![Linus Torvalds](/assets/img/avatar_default.png)
* one is a workaround that will be removed in v3.5 with proper fix in the tip/x86 tree, * the other is to fix drivers to load on PV (a previous patch made them only load in PVonHVM mode). The rest are just minor fixes in the various drivers and some cleanup in the core code. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQEcBAABAgAGBQJPfyVUAAoJEFjIrFwIi8fJUjUH/jbY5JavRqSlNELZW2A4Ta76 8p00LqLHw/C56iHZcWKke8mqtWNb+ZfcQt7ZYcxDIYa4QWBL28x0OLAO2tOBIt37 ZjYESWSdFJaJvmpADluWtFyGyZ9TYJllDTBm/jWj1ZtKSZvR1YkhuMXCS0f4AmGQ xFzSWJZUDdiOAqpN+VQD8wP00gfR8knQLg16XE2fvFdQo4XwpCtqLfHV/5pMMGdy Cs/ep6rq/7cdv/nshKOcBnw7RW8l3Xoi/28ht8k3DvAQ2VtFq1Tugv2G9pcCHwQG DIBkB3SOU6/v6P5at5+egKS5xR1fJetCWlkMd8kkbcdz2NPI4UDMkvOW6Q8yQls= =6Ve+ -----END PGP SIGNATURE----- Merge tag 'stable/for-linus-3.4-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen Pull xen fixes from Konrad Rzeszutek Wilk: "Two fixes for regressions: * one is a workaround that will be removed in v3.5 with proper fix in the tip/x86 tree, * the other is to fix drivers to load on PV (a previous patch made them only load in PVonHVM mode). The rest are just minor fixes in the various drivers and some cleanup in the core code." * tag 'stable/for-linus-3.4-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/pcifront: avoid pci_frontend_enable_msix() falsely returning success xen/pciback: fix XEN_PCI_OP_enable_msix result xen/smp: Remove unnecessary call to smp_processor_id() xen/x86: Workaround 'x86/ioapic: Add register level checks to detect bogus io-apic entries' xen: only check xen_platform_pci_unplug if hvm
578 lines
13 KiB
C
578 lines
13 KiB
C
/*
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* Xen SMP support
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*
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* This file implements the Xen versions of smp_ops. SMP under Xen is
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* very straightforward. Bringing a CPU up is simply a matter of
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* loading its initial context and setting it running.
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*
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* IPIs are handled through the Xen event mechanism.
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*
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* Because virtual CPUs can be scheduled onto any real CPU, there's no
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* useful topology information for the kernel to make use of. As a
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* result, all CPUs are treated as if they're single-core and
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* single-threaded.
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*/
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <asm/paravirt.h>
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#include <asm/desc.h>
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#include <asm/pgtable.h>
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#include <asm/cpu.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/vcpu.h>
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#include <asm/xen/interface.h>
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#include <asm/xen/hypercall.h>
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#include <xen/xen.h>
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#include <xen/page.h>
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#include <xen/events.h>
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#include <xen/hvc-console.h>
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#include "xen-ops.h"
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#include "mmu.h"
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cpumask_var_t xen_cpu_initialized_map;
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static DEFINE_PER_CPU(int, xen_resched_irq);
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static DEFINE_PER_CPU(int, xen_callfunc_irq);
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static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
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static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
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static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
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static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
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/*
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* Reschedule call back.
