The emulation of CMPXCHG with two register operands in 64-bit mistakenly masks the high 32-bits as it performs assignment. Fix it. Fixes: 2fcf5c8ae244b4c298d2111a288d410a719ac626 Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx> --- arch/x86/kvm/emulate.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 630bcb0..84c132b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2242,6 +2242,8 @@ static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) ctxt->src.val = ctxt->dst.orig_val; /* Create write-cycle to dest by writing the same value */ ctxt->dst.val = ctxt->dst.orig_val; + if (ctxt->dst.type != OP_MEM) + ctxt->dst.type = OP_NONE; } return X86EMUL_CONTINUE; } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
