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xen-devel
Re: [Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows
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To: |
"Li, Xin B" <xin.b.li@xxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>, "Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows |
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From: |
Keir Fraser <keir@xxxxxxxxxxxxx> |
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Date: |
Tue, 14 Nov 2006 17:56:55 +0000 |
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Cc: |
"Mallick, Asit K" <asit.k.mallick@xxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Li, Susie" <susie.li@xxxxxxxxx>, "He, Qing" <qing.he@xxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx> |
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Tue, 14 Nov 2006 09:57:13 -0800 |
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[Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows |
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On 14/11/06 17:42, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote:
>> Any idea what it's trying to access? Presumably nothing is
>> mapped up there
>> so it just gets all-ones back from reads? I'm surprised it
>> would be doing
>> lots of accesses to totally unused memory space. That tends to
>> be fairly
>> slow even on native hardware.
>>
>
> that are from detecting if a guest page table page is no longer a page
> table page, like in validate_gl4e.
I'll leave it to Tim to decide what the best thing to do here is. But I'm
sure we don't need a max_gpfn parameter. Xen could maintain its own
highwater mark, updated by the alloc_p2m path, if it needs it.
-- Keir
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