Il 02/06/2013 20:12, Gleb Natapov ha scritto:
> On Thu, May 30, 2013 at 04:35:55PM +0200, Paolo Bonzini wrote:
>> The x86-64 extended low-byte registers were fetched correctly from reg,
>> but not from mod/rm.
>>
>> This fixes another bug in the boot of RHEL5.9 64-bit, but it is still
>> not enough.
>>
> Did I missed unit test patch? :)
I wanted to ask the GSoC student to do it. If it doesn't come in a
couple of weeks, I'll send it.
Paolo
>> Cc: gnatapov@xxxxxxxxxx
>> Cc: kvm@xxxxxxxxxxxxxxx
>> Cc: <stable@xxxxxxxxxxxxxxx> # 3.9
>> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
>> ---
>> arch/x86/kvm/emulate.c | 5 ++++-
>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
>> index aa68106..028b34f 100644
>> --- a/arch/x86/kvm/emulate.c
>> +++ b/arch/x86/kvm/emulate.c
>> @@ -1239,9 +1239,12 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
>> ctxt->modrm_seg = VCPU_SREG_DS;
>>
>> if (ctxt->modrm_mod == 3) {
>> + int highbyte_regs = ctxt->rex_prefix == 0;
>> +
>> op->type = OP_REG;
>> op->bytes = (ctxt->d & ByteOp) ? 1 : ctxt->op_bytes;
>> - op->addr.reg = decode_register(ctxt, ctxt->modrm_rm, ctxt->d & ByteOp);
>> + op->addr.reg = decode_register(ctxt, ctxt->modrm_rm,
>> + highbyte_regs && (ctxt->d & ByteOp));
>> if (ctxt->d & Sse) {
>> op->type = OP_XMM;
>> op->bytes = 16;
>> --
>> 1.8.1.4
>
> --
> Gleb.
> --
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