KVM: x86: emulator_cmpxchg_emulated should mark_page_dirty

emulator_cmpxchg_emulated writes to guest memory, therefore it should update the dirty bitmap accordingly. Signed-off-by: Marcelo Tosatti <[email protected]> Reviewed-by: Xiao Guangrong <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
AnTAVR · Feb 26, 2014 · d371401 · d371401
1 parent 390bd52
commit d371401
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
@@ -4399,6 +4399,7 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
 	if (!exchanged)
 		return X86EMUL_CMPXCHG_FAILED;
 
+	mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
 	kvm_mmu_pte_write(vcpu, gpa, new, bytes);
 
 	return X86EMUL_CONTINUE;