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#endif /* _ASM_ARM_XEN_HYPERVISOR_H */
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arch/arm/include/asm/xen/interface.h
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arch/arm/include/asm/xen/interface.h
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@ -0,0 +1,69 @@
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/******************************************************************************
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* Guest OS interface to ARM Xen.
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*
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* Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
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*/
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#ifndef _ASM_ARM_XEN_INTERFACE_H
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#define _ASM_ARM_XEN_INTERFACE_H
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#include <linux/types.h>
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#define __DEFINE_GUEST_HANDLE(name, type) \
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typedef type * __guest_handle_ ## name
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#define DEFINE_GUEST_HANDLE_STRUCT(name) \
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__DEFINE_GUEST_HANDLE(name, struct name)
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#define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name)
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#define GUEST_HANDLE(name) __guest_handle_ ## name
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#define set_xen_guest_handle(hnd, val) \
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do { \
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if (sizeof(hnd) == 8) \
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*(uint64_t *)&(hnd) = 0; \
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(hnd) = val; \
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} while (0)
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#ifndef __ASSEMBLY__
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/* Explicitly size integers that represent pfns in the interface with
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* Xen so that we can have one ABI that works for 32 and 64 bit guests. */
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typedef uint64_t xen_pfn_t;
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/* Guest handles for primitive C types. */
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__DEFINE_GUEST_HANDLE(uchar, unsigned char);
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__DEFINE_GUEST_HANDLE(uint, unsigned int);
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__DEFINE_GUEST_HANDLE(ulong, unsigned long);
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DEFINE_GUEST_HANDLE(char);
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DEFINE_GUEST_HANDLE(int);
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DEFINE_GUEST_HANDLE(long);
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DEFINE_GUEST_HANDLE(void);
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DEFINE_GUEST_HANDLE(uint64_t);
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DEFINE_GUEST_HANDLE(uint32_t);
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DEFINE_GUEST_HANDLE(xen_pfn_t);
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/* Maximum number of virtual CPUs in multi-processor guests. */
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#define MAX_VIRT_CPUS 1
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struct arch_vcpu_info { };
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struct arch_shared_info { };
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/* TODO: Move pvclock definitions some place arch independent */
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struct pvclock_vcpu_time_info {
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u32 version;
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u32 pad0;
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u64 tsc_timestamp;
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u64 system_time;
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u32 tsc_to_system_mul;
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s8 tsc_shift;
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u8 flags;
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u8 pad[2];
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} __attribute__((__packed__)); /* 32 bytes */
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/* It is OK to have a 12 bytes struct with no padding because it is packed */
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struct pvclock_wall_clock {
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u32 version;
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u32 sec;
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u32 nsec;
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} __attribute__((__packed__));
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#endif
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#endif /* _ASM_ARM_XEN_INTERFACE_H */
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1
arch/arm/xen/Makefile
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1
arch/arm/xen/Makefile
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@ -0,0 +1 @@
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obj-y := enlighten.o
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35
arch/arm/xen/enlighten.c
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arch/arm/xen/enlighten.c
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#include <xen/xen.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/memory.h>
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#include <xen/platform_pci.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include <linux/module.h>
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struct start_info _xen_start_info;
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struct start_info *xen_start_info = &_xen_start_info;
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EXPORT_SYMBOL_GPL(xen_start_info);
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enum xen_domain_type xen_domain_type = XEN_NATIVE;
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EXPORT_SYMBOL_GPL(xen_domain_type);
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struct shared_info xen_dummy_shared_info;
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struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
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DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
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/* TODO: to be removed */
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__read_mostly int xen_have_vector_callback;
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EXPORT_SYMBOL_GPL(xen_have_vector_callback);
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int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
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EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
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int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
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unsigned long addr,
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unsigned long mfn, int nr,
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pgprot_t prot, unsigned domid)
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{
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
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@ -23,7 +23,7 @@ extern enum xen_domain_type xen_domain_type;
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#include <xen/interface/xen.h>
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#include <xen/interface/xen.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypervisor.h>
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#define xen_initial_domain() (xen_pv_domain() && \
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#define xen_initial_domain() (xen_domain() && \
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xen_start_info->flags & SIF_INITDOMAIN)
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xen_start_info->flags & SIF_INITDOMAIN)
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#else /* !CONFIG_XEN_DOM0 */
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#else /* !CONFIG_XEN_DOM0 */
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#define xen_initial_domain() (0)
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#define xen_initial_domain() (0)
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