[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [Patch 2/4] Refining Xsave/Xrestore support
>>> On 28.10.10 at 09:55, Haitao Shan <maillists.shan@xxxxxxxxx> wrote: > In my patch, if processor supports CR4.OSXSAVE, Xen will enable it and > won't clear it as long as we are in ROOT mode. Ah, okay. There's one problem with this, however - a pv domain the kernel of which doesn't support xsave would still see CPUID report the OSXSAVE bit set, and hence applications could be lead to believe they can use the wider registers. I realize this also puts under question our model of having the kernel look at CPUID's OSXSAVE bit, but that could possibly be dealt with by having pv_cpuid() (and perhaps xc_cpuid_pv_policy()) set the bit in case Xen supports xsave. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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