Messages in this thread | | | Date | Thu, 16 Jun 2022 23:27:08 +0800 | Subject | Re: [PATCH 16/19] KVM: x86: Enable CET virtualization for VMX and advertise CET to userspace | From | "Yang, Weijiang" <> |
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On 6/16/2022 6:59 PM, Peter Zijlstra wrote: > On Thu, Jun 16, 2022 at 04:46:40AM -0400, Yang Weijiang wrote: >> Set the feature bits so that CET capabilities can be seen in guest via >> CPUID enumeration. Add CR4.CET bit support in order to allow guest set CET >> master control bit(CR4.CET). >> >> Disable KVM CET feature if unrestricted_guest is unsupported/disabled as >> KVM does not support emulating CET. >> >> Don't expose CET feature if dependent CET bits are cleared in host XSS, >> or if XSAVES isn't supported. Updating the CET features in common x86 is >> a little ugly, but there is no clean solution without risking breakage of >> SVM if SVM hardware ever gains support for CET, e.g. moving everything to >> common x86 would prematurely expose CET on SVM. The alternative is to >> put all the logic in VMX, but that means rereading host_xss in VMX and >> duplicating the XSAVES check across VMX and SVM. > Doesn't Zen3 already have SHSTK ?
Hmm, you remind me of reading more specs from AMD... I'll check their HW solution
if it's available.
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