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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 09/11] KVM: nVMX: hyper-v: Introduce nested_vmx_evmcs() accessor
Date:   Tue, 10 Oct 2023 18:02:58 +0200
Message-ID: <20231010160300.1136799-10-vkuznets@redhat.com>
In-Reply-To: <20231010160300.1136799-1-vkuznets@redhat.com>
References: <20231010160300.1136799-1-vkuznets@redhat.com>
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There's a number of 'vmx->nested.hv_evmcs' accesses in nested.c, introduce
'nested_vmx_evmcs()' accessor to hide them all in !CONFIG_KVM_HYPERV case.

No functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/kvm/vmx/hyperv.h |  8 ++++++++
 arch/x86/kvm/vmx/nested.c | 33 ++++++++++++++++++---------------
 2 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kvm/vmx/hyperv.h b/arch/x86/kvm/vmx/hyperv.h
index 6ca5c8c5be9c..b07131a23250 100644
--- a/arch/x86/kvm/vmx/hyperv.h
+++ b/arch/x86/kvm/vmx/hyperv.h
@@ -25,6 +25,10 @@ struct vcpu_vmx;
 
 #ifdef CONFIG_KVM_HYPERV
 static inline gpa_t nested_vmx_evmptr(struct vcpu_vmx *vmx) { return vmx->nested.hv_evmcs_vmptr; }
+static inline struct hv_enlightened_vmcs *nested_vmx_evmcs(struct vcpu_vmx *vmx)
+{
+	return vmx->nested.hv_evmcs;
+}
 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,
@@ -35,6 +39,10 @@ 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 gpa_t nested_vmx_evmptr(struct vcpu_vmx *vmx) { return EVMPTR_INVALID; };
+static inline struct hv_enlightened_vmcs *nested_vmx_evmcs(struct vcpu_vmx *vmx)
+{
+	return NULL;
+}
 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; }
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index e6476f8e2ccd..d539904d8f1e 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -574,7 +574,6 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
 	int msr;
 	unsigned long *msr_bitmap_l1;
 	unsigned long *msr_bitmap_l0 = vmx->nested.vmcs02.msr_bitmap;
-	struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
 	struct kvm_host_map *map = &vmx->nested.msr_bitmap_map;
 
 	/* Nothing to do if the MSR bitmap is not in use.  */
@@ -590,10 +589,13 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
 	 * - Nested hypervisor (L1) has enabled 'Enlightened MSR Bitmap' feature
 	 *   and tells KVM (L0) there were no changes in MSR bitmap for L2.
 	 */
-	if (!vmx->nested.force_msr_bitmap_recalc && evmcs &&
-	    evmcs->hv_enlightenments_control.msr_bitmap &&
-	    evmcs->hv_clean_fields & HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP)
-		return true;
+	if (!vmx->nested.force_msr_bitmap_recalc) {
+		struct hv_enlightened_vmcs *evmcs = nested_vmx_evmcs(vmx);
+
+		if (evmcs && evmcs->hv_enlightenments_control.msr_bitmap &&
+		    evmcs->hv_clean_fields & HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP)
+			return true;
+	}
 
 	if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->msr_bitmap), map))
 		return false;
@@ -1584,7 +1586,7 @@ static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx)
 static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields)
 {
 	struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
-	struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
+	struct hv_enlightened_vmcs *evmcs = nested_vmx_evmcs(vmx);
 	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(&vmx->vcpu);
 
 	/* HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE */
@@ -1828,7 +1830,7 @@ static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields
 static void copy_vmcs12_to_enlightened(struct vcpu_vmx *vmx)
 {
 	struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
-	struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
+	struct hv_enlightened_vmcs *evmcs = nested_vmx_evmcs(vmx);
 
 	/*
 	 * Should not be changed by KVM:
@@ -2412,7 +2414,7 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct loaded_vmcs *vmcs0
 
 static void prepare_vmcs02_rare(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
 {
-	struct hv_enlightened_vmcs *hv_evmcs = vmx->nested.hv_evmcs;
+	struct hv_enlightened_vmcs *hv_evmcs = nested_vmx_evmcs(vmx);
 
 	if (!hv_evmcs || !(hv_evmcs->hv_clean_fields &
 			   HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP2)) {
@@ -2544,6 +2546,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
 			  enum vm_entry_failure_code *entry_failure_code)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	struct hv_enlightened_vmcs *evmcs = nested_vmx_evmcs(vmx);
 	bool load_guest_pdptrs_vmcs12 = false;
 
 	if (vmx->nested.dirty_vmcs12 || evmptr_is_valid(nested_vmx_evmptr(vmx))) {
@@ -2551,8 +2554,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
 		vmx->nested.dirty_vmcs12 = false;
 
 		load_guest_pdptrs_vmcs12 = !evmptr_is_valid(nested_vmx_evmptr(vmx)) ||
-			!(vmx->nested.hv_evmcs->hv_clean_fields &
-			  HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1);
+			!(evmcs->hv_clean_fields & HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1);
 	}
 
 	if (vmx->nested.nested_run_pending &&
@@ -2674,8 +2676,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
 	 * here.
 	 */
 	if (evmptr_is_valid(nested_vmx_evmptr(vmx)))
-		vmx->nested.hv_evmcs->hv_clean_fields |=
-			HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
+		evmcs->hv_clean_fields |= HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
 
 	return 0;
 }
@@ -3600,7 +3601,9 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
 		return nested_vmx_failInvalid(vcpu);
 
 	if (evmptr_is_valid(nested_vmx_evmptr(vmx))) {
-		copy_enlightened_to_vmcs12(vmx, vmx->nested.hv_evmcs->hv_clean_fields);
+		struct hv_enlightened_vmcs *evmcs = nested_vmx_evmcs(vmx);
+
+		copy_enlightened_to_vmcs12(vmx, evmcs->hv_clean_fields);
 		/* Enlightened VMCS doesn't have launch state */
 		vmcs12->launch_state = !launch;
 	} else if (enable_shadow_vmcs) {
@@ -5335,7 +5338,7 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
 					   vmptr + offsetof(struct vmcs12,
 							    launch_state),
 					   &zero, sizeof(zero));
-	} else if (vmx->nested.hv_evmcs && vmptr == nested_vmx_evmptr(vmx)) {
+	} else if (nested_vmx_evmcs(vmx) && vmptr == nested_vmx_evmptr(vmx)) {
 		nested_release_evmcs(vcpu);
 	}
 
@@ -5413,7 +5416,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
 			return nested_vmx_fail(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
 
 		/* Read the field, zero-extended to a u64 value */
-		value = evmcs_read_any(vmx->nested.hv_evmcs, field, offset);
+		value = evmcs_read_any(nested_vmx_evmcs(vmx), field, offset);
 	}
 
 	/*
-- 
2.41.0