KVM: x86 emulator: fix RCX access during rep emulation
During rep emulation access length to RCX depends on current address
mode.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 0b70a36..4dce805 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1852,7 +1852,7 @@
if (c->rep_prefix && (c->d & String)) {
/* All REP prefixes have the same first termination condition */
- if (c->regs[VCPU_REGS_RCX] == 0) {
+ if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0) {
kvm_rip_write(ctxt->vcpu, c->eip);
goto done;
}
@@ -1876,7 +1876,7 @@
goto done;
}
}
- c->regs[VCPU_REGS_RCX]--;
+ register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1);
c->eip = kvm_rip_read(ctxt->vcpu);
}