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: NMarcelo Tosatti <mtosatti@redhat.com> Reviewed-by: NXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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