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KVM: Add "exiting guest mode" state 

Currently we keep track of only two states: guest mode and host
mode.  This patch adds an "exiting guest mode" state that tells
us that an IPI will happen soon, so unless we need to wait for the
IPI, we can avoid it completely.

Also
1: No need atomically to read/write ->mode in vcpu's thread

2: reorganize struct kvm_vcpu to make ->mode and ->requests
   in the same cache line explicitly

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2011-01-12 15:40:31 +08:00 committed by Marcelo Tosatti
parent d48ead8b0b
commit 6b7e2d0991
4 changed files with 35 additions and 12 deletions
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2
arch/ia64/kvm/kvm-ia64.c
View File

@ -662,6 +662,7 @@ again:
goto vcpu_run_fail;
srcu_read_unlock(&vcpu->kvm->srcu, idx);
vcpu->mode = IN_GUEST_MODE;
kvm_guest_enter();
/*
@ -683,6 +684,7 @@ again:
*/
barrier();
kvm_guest_exit();
vcpu->mode = OUTSIDE_GUEST_MODE;
preempt_enable();
idx = srcu_read_lock(&vcpu->kvm->srcu);

16
arch/x86/kvm/x86.c
View File

@ -5210,14 +5210,18 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
kvm_load_guest_fpu(vcpu);
kvm_load_guest_xcr0(vcpu);
atomic_set(&vcpu->guest_mode, 1);
smp_wmb();
vcpu->mode = IN_GUEST_MODE;
/* We should set ->mode before check ->requests,
* see the comment in make_all_cpus_request.
*/
smp_mb();
local_irq_disable();
if (!atomic_read(&vcpu->guest_mode) || vcpu->requests
if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
|| need_resched() || signal_pending(current)) {
atomic_set(&vcpu->guest_mode, 0);
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
local_irq_enable();
preempt_enable();
@ -5253,7 +5257,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
kvm_get_msr(vcpu, MSR_IA32_TSC, &vcpu->arch.last_guest_tsc);
atomic_set(&vcpu->guest_mode, 0);
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
local_irq_enable();
@ -6157,7 +6161,7 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
me = get_cpu();
if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
if (atomic_xchg(&vcpu->guest_mode, 0))
if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE)
smp_send_reschedule(cpu);
put_cpu();
}

22
include/linux/kvm_host.h
View File

@ -98,19 +98,26 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
#endif
enum {
OUTSIDE_GUEST_MODE,
IN_GUEST_MODE,
EXITING_GUEST_MODE
};
struct kvm_vcpu {
struct kvm *kvm;
#ifdef CONFIG_PREEMPT_NOTIFIERS
struct preempt_notifier preempt_notifier;
#endif
int cpu;
int vcpu_id;
struct mutex mutex;
int cpu;
atomic_t guest_mode;
struct kvm_run *run;
int srcu_idx;
int mode;
unsigned long requests;
unsigned long guest_debug;
int srcu_idx;
struct mutex mutex;
struct kvm_run *run;
int fpu_active;
int guest_fpu_loaded, guest_xcr0_loaded;
@ -140,6 +147,11 @@ struct kvm_vcpu {
struct kvm_vcpu_arch arch;
};
static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
{
return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
}
/*
* Some of the bitops functions do not support too long bitmaps.
* This number must be determined not to exceed such limits.

7
virt/kvm/kvm_main.c
View File

@ -171,7 +171,12 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
if (kvm_make_check_request(req, vcpu))
continue;
cpu = vcpu->cpu;
if (cpus != NULL && cpu != -1 && cpu != me)
/* Set ->requests bit before we read ->mode */
smp_mb();
if (cpus != NULL && cpu != -1 && cpu != me &&
kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
cpumask_set_cpu(cpu, cpus);
}
if (unlikely(cpus == NULL))