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KVM: x86: BSF and BSR emulation change register unnecassarily
authorNadav Amit <namit@cs.technion.ac.il>
Mon, 30 Mar 2015 12:39:21 +0000 (15:39 +0300)
committerPaolo Bonzini <pbonzini@redhat.com>
Mon, 30 Mar 2015 14:46:11 +0000 (16:46 +0200)
commit900efe200e317649aecbeaa55619a4fc3adb2251
tree88322796917be9a8edc1b43adb7f0d932e8acea8tree
parent6fd8e1275709a5bb084847eda6730b983538a572commit | diff
KVM: x86: BSF and BSR emulation change register unnecassarily

If the source of BSF and BSR is zero, the destination register should not
change. That is how real hardware behaves.  If we set the destination even with
the same value that we had before, we may clear bits [63:32] unnecassarily.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Message-Id: <1427719163-5429-4-git-send-email-namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/emulate.c diff | blob | blame | history
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