linux-kernel - Re: [PATCH v2 9/9] KVM: vmx: vmx instructions handling does not consider cs.l

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Date:	Wed, 18 Jun 2014 18:06:57 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Nadav Amit <nadav.amit@...il.com>,
	Nadav Amit <namit@...technion.ac.il>
CC:	gleb@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH v2 9/9] KVM: vmx: vmx instructions handling does not consider
 cs.l

Il 18/06/2014 18:01, Nadav Amit ha scritto:
>>
>
> Perhaps I am missing something, but I don't see where my mistake is.
> The VMREAD source operand is always read as 64-bits and I made no
> changes there. Therefore, if bits 63:32 are not zero, the instruction
> should fail when attempting to access the field.

In 32-bit mode, it should be read as 32 bits: "Outside IA-32e mode, the 
source operand has 32 bits, regardless of the value of CS.D" (so it's 
never 16 bits, but it's also never 64 bits).

Paolo
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