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*/
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static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
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{
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inc_irq_stat(irq_resched_count);
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scheduler_ipi();
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return IRQ_HANDLED;
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}
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static void __cpuinit cpu_bringup(void)
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{
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int cpu;
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cpu_init();
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touch_softlockup_watchdog();
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preempt_disable();
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xen_enable_sysenter();
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xen_enable_syscall();
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cpu = smp_processor_id();
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smp_store_cpu_info(cpu);
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cpu_data(cpu).x86_max_cores = 1;
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set_cpu_sibling_map(cpu);
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xen_setup_cpu_clockevents();
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notify_cpu_starting(cpu);
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ipi_call_lock();
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set_cpu_online(cpu, true);
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ipi_call_unlock();
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this_cpu_write(cpu_state, CPU_ONLINE);
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wmb();
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/* We can take interrupts now: we're officially "up". */
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local_irq_enable();
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wmb(); /* make sure everything is out */
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}
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static void __cpuinit cpu_bringup_and_idle(void)
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{
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cpu_bringup();
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cpu_idle();
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}
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static int xen_smp_intr_init(unsigned int cpu)
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{
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int rc;
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const char *resched_name, *callfunc_name, *debug_name;
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resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
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rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
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cpu,
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xen_reschedule_interrupt,
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IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
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resched_name,
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NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_resched_irq, cpu) = rc;
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callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
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rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
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cpu,
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xen_call_function_interrupt,
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IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
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callfunc_name,
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NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_callfunc_irq, cpu) = rc;
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debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
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rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
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IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
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debug_name, NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_debug_irq, cpu) = rc;
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callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
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rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
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cpu,
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xen_call_function_single_interrupt,
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IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
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callfunc_name,
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NULL);
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if (rc < 0)
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goto fail;
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per_cpu(xen_callfuncsingle_irq, cpu) = rc;
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return 0;
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fail:
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if (per_cpu(xen_resched_irq, cpu) >= 0)
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unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
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if (per_cpu(xen_callfunc_irq, cpu) >= 0)
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unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
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if (per_cpu(xen_debug_irq, cpu) >= 0)
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unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
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if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
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unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
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NULL);
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return rc;
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}
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static void __init xen_fill_possible_map(void)
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{
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int i, rc;
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if (xen_initial_domain())
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return;
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for (i = 0; i < nr_cpu_ids; i++) {
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rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
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if (rc >= 0) {
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num_processors++;
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set_cpu_possible(i, true);
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}
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}
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}
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static void __init xen_filter_cpu_maps(void)
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{
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int i, rc;
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if (!xen_initial_domain())
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return;
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num_processors = 0;
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disabled_cpus = 0;
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for (i = 0; i < nr_cpu_ids; i++) {
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rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
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if (rc >= 0) {
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num_processors++;
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set_cpu_possible(i, true);
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} else {
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set_cpu_possible(i, false);
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set_cpu_present(i, false);
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}
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}
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}
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static void __init xen_smp_prepare_boot_cpu(void)
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{
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BUG_ON(smp_processor_id() != 0);
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native_smp_prepare_boot_cpu();
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/* We've switched to the "real" per-cpu gdt, so make sure the
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old memory can be recycled */
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make_lowmem_page_readwrite(xen_initial_gdt);
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xen_filter_cpu_maps();
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xen_setup_vcpu_info_placement();
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}
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static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
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{
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unsigned cpu;
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unsigned int i;
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if (skip_ioapic_setup) {
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char *m = (max_cpus == 0) ?
