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KVM: x86: emulation of dword cmov on long-mode should clear [63:32]
authorNadav Amit <namit@cs.technion.ac.il>
Sun, 15 Jun 2014 13:13:00 +0000 (16:13 +0300)
committerPaolo Bonzini <pbonzini@redhat.com>
Thu, 19 Jun 2014 10:52:10 +0000 (12:52 +0200)
commit140bad89fd25db1aab60f80ed7874e9a9bdbae3b
tree804730300e75d1574caacd63a89fee2c0896894etree | snapshot
parent9e8919ae793f4edfaa29694a70f71a515ae9942acommit | diff
KVM: x86: emulation of dword cmov on long-mode should clear [63:32]

Even if the condition of cmov is not satisfied, bits[63:32] should be cleared.
This is clearly stated in Intel's CMOVcc documentation.  The solution is to
reassign the destination onto itself if the condition is unsatisfied.  For that
matter the original destination value needs to be read.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/emulate.c diff | blob | history
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