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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Ryzen 3xxx works with Windows
On 18.11.2019 12:39, George Dunlap wrote: > On 11/15/19 5:06 PM, Andreas Kinzler wrote: >> Hello All, >> >> I compared the CPUID listings from Ryzen 2700X (attached as tar.xz) to >> 3700X and found only very few differences. I added >> >> cpuid = [ "0x80000008:ecx=xxxxxxxxxxxxxxxx0100xxxxxxxxxxxx" ] >> >> to xl.cfg and then Windows runs great with 16 vCPUs. Cinebench R15 score >> is >2050 which is more or less the bare metal value. > > So this is setting those bits to 0100, or 4. One of the many possible problems with our incrementing of this field could be that this results in a value that in "reserved" as per AMD's documentation. At least for some of the Fam17 models they document exactly which values are "legal". This may then (further) get in the way of OSes trying to fully split APIC IDs into the parts correlating with the topological sub-units (thread, core, core complex, die, socket). Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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