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"The nosmp parameter is incompatible with Xen; " \
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"use Xen dom0_max_vcpus=1 parameter" :
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"The noapic parameter is incompatible with Xen";
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xen_raw_printk(m);
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panic(m);
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}
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xen_init_lock_cpu(0);
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smp_store_cpu_info(0);
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cpu_data(0).x86_max_cores = 1;
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for_each_possible_cpu(i) {
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zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
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zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
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zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
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}
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set_cpu_sibling_map(0);
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if (xen_smp_intr_init(0))
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BUG();
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if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
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panic("could not allocate xen_cpu_initialized_map\n");
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cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
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/* Restrict the possible_map according to max_cpus. */
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while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
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for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
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continue;
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set_cpu_possible(cpu, false);
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}
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for_each_possible_cpu (cpu) {
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struct task_struct *idle;
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if (cpu == 0)
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continue;
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idle = fork_idle(cpu);
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if (IS_ERR(idle))
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panic("failed fork for CPU %d", cpu);
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set_cpu_present(cpu, true);
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}
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}
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static int __cpuinit
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cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
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{
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struct vcpu_guest_context *ctxt;
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struct desc_struct *gdt;
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unsigned long gdt_mfn;
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if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
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return 0;
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ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
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if (ctxt == NULL)
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return -ENOMEM;
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gdt = get_cpu_gdt_table(cpu);
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ctxt->flags = VGCF_IN_KERNEL;
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ctxt->user_regs.ds = __USER_DS;
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ctxt->user_regs.es = __USER_DS;
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ctxt->user_regs.ss = __KERNEL_DS;
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#ifdef CONFIG_X86_32
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ctxt->user_regs.fs = __KERNEL_PERCPU;
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ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
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#else
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ctxt->gs_base_kernel = per_cpu_offset(cpu);
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#endif
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ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
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ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
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memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
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xen_copy_trap_info(ctxt->trap_ctxt);
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ctxt->ldt_ents = 0;
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BUG_ON((unsigned long)gdt & ~PAGE_MASK);
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gdt_mfn = arbitrary_virt_to_mfn(gdt);
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make_lowmem_page_readonly(gdt);
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make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
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ctxt->gdt_frames[0] = gdt_mfn;
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ctxt->gdt_ents = GDT_ENTRIES;
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ctxt->user_regs.cs = __KERNEL_CS;
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ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
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ctxt->kernel_ss = __KERNEL_DS;
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ctxt->kernel_sp = idle->thread.sp0;
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#ifdef CONFIG_X86_32
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ctxt->event_callback_cs = __KERNEL_CS;
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ctxt->failsafe_callback_cs = __KERNEL_CS;
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#endif
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ctxt->event_callback_eip = (unsigned long)xen_hypervisor_callback;
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ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback;
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per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
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ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
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if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
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BUG();
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kfree(ctxt);
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return 0;
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}
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static int __cpuinit xen_cpu_up(unsigned int cpu)
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{
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struct task_struct *idle = idle_task(cpu);
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int rc;
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per_cpu(current_task, cpu) = idle;
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#ifdef CONFIG_X86_32
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irq_ctx_init(cpu);
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#else
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clear_tsk_thread_flag(idle, TIF_FORK);
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per_cpu(kernel_stack, cpu) =
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(unsigned long)task_stack_page(idle) -
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KERNEL_STACK_OFFSET + THREAD_SIZE;
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#endif
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xen_setup_runstate_info(cpu);
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xen_setup_timer(cpu);
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xen_init_lock_cpu(cpu);
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per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
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/* make sure interrupts start blocked */
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per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
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rc = cpu_initialize_context(cpu, idle);
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if (rc)
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return rc;
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if (num_online_cpus() == 1)
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alternatives_smp_switch(1);
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rc = xen_smp_intr_init(cpu);
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if (rc)
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return rc;
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rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
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BUG_ON(rc);
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while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
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HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
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barrier();
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}
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return 0;
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}
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static void xen_smp_cpus_done(unsigned int max_cpus)
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{
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static int xen_cpu_disable(void)
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{
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unsigned int cpu = smp_processor_id();
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if (cpu == 0)
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return -EBUSY;
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cpu_disable_common();
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load_cr3(swapper_pg_dir);
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return 0;
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}
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static void xen_cpu_die(unsigned int cpu)
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{
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while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
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current->state = TASK_UNINTERRUPTIBLE;
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schedule_timeout(HZ/10);
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}
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unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
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unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
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unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
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unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
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xen_uninit_lock_cpu(cpu);
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xen_teardown_timer(cpu);
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if (num_online_cpus() == 1)
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alternatives_smp_switch(0);
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}
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static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
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{
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play_dead_common();
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HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
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cpu_bringup();
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/*
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* Balance out the preempt calls - as we are running in cpu_idle
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* loop which has been called at bootup from cpu_bringup_and_idle.
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* The cpucpu_bringup_and_idle called cpu_bringup which made a
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* preempt_disable() So this preempt_enable will balance it out.
