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From:   Vitaly Kuznetsov <vkuznets@redhat.com>
To:     kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <seanjc@google.com>
Cc:     linux-kernel@vger.kernel.org
Subject: [PATCH RFC 07/11] KVM: x86: Make Hyper-V emulation optional
Date:   Tue, 10 Oct 2023 18:02:56 +0200
Message-ID: <20231010160300.1136799-8-vkuznets@redhat.com>
In-Reply-To: <20231010160300.1136799-1-vkuznets@redhat.com>
References: <20231010160300.1136799-1-vkuznets@redhat.com>
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Hyper-V emulation in KVM is a fairly big chunk and in some cases it may be
desirable to not compile it in to reduce module sizes as well as attack
surface. Introduce CONFIG_KVM_HYPERV option to make it possible.

Note, there's room for further nVMX/nSVM code optimizations when
!CONFIG_KVM_HYPERV, this will be done in follow-up patches.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/include/asm/kvm_host.h |  4 +++
 arch/x86/kvm/Kconfig            |  9 ++++++
 arch/x86/kvm/Makefile           | 17 +++++++---
 arch/x86/kvm/cpuid.c            |  6 ++++
 arch/x86/kvm/hyperv.h           | 29 +++++++++++++++--
 arch/x86/kvm/irq_comm.c         |  9 +++++-
 arch/x86/kvm/svm/hyperv.h       |  7 +++++
 arch/x86/kvm/svm/nested.c       |  2 ++
 arch/x86/kvm/svm/svm_onhyperv.h |  2 ++
 arch/x86/kvm/vmx/hyperv.h       |  8 +++++
 arch/x86/kvm/vmx/nested.c       | 17 ++++++++++
 arch/x86/kvm/x86.c              | 56 +++++++++++++++++++++++----------
 12 files changed, 143 insertions(+), 23 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 711dc880a9f0..b0a55b736b47 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1085,6 +1085,7 @@ enum hv_tsc_page_status {
 	HV_TSC_PAGE_BROKEN,
 };
 
+#ifdef CONFIG_KVM_HYPERV
 /* Hyper-V emulation context */
 struct kvm_hv {
 	struct mutex hv_lock;
@@ -1117,6 +1118,7 @@ struct kvm_hv {
 
 	struct kvm_hv_syndbg hv_syndbg;
 };
+#endif
 
 struct msr_bitmap_range {
 	u32 flags;
@@ -1338,7 +1340,9 @@ struct kvm_arch {
 	/* reads protected by irq_srcu, writes by irq_lock */
 	struct hlist_head mask_notifier_list;
 
+#ifdef CONFIG_KVM_HYPERV
 	struct kvm_hv hyperv;
+#endif
 
 #ifdef CONFIG_KVM_XEN
 	struct kvm_xen xen;
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index ed90f148140d..a06e19a8a8f6 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -129,6 +129,15 @@ config KVM_SMM
 
 	  If unsure, say Y.
 
+config KVM_HYPERV
+	bool "Support for Microsoft Hyper-V emulation"
+	depends on KVM
+	default y
+	help
+	  Provides KVM support for emulating Microsoft Hypervisor (Hyper-V).
+
+	  If unsure, say "Y".
+
 config KVM_XEN
 	bool "Support for Xen hypercall interface"
 	depends on KVM
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 8ea872401cd6..ccd477178f07 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -11,7 +11,7 @@ include $(srctree)/virt/kvm/Makefile.kvm
 
 kvm-y			+= x86.o emulate.o i8259.o irq.o lapic.o \
 			   i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
-			   hyperv.o debugfs.o mmu/mmu.o mmu/page_track.o \
+			   debugfs.o mmu/mmu.o mmu/page_track.o \
 			   mmu/spte.o
 
 ifdef CONFIG_HYPERV
@@ -19,19 +19,28 @@ kvm-y			+= kvm_onhyperv.o
 endif
 
 kvm-$(CONFIG_X86_64) += mmu/tdp_iter.o mmu/tdp_mmu.o
+kvm-$(CONFIG_KVM_HYPERV) += hyperv.o
 kvm-$(CONFIG_KVM_XEN)	+= xen.o
 kvm-$(CONFIG_KVM_SMM)	+= smm.o
 
