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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.Fraser@xxxxxxxxxxxx>, "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 01:33:39 +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 09:34:02 -0800 |
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Thread-topic: |
[Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows |
>The PV drivers should not have been hitting the MMIO region with
>any regularity however. Is it the LAPIC and IOAPIC that are getting
> hit? It certainly makes sense to cover hot regions of the P2M table
> with valid mappings - we should not expect the fault-and-fixup
> path to be fast. A single extra pagetable with INVALID_MFN just
>below 4GB would I'm sure speed things up quite a bit!
Keir
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.
-Xin
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