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xen-devel
[Xen-devel] RE: Avoid alloc for xsave before xsave_init
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To: |
Keir Fraser <keir@xxxxxxx>, "Huang2, Wei" <Wei.Huang2@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] RE: Avoid alloc for xsave before xsave_init |
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From: |
"Wei, Gang" <gang.wei@xxxxxxxxx> |
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Date: |
Sun, 16 Jan 2011 23:23:53 +0800 |
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"Wei, Gang" <gang.wei@xxxxxxxxx> |
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Sun, 16 Jan 2011 07:26:03 -0800 |
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Thread-topic: |
Avoid alloc for xsave before xsave_init |
Keir Fraser wrote on 2011-01-14:
> On 14/01/2011 07:11, "Wei, Gang" <gang.wei@xxxxxxxxx> wrote:
>
>>> I agree that do test-and-exit on is_idle_vcpu() in
>>> Xsave_{alloc,free}_save_area.
>>> Further, We'd better add assert(xsave_cntxt_size>=576) after the
>>> test-and-exit clause to ensure no buffer overflow will happen in the future.
>>>
>>> I reviewed the context switch code and assure context switch code
>>> not be doing XSAVE when switching out an idle vcpu.
>>
>> Here is the patch.
>
> I applied your patch, plus some cleanup, as of c/s 22751.
Your cleanup looks good.
Jimmy
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