 kvm-intel-y		+= vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
-			   vmx/hyperv.o vmx/hyperv_evmcs.o vmx/nested.o vmx/posted_intr.o
+			   vmx/nested.o vmx/posted_intr.o
+ifdef CONFIG_KVM_HYPERV
+kvm-intel-y		+= vmx/hyperv.o vmx/hyperv_evmcs.o
+endif
+
 kvm-intel-$(CONFIG_X86_SGX_KVM)	+= vmx/sgx.o
 
 ifdef CONFIG_HYPERV
-kvm-intel-y		+= vmx/vmx_onhyperv.o
+kvm-intel-y		+= vmx/vmx_onhyperv.o vmx/hyperv_evmcs.o
 endif
 
 kvm-amd-y		+= svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o \
-			   svm/sev.o svm/hyperv.o
+			   svm/sev.o
+
+ifdef CONFIG_KVM_HYPERV
+kvm-amd-y		+= svm/hyperv.o
+endif
 
 ifdef CONFIG_HYPERV
 kvm-amd-y		+= svm/svm_onhyperv.o
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 0544e30b4946..7a3533573f94 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -314,11 +314,15 @@ EXPORT_SYMBOL_GPL(kvm_update_cpuid_runtime);
 
 static bool kvm_cpuid_has_hyperv(struct kvm_cpuid_entry2 *entries, int nent)
 {
+#ifdef CONFIG_KVM_HYPERV
 	struct kvm_cpuid_entry2 *entry;
 
 	entry = cpuid_entry2_find(entries, nent, HYPERV_CPUID_INTERFACE,
 				  KVM_CPUID_INDEX_NOT_SIGNIFICANT);
 	return entry && entry->eax == HYPERV_CPUID_SIGNATURE_EAX;
+#else
+	return false;
+#endif
 }
 
 static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
@@ -441,11 +445,13 @@ static int kvm_set_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 *e2,
 		return 0;
 	}
 
+#ifdef CONFIG_KVM_HYPERV
 	if (kvm_cpuid_has_hyperv(e2, nent)) {
 		r = kvm_hv_vcpu_init(vcpu);
 		if (r)
 			return r;
 	}
+#endif
 
 	r = kvm_check_cpuid(vcpu, e2, nent);
 	if (r)
diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
index ddb1d0b019e6..3a6acd8a9fa8 100644
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h
@@ -24,6 +24,8 @@
 #include <linux/kvm_host.h>
 #include "x86.h"
 
+#ifdef CONFIG_KVM_HYPERV
+
 /* "Hv#1" signature */
 #define HYPERV_CPUID_SIGNATURE_EAX 0x31237648
 
@@ -247,5 +249,28 @@ static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu)
 }
 
 int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);
-
-#endif
+#else /* CONFIG_KVM_HYPERV */
+static inline void kvm_hv_setup_tsc_page(struct kvm *kvm,
+					 struct pvclock_vcpu_time_info *hv_clock) {}
+static inline void kvm_hv_request_tsc_page_update(struct kvm *kvm) {}
+static inline void kvm_hv_init_vm(struct kvm *kvm) {}
+static inline void kvm_hv_destroy_vm(struct kvm *kvm) {}
+static inline int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) { return 0; }
+static inline void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu) {}
+static inline bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu) { return false; }
+static inline int kvm_hv_hypercall(struct kvm_vcpu *vcpu) { return HV_STATUS_ACCESS_DENIED; }
+static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) {}
+static inline void kvm_hv_free_pa_page(struct kvm *kvm) {}
+static inline bool kvm_hv_synic_has_vector(struct kvm_vcpu *vcpu, int vector) { return false; }
+static inline bool kvm_hv_synic_auto_eoi_set(struct kvm_vcpu *vcpu, int vector) { return false; }
+static inline void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector) {}
+static inline bool kvm_hv_invtsc_suppressed(struct kvm_vcpu *vcpu) { return false; }
+static inline void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu, bool hyperv_enabled) {}
+static inline bool kvm_hv_has_stimer_pending(struct kvm_vcpu *vcpu) { return false; }
+static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) { return false; }
+static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu) { return false; }
+static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu) { return 0; }
+static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu) { return vcpu->vcpu_idx; }
+#endif /* CONFIG_KVM_HYPERV */
+
+#endif /* __ARCH_X86_KVM_HYPERV_H__ */
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 16d076a1b91a..68f3f6c26046 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -144,7 +144,7 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
 	return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
 }
 
