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

[Keir Fraser <keir@xxxxxxxxxxxxx>]

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.

 -- Keir


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