Re: KVM: x86: emulator_cmpxchg_emulated should mark_page_dirty

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Il 26/02/2014 02:44, Marcelo Tosatti ha scritto:

emulator_cmpxchg_emulated writes to guest memory, therefore it should
updated the dirty bitmap accordingly.

Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 39c28f09..29db96d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4394,6 +4394,7 @@ 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;
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Applied to kvm/queue, thanks.

Paolo
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