-
+#ifdef CONFIG_KVM_HYPERV
 static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
 		    struct kvm *kvm, int irq_source_id, int level,
 		    bool line_status)
@@ -154,6 +154,7 @@ static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
 
 	return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint);
 }
+#endif
 
 int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
 			      struct kvm *kvm, int irq_source_id, int level,
@@ -163,9 +164,11 @@ int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
 	int r;
 
 	switch (e->type) {
+#ifdef CONFIG_KVM_HYPERV
 	case KVM_IRQ_ROUTING_HV_SINT:
 		return kvm_hv_set_sint(e, kvm, irq_source_id, level,
 				       line_status);
+#endif
 
 	case KVM_IRQ_ROUTING_MSI:
 		if (kvm_msi_route_invalid(kvm, e))
@@ -314,11 +317,13 @@ int kvm_set_routing_entry(struct kvm *kvm,
 		if (kvm_msi_route_invalid(kvm, e))
 			return -EINVAL;
 		break;
+#ifdef CONFIG_KVM_HYPERV
 	case KVM_IRQ_ROUTING_HV_SINT:
 		e->set = kvm_hv_set_sint;
 		e->hv_sint.vcpu = ue->u.hv_sint.vcpu;
 		e->hv_sint.sint = ue->u.hv_sint.sint;
 		break;
+#endif
 #ifdef CONFIG_KVM_XEN
 	case KVM_IRQ_ROUTING_XEN_EVTCHN:
 		return kvm_xen_setup_evtchn(kvm, e, ue);
@@ -438,5 +443,7 @@ void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
 
 void kvm_arch_irq_routing_update(struct kvm *kvm)
 {
+#ifdef CONFIG_KVM_HYPERV
 	kvm_hv_irq_routing_update(kvm);
+#endif
 }
diff --git a/arch/x86/kvm/svm/hyperv.h b/arch/x86/kvm/svm/hyperv.h
index 02f4784b5d44..14eec2d9b6be 100644
--- a/arch/x86/kvm/svm/hyperv.h
+++ b/arch/x86/kvm/svm/hyperv.h
@@ -11,6 +11,7 @@
 #include "../hyperv.h"
 #include "svm.h"
 
+#ifdef CONFIG_KVM_HYPERV
 static inline void nested_svm_hv_update_vm_vp_ids(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
@@ -41,5 +42,11 @@ static inline bool nested_svm_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu)
 }
 
 void svm_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu);
+#else /* CONFIG_KVM_HYPERV */
+static inline void nested_svm_hv_update_vm_vp_ids(struct kvm_vcpu *vcpu) {}
+static inline bool nested_svm_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu) { return false; }
+static inline void svm_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu) {}
+#endif /* CONFIG_KVM_HYPERV */
+
 
 #endif /* __ARCH_X86_KVM_SVM_HYPERV_H__ */
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index dd496c9e5f91..4d8cd378a30b 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -487,6 +487,7 @@ static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm,
 
 static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
 {
+#ifdef CONFIG_KVM_HYPERV
 	/*
 	 * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or
 	 * L2's VP_ID upon request from the guest. Make sure we check for
@@ -495,6 +496,7 @@ static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
 	 */
 	if (to_hv_vcpu(vcpu) && npt_enabled)
 		kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);
+#endif
 
 	/*
 	 * TODO: optimize unconditional TLB flush/MMU sync.  A partial list of
diff --git a/arch/x86/kvm/svm/svm_onhyperv.h b/arch/x86/kvm/svm/svm_onhyperv.h
index f85bc617ffe4..c25cf56e6adb 100644
--- a/arch/x86/kvm/svm/svm_onhyperv.h
+++ b/arch/x86/kvm/svm/svm_onhyperv.h
@@ -79,6 +79,7 @@ static inline void svm_hv_vmcb_dirty_nested_enlightenments(
 
 static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu)
 {
+#ifdef CONFIG_KVM_HYPERV
 	struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments;
 	u32 vp_index = kvm_hv_get_vpindex(vcpu);
 
@@ -86,6 +87,7 @@ static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu)
 		hve->hv_vp_id = vp_index;
 		vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
 	}
+#endif
 }
 #else
 
diff --git a/arch/x86/kvm/vmx/hyperv.h b/arch/x86/kvm/vmx/hyperv.h
index d4ed99008518..933ef6cad5e6 100644
--- a/arch/x86/kvm/vmx/hyperv.h
+++ b/arch/x86/kvm/vmx/hyperv.h
@@ -20,6 +20,7 @@ enum nested_evmptrld_status {
 	EVMPTRLD_ERROR,
 };
 
