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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)
commitd688a7a94b11bdbcfc86ebed8643b0cd0904a2ad
treeff416cf45a7721c67789dd32b7bcb49f3151d5f0tree | snapshot
parentb1d78d6d4537ecdbaefe6c76311dee14c433a75bcommit | 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 | history
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