linux-kernel - Re: [PATCH] KVM: x86 emulator: emulate MOVNTDQ

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Date:	Sun, 13 Jul 2014 19:12:23 +0300
From:	Avi Kivity <avi.kivity@...il.com>
To:	Paolo Bonzini <pbonzini@...hat.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Eric Northup <digitaleric@...gle.com>
CC:	KVM <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: x86 emulator: emulate MOVNTDQ


On 07/11/2014 11:40 PM, Paolo Bonzini wrote:
> Il 11/07/2014 22:05, Alex Williamson ha scritto:
>> Which will return 'true' for this whether I specify Aligned or not.  If
>> the standard convention is to make it explicit, I'm happy to add the
>> extra flag, but I think we already #GP on unaligned as implemented here.
>> Thanks,
>
> We should still specify Aligned if the corresponding AVX instruction 
> requires an aligned operand.  ISTR that this is not the case for 
> MOVNTDQ, so your patch is correct.  I'll check the SDM more carefully 
> next Monday.
>

The explicitly aligned/unaligned instructions have an A or a U to 
indicate this (e.g. MOVDQU = explicitly unaligned, MOVDQA = explicitly 
aligned, MOVNTDQ = default).

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