return 0;
}
+void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata)
+{
+ u32 ctl_low = (u32)*pdata;
+ u32 ctl_high = (u32)(*pdata >> 32);
+
+ /*
+ * Hyper-V 2016 and 2019 try using these features even when eVMCS
+ * is enabled but there are no corresponding fields.
+ */
+ switch (msr_index) {
+ case MSR_IA32_VMX_EXIT_CTLS:
+ case MSR_IA32_VMX_TRUE_EXIT_CTLS:
+ ctl_high &= ~VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
+ break;
+ case MSR_IA32_VMX_ENTRY_CTLS:
+ case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
+ ctl_high &= ~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
+ break;
+ case MSR_IA32_VMX_PROCBASED_CTLS2:
+ ctl_high &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
+ break;
+ }
+
+ *pdata = ctl_low | ((u64)ctl_high << 32);
+}
+
int nested_enable_evmcs(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version)
{
if (vmcs_version)
*vmcs_version = nested_get_evmcs_version(vcpu);
- vmx->nested.msrs.pinbased_ctls_high &= ~EVMCS1_UNSUPPORTED_PINCTRL;
- vmx->nested.msrs.entry_ctls_high &= ~EVMCS1_UNSUPPORTED_VMENTRY_CTRL;
- vmx->nested.msrs.exit_ctls_high &= ~EVMCS1_UNSUPPORTED_VMEXIT_CTRL;
- vmx->nested.msrs.secondary_ctls_high &= ~EVMCS1_UNSUPPORTED_2NDEXEC;
- vmx->nested.msrs.vmfunc_controls &= ~EVMCS1_UNSUPPORTED_VMFUNC;
-
return 0;
}
uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
int nested_enable_evmcs(struct kvm_vcpu *vcpu,
uint16_t *vmcs_version);
+void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata);
#endif /* __KVM_X86_VMX_EVMCS_H */
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
if (!nested_vmx_allowed(vcpu))
return 1;
- return vmx_get_vmx_msr(&vmx->nested.msrs, msr_info->index,
- &msr_info->data);
+ if (vmx_get_vmx_msr(&vmx->nested.msrs, msr_info->index,
+ &msr_info->data))
+ return 1;
+ /*
+ * Enlightened VMCS v1 doesn't have certain fields, but buggy
+ * Hyper-V versions are still trying to use corresponding
+ * features when they are exposed. Filter out the essential
+ * minimum.
+ */
+ if (!msr_info->host_initiated &&
+ vmx->nested.enlightened_vmcs_enabled)
+ nested_evmcs_filter_control_msr(msr_info->index,
+ &msr_info->data);
+ break;
case MSR_IA32_RTIT_CTL:
if (pt_mode != PT_MODE_HOST_GUEST)
return 1;