Messages in this thread | | | Date | Sat, 5 Aug 2023 00:02:28 +0200 | Subject | Re: [PATCH v5 17/19] KVM:x86: Enable guest CET supervisor xstate bit support | From | Paolo Bonzini <> |
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On 8/3/23 06:27, Yang Weijiang wrote: > if (boot_cpu_has(X86_FEATURE_XSAVES)) { > + u32 eax, ebx, ecx, edx; > + > + cpuid_count(0xd, 1, &eax, &ebx, &ecx, &edx); > rdmsrl(MSR_IA32_XSS, host_xss); > kvm_caps.supported_xss = host_xss & KVM_SUPPORTED_XSS; > + if (ecx & XFEATURE_MASK_CET_KERNEL) > + kvm_caps.supported_xss |= XFEATURE_MASK_CET_KERNEL; > }
This is a bit hackish and makes me lean more towards adding support for XFEATURE_MASK_CET_KERNEL in host MSR_IA32_XSS (and then possibly hide it in the actual calls to XSAVE/XRSTORS for non-guest FPU).
Paolo
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