+#ifdef CONFIG_KVM_HYPERV
 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,
@@ -28,5 +29,12 @@ void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *
 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 u64 nested_get_evmptr(struct kvm_vcpu *vcpu) { return EVMPTR_INVALID; }
+static inline void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) {}
+static inline bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu) { return false; }
+static inline int nested_evmcs_check_controls(struct vmcs12 *vmcs12) { return 0; }
+#endif
+
 
 #endif /* __KVM_X86_VMX_HYPERV_H */
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index c5ec0ef51ff7..ca7e06759aa3 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -226,6 +226,7 @@ static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx)
 
 static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 {
+#ifdef CONFIG_KVM_HYPERV
 	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 
@@ -241,6 +242,7 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 		hv_vcpu->nested.vm_id = 0;
 		hv_vcpu->nested.vp_id = 0;
 	}
+#endif
 }
 
 static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
@@ -1139,6 +1141,7 @@ static void nested_vmx_transition_tlb_flush(struct kvm_vcpu *vcpu,
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 
+#ifdef CONFIG_KVM_HYPERV
 	/*
 	 * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or
 	 * L2's VP_ID upon request from the guest. Make sure we check for
@@ -1147,6 +1150,7 @@ static void nested_vmx_transition_tlb_flush(struct kvm_vcpu *vcpu,
 	 */
 	if (to_hv_vcpu(vcpu) && enable_ept)
 		kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);
+#endif
 
 	/*
 	 * If vmcs12 doesn't use VPID, L1 expects linear and combined mappings
@@ -1576,6 +1580,7 @@ static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx)
 	vmcs_load(vmx->loaded_vmcs->vmcs);
 }
 
+#ifdef CONFIG_KVM_HYPERV
 static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields)
 {
 	struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
@@ -2083,6 +2088,10 @@ static enum nested_evmptrld_status nested_vmx_handle_enlightened_vmptrld(
 
 	return EVMPTRLD_SUCCEEDED;
 }
+#else /* CONFIG_KVM_HYPERV */
+static inline void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields) {}
+static inline void copy_vmcs12_to_enlightened(struct vcpu_vmx *vmx) {}
+#endif /* CONFIG_KVM_HYPERV */
 
 void nested_sync_vmcs12_to_shadow(struct kvm_vcpu *vcpu)
 {
@@ -3161,6 +3170,7 @@ static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+#ifdef CONFIG_KVM_HYPERV
 static bool nested_get_evmcs_page(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -3188,6 +3198,9 @@ static bool nested_get_evmcs_page(struct kvm_vcpu *vcpu)
 
 	return true;
 }
+#else
+static bool nested_get_evmcs_page(struct kvm_vcpu *vcpu) { return true; }
+#endif
 
 static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
 {
@@ -3558,11 +3571,13 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
 	if (!nested_vmx_check_permission(vcpu))
 		return 1;
 
+#ifdef CONFIG_KVM_HYPERV
 	evmptrld_status = nested_vmx_handle_enlightened_vmptrld(vcpu, launch);
 	if (evmptrld_status == EVMPTRLD_ERROR) {
 		kvm_queue_exception(vcpu, UD_VECTOR);
 		return 1;
 	}
+#endif
 
 	kvm_pmu_trigger_event(vcpu, PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
 
@@ -7096,7 +7111,9 @@ struct kvm_x86_nested_ops vmx_nested_ops = {
 	.set_state = vmx_set_nested_state,
 	.get_nested_state_pages = vmx_get_nested_state_pages,
 	.write_log_dirty = nested_vmx_write_pml_buffer,
+#ifdef CONFIG_KVM_HYPERV
 	.enable_evmcs = nested_enable_evmcs,
 	.get_evmcs_version = nested_get_evmcs_version,
 	.hv_inject_synthetic_vmexit_post_tlb_flush = vmx_hv_inject_synthetic_vmexit_post_tlb_flush,
+#endif
 };
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e273ce8e0b3f..78e18d28bc61 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1504,6 +1504,8 @@ static unsigned num_msrs_to_save;
 static const u32 emulated_msrs_all[] = {
 	MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 	MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
+
+#ifdef CONFIG_KVM_HYPERV
 	HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
 	HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC,
 	HV_X64_MSR_TSC_FREQUENCY, HV_X64_MSR_APIC_FREQUENCY,
@@ -1521,6 +1523,7 @@ static const u32 emulated_msrs_all[] = {
 	HV_X64_MSR_SYNDBG_CONTROL, HV_X64_MSR_SYNDBG_STATUS,
 	HV_X64_MSR_SYNDBG_SEND_BUFFER, HV_X64_MSR_SYNDBG_RECV_BUFFER,
 	HV_X64_MSR_SYNDBG_PENDING_BUFFER,
+#endif
 
