8be11d4db2
When the kernel is running in a virtual machine, it cannot rely upon the processor family to determine if the workaround for AMD Family 10h Erratum 383 should be enabled. To enable virtual machine migration among a heterogeneous collection of physical machines, the hypervisor may have been configured to report an older processor family with a reduced feature set. Effectively, the reported processor family and its features are like a "least common denominator" for the collection of machines. Therefore, when the kernel is running in a virtual machine, instead of relying upon the processor family, we now test for features that prove that the underlying processor is not affected by the erratum. (The features that we test for are unlikely to ever be emulated in software on an affected physical processor.) PR: 186061 |
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