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KVM: x86 emulator: disable writeback for TEST
authorAvi Kivity <avi@redhat.com>
Sun, 11 Sep 2011 08:23:02 +0000 (11:23 +0300)
committerAvi Kivity <avi@redhat.com>
Sun, 25 Sep 2011 16:52:40 +0000 (19:52 +0300)
commitcaa8a168e35650961b9b0d43b9b6fc2279351949
treeff416cf45a7721c67789dd32b7bcb49f3151d5f0tree
parentc61fa9d63b40b06522c5f1d940b084323a090688commit | diff
KVM: x86 emulator: disable writeback for TEST

The TEST instruction doesn't write its destination operand.  This
could cause problems if an MMIO register was accessed using the TEST
instruction.  Recently Windows XP was observed to use TEST against
the APIC ICR; this can cause spurious IPIs.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
arch/x86/kvm/emulate.c diff | blob | blame | history
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