@@ -54,6 +54,7 @@
#define MSR_KVM_POLL_CONTROL 0x4b564d05
#define MSR_KVM_ASYNC_PF_INT 0x4b564d06
#define MSR_KVM_ASYNC_PF_ACK 0x4b564d07
+#define MSR_KVM_GUEST_SSP 0x4b564d08
struct kvm_steal_time {
__u64 steal;
@@ -1816,7 +1816,8 @@ static bool cet_is_ssp_msr_accessible(struct kvm_vcpu *vcpu,
if (msr->host_initiated)
return true;
- if (!guest_cpuid_has(vcpu, X86_FEATURE_SHSTK))
+ if (!guest_cpuid_has(vcpu, X86_FEATURE_SHSTK) ||
+ msr->index == MSR_KVM_GUEST_SSP)
return false;
if (msr->index == MSR_IA32_INT_SSP_TAB)
@@ -1994,6 +1995,11 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
return 1;
msr_info->data = vmcs_readl(GUEST_INTR_SSP_TABLE);
break;
+ case MSR_KVM_GUEST_SSP:
+ if (!cet_is_ssp_msr_accessible(vcpu, msr_info))
+ return 1;
+ msr_info->data = vmcs_readl(GUEST_SSP);
+ break;
case MSR_IA32_PL0_SSP ... MSR_IA32_PL3_SSP:
if (!cet_is_ssp_msr_accessible(vcpu, msr_info))
return 1;
@@ -2286,12 +2292,16 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
return 1;
vmcs_writel(GUEST_INTR_SSP_TABLE, data);
break;
+ case MSR_KVM_GUEST_SSP:
case MSR_IA32_PL0_SSP ... MSR_IA32_PL3_SSP:
if (!cet_is_ssp_msr_accessible(vcpu, msr_info))
return 1;
if ((data & GENMASK(2, 0)) || is_noncanonical_address(data, vcpu))
return 1;
- vmx_set_xsave_msr(msr_info);
+ if (msr_index == MSR_KVM_GUEST_SSP)
+ vmcs_writel(GUEST_SSP, data);
+ else
+ vmx_set_xsave_msr(msr_info);
break;
case MSR_TSC_AUX:
if (!msr_info->host_initiated &&