Messages in this thread | | | Subject | Re: [PATCH v15 14/14] KVM: x86: Save/Restore GUEST_SSP to/from SMRAM | From | Paolo Bonzini <> | Date | Wed, 3 Feb 2021 13:07:53 +0100 |
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On 03/02/21 12:34, Yang Weijiang wrote: > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 22eb6b8626a8..f63b713cd71f 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -8592,6 +8592,16 @@ static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf) > > for (i = 0; i < 6; i++) > enter_smm_save_seg_64(vcpu, buf, i); > + > + if (kvm_cet_supported()) { > + struct msr_data msr; > + > + msr.index = MSR_KVM_GUEST_SSP; > + msr.host_initiated = true; > + /* GUEST_SSP is stored in VMCS at vm-exit. */ > + kvm_x86_ops.get_msr(vcpu, &msr); > + put_smstate(u64, buf, 0x7ec8, msr.data); > + } > } > #endif > >
0x7ec8 is used for I/O instruction restart and auto-halt restart. 0x7f08 is a free spot. We should really document the KVM state save area format.
Paolo
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