linux-kernel - Re: [PATCH] KVM: fix sil/dil/bpl/spl in the mod/rm fields

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Date:	Mon, 3 Jun 2013 11:28:10 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] KVM: fix sil/dil/bpl/spl in the mod/rm fields

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.
> 
> Cc: gnatapov@...hat.com
> Cc: kvm@...r.kernel.org
> Cc: <stable@...r.kernel.org> # 3.9
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Applied to master, thanks.

> ---
>  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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