[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 3/6] X86: Disable PCID/INVPCID for dom0
>>> On 27.11.11 at 11:16, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote: > Jan Beulich wrote: >>>>> On 24.11.11 at 16:53, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote: >>> This patch disable PCID/INVPCID for dom0. >> >> Do we really need to disable it, rather than making it work? >> Conceptually the feature seems usable, and the instruction would >> need replacement by a hypercall anyway (just like invlpg). > > It's a design choice. > Exposing PCID/INVPCID to pv would involve some additional task, like > coordinated PCID allocation algorithm, or change vmm vcpu context swich, > which would make it complex. However, exposing PCID/INVPCID to pv has not > obvious benefit or even result in performance regression. Would you mind elaborating on that statement? Jan > So we choose to disable PCID/INVPCID to pv. > > Thanks, > Jinsong _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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