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? :)
> 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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