| Date | Fri, 24 Mar 2023 13:41:39 -0700 | Subject | Re: [PATCH v3 07/13] KVM: selftests: x86: Fix the checks to XFD_ERR using and operation | From | Sean Christopherson <> |
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On Tue, Feb 21, 2023, Mingwei Zhang wrote: > Fix the checks to XFD_ERR using logical AND operation because XFD_ERR might > contain more information in the future. According Intel SDM Vol 1. 13.14:
If that happens, then the future change is responsible for updating the check. The test very clearly does a straight write of MSR_IA32_XFD. If there are extra bits set then something is broken.
wrmsr(MSR_IA32_XFD, XFEATURE_MASK_XTILEDATA);
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