1 files changed, 90 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/hyperv.h b/arch/x86/kvm/vmx/hyperv.h
new file mode 100644
index 000000000000..11a339009781
--- /dev/null
+++ b/arch/x86/kvm/vmx/hyperv.h
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __KVM_X86_VMX_HYPERV_H
+#define __KVM_X86_VMX_HYPERV_H
+
+#include <linux/kvm_host.h>
+#include "vmcs12.h"
+#include "vmx.h"
+
+#define EVMPTR_INVALID (-1ULL)
+#define EVMPTR_MAP_PENDING (-2ULL)
+
+enum nested_evmptrld_status {
+	EVMPTRLD_DISABLED,
+	EVMPTRLD_SUCCEEDED,
+	EVMPTRLD_VMFAIL,
+	EVMPTRLD_ERROR,
+};
+
+#ifdef CONFIG_KVM_HYPERV
+static inline bool evmptr_is_valid(u64 evmptr)
+{
+	return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
+}
+
+static inline bool nested_vmx_is_evmptr12_valid(struct vcpu_vmx *vmx)
+{
+	return evmptr_is_valid(vmx->nested.hv_evmcs_vmptr);
+}
+
+static inline bool evmptr_is_set(u64 evmptr)
+{
+	return evmptr != EVMPTR_INVALID;
+}
+
+static inline bool nested_vmx_is_evmptr12_set(struct vcpu_vmx *vmx)
+{
+	return evmptr_is_set(vmx->nested.hv_evmcs_vmptr);
+}
+
+static inline struct hv_enlightened_vmcs *nested_vmx_evmcs(struct vcpu_vmx *vmx)
+{
+	return vmx->nested.hv_evmcs;
+}
+
+static inline bool guest_cpu_cap_has_evmcs(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * eVMCS is exposed to the guest if Hyper-V is enabled in CPUID and
+	 * eVMCS has been explicitly enabled by userspace.
+	 */
+	return vcpu->arch.hyperv_enabled &&
+	       to_vmx(vcpu)->nested.enlightened_vmcs_enabled;
+}
+
+u64 nested_get_evmptr(struct kvm_vcpu *vcpu);
+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(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
+int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
+bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu);
+void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu);
+#else
+static inline bool evmptr_is_valid(u64 evmptr)
+{
+	return false;
+}
+
+static inline bool nested_vmx_is_evmptr12_valid(struct vcpu_vmx *vmx)
+{
+	return false;
+}
+
+static inline bool evmptr_is_set(u64 evmptr)
+{
+	return false;
+}
+
+static inline bool nested_vmx_is_evmptr12_set(struct vcpu_vmx *vmx)
+{
+	return false;
+}
+
+static inline struct hv_enlightened_vmcs *nested_vmx_evmcs(struct vcpu_vmx *vmx)
+{
+	return NULL;
+}
+#endif
+
+#endif /* __KVM_X86_VMX_HYPERV_H */