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authorLan Tianyu <tianyu.lan@intel.com>2016-03-13 11:10:25 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2016-03-22 16:38:29 +0100
commit36ca7e0a577aa61f648953886958e50398732d63 (patch)
tree2dc262ff52cec489c35342541ea1e49e3d444a7d /arch
parent9753f529156d03112d1ff6f3758ccd6fa6faf189 (diff)
KVM/x86: Replace smp_mb() with smp_store_mb/release() in the walk_shadow_page_lockless_begin/end()
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/mmu.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index fc8ab1f67d00..6bdfbc23ecaa 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -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();
}

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