| Subject | Re: [PATCH v14 10/13] KVM: x86: Enable CET virtualization for VMX and advertise CET to userspace | From | Paolo Bonzini <> | Date | Thu, 28 Jan 2021 18:53:29 +0100 |
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On 06/11/20 02:16, Yang Weijiang wrote: > > + > + if (((cr4 ^ old_cr4) & X86_CR4_CET) && kvm_cet_supported()) { > + vmcs_writel(GUEST_SSP, 0); > + vmcs_writel(GUEST_S_CET, 0); > + vmcs_writel(GUEST_INTR_SSP_TABLE, 0); > + } > +
Is this behavior documented for bare metal? I suspect it is at least not true for S_CET and INTR_SSP_TABLE, because SMM entry does not save those to SMRAM (and clears CR4.CET).
Also, you need to save/restore GUEST_SSP to SMRAM.
Paolo
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