 	MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
 	MSR_KVM_PV_EOI_EN, MSR_KVM_ASYNC_PF_INT, MSR_KVM_ASYNC_PF_ACK,
@@ -3914,6 +3917,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		 * the need to ignore the workaround.
 		 */
 		break;
+#ifdef CONFIG_KVM_HYPERV
 	case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
 	case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
 	case HV_X64_MSR_SYNDBG_OPTIONS:
@@ -3926,6 +3930,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 	case HV_X64_MSR_TSC_INVARIANT_CONTROL:
 		return kvm_hv_set_msr_common(vcpu, msr, data,
 					     msr_info->host_initiated);
+#endif
 	case MSR_IA32_BBL_CR_CTL3:
 		/* Drop writes to this legacy MSR -- see rdmsr
 		 * counterpart for further detail.
@@ -4270,6 +4275,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		 */
 		msr_info->data = 0x20000000;
 		break;
+#ifdef CONFIG_KVM_HYPERV
 	case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
 	case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
 	case HV_X64_MSR_SYNDBG_OPTIONS:
@@ -4283,6 +4289,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		return kvm_hv_get_msr_common(vcpu,
 					     msr_info->index, &msr_info->data,
 					     msr_info->host_initiated);
+#endif
 	case MSR_IA32_BBL_CR_CTL3:
 		/* This legacy MSR exists but isn't fully documented in current
 		 * silicon.  It is however accessed by winxp in very narrow
@@ -4420,6 +4427,7 @@ static inline bool kvm_can_mwait_in_guest(void)
 		boot_cpu_has(X86_FEATURE_ARAT);
 }
 
+#ifdef CONFIG_KVM_HYPERV
 static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
 					    struct kvm_cpuid2 __user *cpuid_arg)
 {
@@ -4440,6 +4448,7 @@ static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
 
 	return 0;
 }
+#endif
 
 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 {
@@ -4764,9 +4773,11 @@ long kvm_arch_dev_ioctl(struct file *filp,
 	case KVM_GET_MSRS:
 		r = msr_io(NULL, argp, do_get_msr_feature, 1);
 		break;
+#ifdef CONFIG_KVM_HYPERV
 	case KVM_GET_SUPPORTED_HV_CPUID:
 		r = kvm_ioctl_get_supported_hv_cpuid(NULL, argp);
 		break;
+#endif
 	case KVM_GET_DEVICE_ATTR: {
 		struct kvm_device_attr attr;
 		r = -EFAULT;
@@ -5580,14 +5591,11 @@ static int kvm_vcpu_ioctl_device_attr(struct kvm_vcpu *vcpu,
 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 				     struct kvm_enable_cap *cap)
 {
-	int r;
-	uint16_t vmcs_version;
-	void __user *user_ptr;
-
 	if (cap->flags)
 		return -EINVAL;
 
 	switch (cap->cap) {
+#ifdef CONFIG_KVM_HYPERV
 	case KVM_CAP_HYPERV_SYNIC2:
 		if (cap->args[0])
 			return -EINVAL;
@@ -5599,16 +5607,22 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 		return kvm_hv_activate_synic(vcpu, cap->cap ==
 					     KVM_CAP_HYPERV_SYNIC2);
 	case KVM_CAP_HYPERV_ENLIGHTENED_VMCS:
-		if (!kvm_x86_ops.nested_ops->enable_evmcs)
-			return -ENOTTY;
-		r = kvm_x86_ops.nested_ops->enable_evmcs(vcpu, &vmcs_version);
-		if (!r) {
-			user_ptr = (void __user *)(uintptr_t)cap->args[0];
-			if (copy_to_user(user_ptr, &vmcs_version,
-					 sizeof(vmcs_version)))
-				r = -EFAULT;
+		{
+			int r;
+			uint16_t vmcs_version;
+			void __user *user_ptr;
+
+			if (!kvm_x86_ops.nested_ops->enable_evmcs)
+				return -ENOTTY;
+			r = kvm_x86_ops.nested_ops->enable_evmcs(vcpu, &vmcs_version);
+			if (!r) {
+				user_ptr = (void __user *)(uintptr_t)cap->args[0];
+				if (copy_to_user(user_ptr, &vmcs_version,
+						 sizeof(vmcs_version)))
+					r = -EFAULT;
+			}
+			return r;
 		}
-		return r;
 	case KVM_CAP_HYPERV_DIRECT_TLBFLUSH:
 		if (!kvm_x86_ops.enable_l2_tlb_flush)
 			return -ENOTTY;
@@ -5617,6 +5631,7 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 
 	case KVM_CAP_HYPERV_ENFORCE_CPUID:
 		return kvm_hv_set_enforce_cpuid(vcpu, cap->args[0]);
+#endif
 
