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KVM/x86: Replace smp_mb() with smp_store_mb/release() in the walk_shadow_page_lockless_begin/end()

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Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lan Tianyu 2016-03-13 11:10:25 +08:00 committed by Paolo Bonzini
parent 9753f52915
commit 36ca7e0a57
1 changed files with 3 additions and 4 deletions
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7
arch/x86/kvm/mmu.c
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@ -632,12 +632,12 @@ static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu)
* kvm_flush_remote_tlbs() IPI to all active vcpus.
*/
local_irq_disable();
vcpu->mode = READING_SHADOW_PAGE_TABLES;
/*
* Make sure a following spte read is not reordered ahead of the write
* to vcpu->mode.
*/
smp_mb();
smp_store_mb(vcpu->mode, READING_SHADOW_PAGE_TABLES);
}
static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu)
@ -647,8 +647,7 @@ static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu)
* reads to sptes. If it does, kvm_commit_zap_page() can see us
* OUTSIDE_GUEST_MODE and proceed to free the shadow page table.
*/
smp_mb();
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_store_release(&vcpu->mode, OUTSIDE_GUEST_MODE);
local_irq_enable();
}