[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Ping: [PATCH v2 1/2] viridian: remove implicit limit of 64 VPs per partition
On 25.01.2021 16:37, Igor Druzhinin wrote: > On 12/01/2021 04:17, Igor Druzhinin wrote: >> TLFS 7.8.1 stipulates that "a virtual processor index must be less than >> the maximum number of virtual processors per partition" that "can be obtained >> through CPUID leaf 0x40000005". Furthermore, "Requirements for Implementing >> the Microsoft Hypervisor Interface" defines that starting from Windows Server >> 2012, which allowed more than 64 CPUs to be brought up, this leaf can now >> contain a value -1 basically assuming the hypervisor has no restriction while >> 0 (that we currently expose) means the default restriction is still present. >> >> Along with the previous changes exposing ExProcessorMasks this allows a >> recent >> Windows VM with Viridian extension enabled to have more than 64 vCPUs without >> going into BSOD in some cases. >> >> Since we didn't expose the leaf before and to keep CPUID data consistent for >> incoming streams from previous Xen versions - let's keep it behind an option. >> >> Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx> >> --- > > ping? Paul? Paul - I saw a reply by you on patch 2, but not on this one. libxl maintainers - both patches would want to be acked by you. Jan
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