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KVM: x86 emulator: Disable writeback for CMP emulation
This stops "CMP r/m, reg" to write back the data into memory. Pointed out by Avi. The writeback suppression now covers CMP, CMPS, SCAS. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>
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