linux-kernel - Re: [PATCH 2/8] KVM: x86 emulator: use aligned variants of SSE register ops

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Message-ID: <CA+rthh8T3Y9XAz+J3C7KfeJa_0d9if9GSrhwTNYhPR+RgEnXKg@mail.gmail.com>
Date:	Tue, 4 Sep 2012 14:51:06 +0200
From:	Mathias Krause <minipli@...glemail.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] KVM: x86 emulator: use aligned variants of SSE
 register ops

On Tue, Sep 4, 2012 at 2:13 PM, Avi Kivity <avi@...hat.com> wrote:
> On 09/04/2012 03:09 PM, Avi Kivity wrote:
>> On 08/30/2012 02:30 AM, Mathias Krause wrote:
>>> As the the compiler ensures that the memory operand is always aligned
>>> to a 16 byte memory location,
>>
>> I'm not sure it does.  Is V4SI aligned?  Do we use alignof() to
>> propagate the alignment to the vcpu allocation code?

I checked that to by introducing a dummy char member in struct operand
that would have misaligned vec_val but, indeed, the compiler ensured
it's still 16 byte aligned.

>
> We actually do.  But please rebase the series against next, I got some
> conflicts while applying.

If "next" means kvm/next
(i.e.git://git.kernel.org/pub/scm/virt/kvm/kvm.git#next) here, the
whole series applies cleanly for me.
HEAD in kvm/next is 9a78197 "KVM: x86: remove unused variable from
kvm_task_switch()" here. Albeit the series was build against kvm/next
at the time as a81aba1 "KVM: VMX: Ignore segment G and D bits when
considering whether we can virtualize" was HEAD in this branch.

Could you please retry and show me the conflicts you get?

Regards,
Mathias
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