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Diffstat (limited to 'arch/x86/kernel/kvm.c')
-rw-r--r--arch/x86/kernel/kvm.c30
1 files changed, 19 insertions, 11 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 3dd8e2c4d74a..f6945bef2cd1 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -35,6 +35,7 @@
#include <linux/slab.h>
#include <linux/kprobes.h>
#include <linux/debugfs.h>
+#include <linux/nmi.h>
#include <asm/timer.h>
#include <asm/cpu.h>
#include <asm/traps.h>
@@ -243,9 +244,9 @@ u32 kvm_read_and_reset_pf_reason(void)
{
u32 reason = 0;
- if (__get_cpu_var(apf_reason).enabled) {
- reason = __get_cpu_var(apf_reason).reason;
- __get_cpu_var(apf_reason).reason = 0;
+ if (__this_cpu_read(apf_reason.enabled)) {
+ reason = __this_cpu_read(apf_reason.reason);
+ __this_cpu_write(apf_reason.reason, 0);
}
return reason;
@@ -318,7 +319,7 @@ static void kvm_guest_apic_eoi_write(u32 reg, u32 val)
* there's no need for lock or memory barriers.
* An optimization barrier is implied in apic write.
*/
- if (__test_and_clear_bit(KVM_PV_EOI_BIT, &__get_cpu_var(kvm_apic_eoi)))
+ if (__test_and_clear_bit(KVM_PV_EOI_BIT, this_cpu_ptr(&kvm_apic_eoi)))
return;
apic_write(APIC_EOI, APIC_EOI_ACK);
}
@@ -329,13 +330,13 @@ void kvm_guest_cpu_init(void)
return;
if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF) && kvmapf) {
- u64 pa = slow_virt_to_phys(&__get_cpu_var(apf_reason));
+ u64 pa = slow_virt_to_phys(this_cpu_ptr(&apf_reason));
#ifdef CONFIG_PREEMPT
pa |= KVM_ASYNC_PF_SEND_ALWAYS;
#endif
wrmsrl(MSR_KVM_ASYNC_PF_EN, pa | KVM_ASYNC_PF_ENABLED);
- __get_cpu_var(apf_reason).enabled = 1;
+ __this_cpu_write(apf_reason.enabled, 1);
printk(KERN_INFO"KVM setup async PF for cpu %d\n",
smp_processor_id());
}
@@ -344,8 +345,8 @@ void kvm_guest_cpu_init(void)
unsigned long pa;
/* Size alignment is implied but just to make it explicit. */
BUILD_BUG_ON(__alignof__(kvm_apic_eoi) < 4);
- __get_cpu_var(kvm_apic_eoi) = 0;
- pa = slow_virt_to_phys(&__get_cpu_var(kvm_apic_eoi))
+ __this_cpu_write(kvm_apic_eoi, 0);
+ pa = slow_virt_to_phys(this_cpu_ptr(&kvm_apic_eoi))
| KVM_MSR_ENABLED;
wrmsrl(MSR_KVM_PV_EOI_EN, pa);
}
@@ -356,11 +357,11 @@ void kvm_guest_cpu_init(void)
static void kvm_pv_disable_apf(void)
{
- if (!__get_cpu_var(apf_reason).enabled)
+ if (!__this_cpu_read(apf_reason.enabled))
return;
wrmsrl(MSR_KVM_ASYNC_PF_EN, 0);
- __get_cpu_var(apf_reason).enabled = 0;
+ __this_cpu_write(apf_reason.enabled, 0);
printk(KERN_INFO"Unregister pv shared memory for cpu %d\n",
smp_processor_id());
@@ -499,6 +500,13 @@ void __init kvm_guest_init(void)
#else
kvm_guest_cpu_init();
#endif
+
+ /*
+ * Hard lockup detection is enabled by default. Disable it, as guests
+ * can get false positives too easily, for example if the host is
+ * overcommitted.
+ */
+ watchdog_enable_hardlockup_detector(false);
}
static noinline uint32_t __kvm_cpuid_base(void)
@@ -716,7 +724,7 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want)
if (in_nmi())
return;
- w = &__get_cpu_var(klock_waiting);
+ w = this_cpu_ptr(&klock_waiting);
cpu = smp_processor_id();
start = spin_time_start();