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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Dan Cross <dcross@google.com>, Peter Shier <pshier@google.com>
Subject: [PATCH 4/7] KVM: nVMX: Move free_nested() below vmx_switch_vmcs()
Date: Tue, 14 Jul 2020 21:05:54 -0700	[thread overview]
Message-ID: <20200715040557.5889-5-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20200715040557.5889-1-sean.j.christopherson@intel.com>

Move free_nested() down below vmx_switch_vmcs() so that a future patch
can do an "emergency" invocation of vmx_switch_vmcs() if vmcs01 is not
the loaded VMCS when freeing nested resources.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/vmx/nested.c | 88 +++++++++++++++++++--------------------
 1 file changed, 44 insertions(+), 44 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 7d4457aaab2ef..e9b27c6478da3 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -233,50 +233,6 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 	vmx->nested.hv_evmcs = NULL;
 }
 
-/*
- * Free whatever needs to be freed from vmx->nested when L1 goes down, or
- * just stops using VMX.
- */
-static void free_nested(struct kvm_vcpu *vcpu)
-{
-	struct vcpu_vmx *vmx = to_vmx(vcpu);
-
-	if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon)
-		return;
-
-	kvm_clear_request(KVM_REQ_GET_VMCS12_PAGES, vcpu);
-
-	vmx->nested.vmxon = false;
-	vmx->nested.smm.vmxon = false;
-	free_vpid(vmx->nested.vpid02);
-	vmx->nested.posted_intr_nv = -1;
-	vmx->nested.current_vmptr = -1ull;
-	if (enable_shadow_vmcs) {
-		vmx_disable_shadow_vmcs(vmx);
-		vmcs_clear(vmx->vmcs01.shadow_vmcs);
-		free_vmcs(vmx->vmcs01.shadow_vmcs);
-		vmx->vmcs01.shadow_vmcs = NULL;
-	}
-	kfree(vmx->nested.cached_vmcs12);
-	vmx->nested.cached_vmcs12 = NULL;
-	kfree(vmx->nested.cached_shadow_vmcs12);
-	vmx->nested.cached_shadow_vmcs12 = NULL;
-	/* Unpin physical memory we referred to in the vmcs02 */
-	if (vmx->nested.apic_access_page) {
-		kvm_release_page_clean(vmx->nested.apic_access_page);
-		vmx->nested.apic_access_page = NULL;
-	}
-	kvm_vcpu_unmap(vcpu, &vmx->nested.virtual_apic_map, true);
-	kvm_vcpu_unmap(vcpu, &vmx->nested.pi_desc_map, true);
-	vmx->nested.pi_desc = NULL;
-
-	kvm_mmu_free_roots(vcpu, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
-
-	nested_release_evmcs(vcpu);
-
-	free_loaded_vmcs(&vmx->nested.vmcs02);
-}
-
 static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
 				     struct loaded_vmcs *prev)
 {
@@ -315,6 +271,50 @@ static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
 	vmx_register_cache_reset(vcpu);
 }
 
+/*
+ * Free whatever needs to be freed from vmx->nested when L1 goes down, or
+ * just stops using VMX.
+ */
+static void free_nested(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+	if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon)
+		return;
+
+	kvm_clear_request(KVM_REQ_GET_VMCS12_PAGES, vcpu);
+
+	vmx->nested.vmxon = false;
+	vmx->nested.smm.vmxon = false;
+	free_vpid(vmx->nested.vpid02);
+	vmx->nested.posted_intr_nv = -1;
+	vmx->nested.current_vmptr = -1ull;
+	if (enable_shadow_vmcs) {
+		vmx_disable_shadow_vmcs(vmx);
+		vmcs_clear(vmx->vmcs01.shadow_vmcs);
+		free_vmcs(vmx->vmcs01.shadow_vmcs);
+		vmx->vmcs01.shadow_vmcs = NULL;
+	}
+	kfree(vmx->nested.cached_vmcs12);
+	vmx->nested.cached_vmcs12 = NULL;
+	kfree(vmx->nested.cached_shadow_vmcs12);
+	vmx->nested.cached_shadow_vmcs12 = NULL;
+	/* Unpin physical memory we referred to in the vmcs02 */
+	if (vmx->nested.apic_access_page) {
+		kvm_release_page_clean(vmx->nested.apic_access_page);
+		vmx->nested.apic_access_page = NULL;
+	}
+	kvm_vcpu_unmap(vcpu, &vmx->nested.virtual_apic_map, true);
+	kvm_vcpu_unmap(vcpu, &vmx->nested.pi_desc_map, true);
+	vmx->nested.pi_desc = NULL;
+
+	kvm_mmu_free_roots(vcpu, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
+
+	nested_release_evmcs(vcpu);
+
+	free_loaded_vmcs(&vmx->nested.vmcs02);
+}
+
 /*
  * Ensure that the current vmcs of the logical processor is the
  * vmcs01 of the vcpu before calling free_nested().
-- 
2.26.0


  parent reply	other threads:[~2020-07-15  4:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  4:05 [PATCH 0/7] KVM: nVMX: Bug fixes and cleanup Sean Christopherson
2020-07-15  4:05 ` [PATCH 1/7] KVM: nVMX: Reset the segment cache when stuffing guest segs Sean Christopherson
2020-07-15  4:05 ` [PATCH 2/7] KVM: nVMX: Reload vmcs01 if getting vmcs12's pages fails Sean Christopherson
2020-07-15  4:05 ` [PATCH 3/7] KVM: nVMX: Explicitly check for valid guest state for !unrestricted guest Sean Christopherson
2020-07-15  4:05 ` Sean Christopherson [this message]
2020-07-15  4:05 ` [PATCH 5/7] KVM: nVMX: Ensure vmcs01 is the loaded VMCS when freeing nested state Sean Christopherson
2020-07-15  4:05 ` [PATCH 6/7] KVM: nVMX: Drop redundant VMCS switch and free_nested() call Sean Christopherson
2020-07-15  4:05 ` [PATCH 7/7] KVM: nVMX: WARN on attempt to switch the currently loaded VMCS Sean Christopherson

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