linux-kernel - Re: [PATCH] KVM: Emulator: Opcode 0x80 gets a byte immediate

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Message-ID: <20120429082233.GX15413@redhat.com>
Date:	Sun, 29 Apr 2012 11:22:33 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Nadav Amit <namit@...technion.ac.il>
Cc:	avi@...hat.com, mtosatti@...hat.com, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] KVM: Emulator: Opcode 0x80 gets a byte immediate

On Fri, Apr 27, 2012 at 05:23:36PM +0300, Nadav Amit wrote:
> The single byte opcode 0x80 should get a byte immediate.
> The previous emulation is broken for opcode 0x80.
It is not. That what ByteOp is about.

> ---
>  arch/x86/kvm/emulate.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> index 8375622..dd53e53 100644
> --- a/arch/x86/kvm/emulate.c
> +++ b/arch/x86/kvm/emulate.c
> @@ -3464,7 +3464,7 @@ static struct opcode opcode_table[256] = {
>  	/* 0x70 - 0x7F */
>  	X16(D(SrcImmByte)),
>  	/* 0x80 - 0x87 */
> -	G(ByteOp | DstMem | SrcImm | ModRM | Group, group1),
> +	G(ByteOp | DstMem | SrcImmByte | ModRM | Group, group1),
>  	G(DstMem | SrcImm | ModRM | Group, group1),
>  	G(ByteOp | DstMem | SrcImm | ModRM | No64 | Group, group1),
>  	G(DstMem | SrcImmByte | ModRM | Group, group1),
> -- 
> 1.7.4.1
> 
> --
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--
			Gleb.
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