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CPUID leaf CPUID_Fn80000008_ECX provides information about the number of threads supported by the processor. It was found that the field ApicIdSize(bits 15-12) was not set correctly. ApicIdSize is defined as the number of bits required to represent all the ApicId values within a package. Valid Values: Value Description 3h-0h Reserved. 4h up to 16 threads. 5h up to 32 threads. 6h up to 64 threads. 7h up to 128 threads. Fh-8h Reserved. Fix the bit appropriately. This came up during following thread. https://lore.kernel.org/qemu-devel/158643709116.17430.15995069125716778943.malonedeb@wampee.canonical.com/#t Refer the Processor Programming Reference (PPR) for AMD Family 17h Model 01h, Revision B1 Processors. The documentation is available from the bugzilla Link below. Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 Reported-by: Philipp Eppelt <1871842@bugs.launchpad.net> Signed-off-by: Babu Moger <babu.moger@amd.com> Message-Id: <20200417215345.64800.73351.stgit@localhost.localdomain> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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