[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] iommu/quirk: disable shared EPT for Sandybridge and earlier processors.
On 26/11/15 08:45, Jan Beulich wrote: >>>> On 25.11.15 at 16:58, <malcolm.crossley@xxxxxxxxxx> wrote: >> On 25/11/15 15:38, Jan Beulich wrote: >>>>>> On 25.11.15 at 16:13, <andrew.cooper3@xxxxxxxxxx> wrote: >>>> On 25/11/15 10:49, Jan Beulich wrote: >>>>> And finally I'm not fully convinced using CPU model info to deduce >>>>> chipset behavior is entirely correct (albeit perhaps in practice it'll >>>>> be fine except maybe when running Xen itself virtualized). >>>> What else would you suggest? I can't think of any better identifying >>>> information. >>> Chipset IDs / revisions? >> In this case the IOMMU is integrated into the Sandybridge-EP processor >> itself. > Which doesn't preclude it to be identified via PCI device ID - after all > there are dozens of processor integrated PCI devices. Looking at > one of my systems, > > 00:05.0 System peripheral [0880]: Intel Corporation Sandy Bridge Address Map, > VTd_Misc, System Management [8086:3c28] (rev 07) > 80:05.0 System peripheral [0880]: Intel Corporation Sandy Bridge Address Map, > VTd_Misc, System Management [8086:3c28] (rev 07) > > could be a candidate (we already key a quirk on this device in > pci_vtd_quirk()). These are fine for server variants, but not for desktop variants, both of which we have seen in use. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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