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*/
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preempt_enable();
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}
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#else /* !CONFIG_HOTPLUG_CPU */
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static int xen_cpu_disable(void)
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{
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return -ENOSYS;
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}
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static void xen_cpu_die(unsigned int cpu)
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{
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BUG();
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}
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static void xen_play_dead(void)
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{
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BUG();
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}
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#endif
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static void stop_self(void *v)
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{
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int cpu = smp_processor_id();
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/* make sure we're not pinning something down */
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load_cr3(swapper_pg_dir);
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/* should set up a minimal gdt */
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set_cpu_online(cpu, false);
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HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
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BUG();
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}
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static void xen_stop_other_cpus(int wait)
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{
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smp_call_function(stop_self, NULL, wait);
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}
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static void xen_smp_send_reschedule(int cpu)
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{
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xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
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}
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static void xen_send_IPI_mask(const struct cpumask *mask,
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enum ipi_vector vector)
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{
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unsigned cpu;
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for_each_cpu_and(cpu, mask, cpu_online_mask)
|
|
xen_send_IPI_one(cpu, vector);
|
|
}
|
|
|
|
static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
|
|
{
|
|
int cpu;
|
|
|
|
xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
|
|
|
|
/* Make sure other vcpus get a chance to run if they need to. */
|
|
for_each_cpu(cpu, mask) {
|
|
if (xen_vcpu_stolen(cpu)) {
|
|
HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void xen_smp_send_call_function_single_ipi(int cpu)
|
|
{
|
|
xen_send_IPI_mask(cpumask_of(cpu),
|
|
XEN_CALL_FUNCTION_SINGLE_VECTOR);
|
|
}
|
|
|
|
static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
|
|
{
|
|
irq_enter();
|
|
generic_smp_call_function_interrupt();
|
|
inc_irq_stat(irq_call_count);
|
|
irq_exit();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
|
|
{
|
|
irq_enter();
|
|
generic_smp_call_function_single_interrupt();
|
|
inc_irq_stat(irq_call_count);
|
|
irq_exit();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct smp_ops xen_smp_ops __initconst = {
|
|
.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
|
|
.smp_prepare_cpus = xen_smp_prepare_cpus,
|
|
.smp_cpus_done = xen_smp_cpus_done,
|
|
|
|
.cpu_up = xen_cpu_up,
|
|
.cpu_die = xen_cpu_die,
|
|
.cpu_disable = xen_cpu_disable,
|
|
.play_dead = xen_play_dead,
|
|
|
|
.stop_other_cpus = xen_stop_other_cpus,
|
|
.smp_send_reschedule = xen_smp_send_reschedule,
|
|
|
|
.send_call_func_ipi = xen_smp_send_call_function_ipi,
|
|
.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
|
|
};
|
|
|
|
void __init xen_smp_init(void)
|
|
{
|
|
smp_ops = xen_smp_ops;
|
|
xen_fill_possible_map();
|
|
xen_init_spinlocks();
|
|
}
|
|
|
|
static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
native_smp_prepare_cpus(max_cpus);
|
|
WARN_ON(xen_smp_intr_init(0));
|
|
|
|
xen_init_lock_cpu(0);
|
|
}
|
|
|
|
static int __cpuinit xen_hvm_cpu_up(unsigned int cpu)
|
|
{
|
|
int rc;
|
|
rc = native_cpu_up(cpu);
|
|
WARN_ON (xen_smp_intr_init(cpu));
|
|
return rc;
|
|
}
|
|
|
|
static void xen_hvm_cpu_die(unsigned int cpu)
|
|
{
|
|
unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
|
|
unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
|
|
unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
|
|
unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
|
|
native_cpu_die(cpu);
|
|
}
|
|
|
|
void __init xen_hvm_smp_init(void)
|
|
{
|
|
if (!xen_have_vector_callback)
|
|
return;
|
|
smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
|
|
smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
|
|
smp_ops.cpu_up = xen_hvm_cpu_up;
|
|
smp_ops.cpu_die = xen_hvm_cpu_die;
|
|
smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
|
|
smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
|
|
}
|