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xen-devel
RE: [Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows
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To: |
"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: |
"Li, Xin B" <xin.b.li@xxxxxxxxx> |
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Date: |
Wed, 15 Nov 2006 01:42:46 +0800 |
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Cc: |
"Mallick, Asit K" <asit.k.mallick@xxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Li, Susie" <susie.li@xxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>, "He, Qing" <qing.he@xxxxxxxxx> |
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Tue, 14 Nov 2006 09:43:08 -0800 |
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Thread-topic: |
[Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows |
>
>On 14/11/06 17:33, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote:
>
>> On x86_64 xen, we saw get_mfn_from_gpfn gets into the fault-and-fixup
>> path frequently when running 64bit windows guests with 1G
>RAM, and quite
>> a few of them are caused by gpfn > 0x100000, i.e. above 4G,
>so how about
>> aslo adding a gpfn range check into get_mfn_from_gpfn? And we can use
>> hvm_set_param to set the max gpfn # in xc_hvm_build.c.
>
>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.
-Xin
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