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KVM: x86: cmpxchg emulation should compare in reverse order 

The current implementation of cmpxchg does not update the flags correctly,
since the accumulator should be compared with the destination and not the other
way around. The current implementation does not update the flags correctly.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-06-02 18:34:07 +03:00 committed by Paolo Bonzini
parent 606b1c3e87
commit 37c564f285
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kvm/emulate.c
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@ -2052,8 +2052,10 @@ static int em_ret_far_imm(struct x86_emulate_ctxt *ctxt)
static int em_cmpxchg(struct x86_emulate_ctxt *ctxt)
{
/* Save real source value, then compare EAX against destination. */
ctxt->dst.orig_val = ctxt->dst.val;
ctxt->dst.val = reg_read(ctxt, VCPU_REGS_RAX);
ctxt->src.orig_val = ctxt->src.val;
ctxt->src.val = reg_read(ctxt, VCPU_REGS_RAX);
ctxt->src.val = ctxt->dst.orig_val;
fastop(ctxt, em_cmp);
if (ctxt->eflags & EFLG_ZF) {
@ -2063,6 +2065,7 @@ static int em_cmpxchg(struct x86_emulate_ctxt *ctxt)
/* Failure: write the value we saw to EAX. */
ctxt->dst.type = OP_REG;
ctxt->dst.addr.reg = reg_rmw(ctxt, VCPU_REGS_RAX);
ctxt->dst.val = ctxt->dst.orig_val;
}
return X86EMUL_CONTINUE;
}