 	case KVM_CAP_ENFORCE_PV_FEATURE_CPUID:
 		vcpu->arch.pv_cpuid.enforce = cap->args[0];
@@ -6009,9 +6024,11 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 		srcu_read_unlock(&vcpu->kvm->srcu, idx);
 		break;
 	}
+#ifdef CONFIG_KVM_HYPERV
 	case KVM_GET_SUPPORTED_HV_CPUID:
 		r = kvm_ioctl_get_supported_hv_cpuid(vcpu, argp);
 		break;
+#endif
 #ifdef CONFIG_KVM_XEN
 	case KVM_XEN_VCPU_GET_ATTR: {
 		struct kvm_xen_vcpu_attr xva;
@@ -7066,6 +7083,7 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		r = static_call(kvm_x86_mem_enc_unregister_region)(kvm, &region);
 		break;
 	}
+#ifdef CONFIG_KVM_HYPERV
 	case KVM_HYPERV_EVENTFD: {
 		struct kvm_hyperv_eventfd hvevfd;
 
@@ -7075,6 +7093,7 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		r = kvm_vm_ioctl_hv_eventfd(kvm, &hvevfd);
 		break;
 	}
+#endif
 	case KVM_SET_PMU_EVENT_FILTER:
 		r = kvm_vm_ioctl_set_pmu_event_filter(kvm, argp);
 		break;
@@ -10445,19 +10464,20 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
 
 static void vcpu_load_eoi_exitmap(struct kvm_vcpu *vcpu)
 {
-	u64 eoi_exit_bitmap[4];
-
 	if (!kvm_apic_hw_enabled(vcpu->arch.apic))
 		return;
 
+#ifdef CONFIG_KVM_HYPERV
 	if (to_hv_vcpu(vcpu)) {
+		u64 eoi_exit_bitmap[4];
+
 		bitmap_or((ulong *)eoi_exit_bitmap,
 			  vcpu->arch.ioapic_handled_vectors,
 			  to_hv_synic(vcpu)->vec_bitmap, 256);
 		static_call_cond(kvm_x86_load_eoi_exitmap)(vcpu, eoi_exit_bitmap);
 		return;
 	}
-
+#endif
 	static_call_cond(kvm_x86_load_eoi_exitmap)(
 		vcpu, (u64 *)vcpu->arch.ioapic_handled_vectors);
 }
@@ -10548,9 +10568,11 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		 * the flushes are considered "remote" and not "local" because
 		 * the requests can be initiated from other vCPUs.
 		 */
+#ifdef CONFIG_KVM_HYPERV
 		if (kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu) &&
 		    kvm_hv_vcpu_flush_tlb(vcpu))
 			kvm_vcpu_flush_tlb_guest(vcpu);
+#endif
 
 		if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
 			vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
@@ -10603,6 +10625,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 			vcpu_load_eoi_exitmap(vcpu);
 		if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu))
 			kvm_vcpu_reload_apic_access_page(vcpu);
+#ifdef CONFIG_KVM_HYPERV
 		if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) {
 			vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
 			vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH;
@@ -10633,6 +10656,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		 */
 		if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu))
 			kvm_hv_process_stimers(vcpu);
+#endif
 		if (kvm_check_request(KVM_REQ_APICV_UPDATE, vcpu))
 			kvm_vcpu_update_apicv(vcpu);
 		if (kvm_check_request(KVM_REQ_APF_READY, vcpu))
-- 
2.41.0