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authorTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>2014-02-18 17:22:47 +0900
committerPaolo Bonzini <pbonzini@redhat.com>2014-02-18 10:07:26 +0100
commit5befdc385ddb2d5ae8995ad89004529a3acf58fc (patch)
treee31e48e6f1f810596b6c5ca9663c02c02ed319b5 /virt
parentf18eb31f9df52c28ec86d18d72f66ef689878daa (diff)
downloadkernel-5befdc385ddb2d5ae8995ad89004529a3acf58fc.tar.gz
KVM: Simplify kvm->tlbs_dirty handling
When this was introduced, kvm_flush_remote_tlbs() could be called without holding mmu_lock. It is now acknowledged that the function must be called before releasing mmu_lock, and all callers have already been changed to do so. There is no need to use smp_mb() and cmpxchg() any more. Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a9e999a48e43..f5668a431d54 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -186,12 +186,9 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
void kvm_flush_remote_tlbs(struct kvm *kvm)
{
- long dirty_count = kvm->tlbs_dirty;
-
- smp_mb();
if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
++kvm->stat.remote_tlb_flush;
- cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
+ kvm->tlbs_dirty = false;
}
EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);