RE: [Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

>
>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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