From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Date: Tue, 26 Mar 2019 22:46:03 +0000 (-0400)
Subject: Revert "KVM: VMX: introduce alloc_loaded_vmcs"
X-Git-Tag: v4.1.12-124.31.3~221
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=96c877539fbe03c31e110e047f1e332adfbe889a;p=users%2Fjedix%2Flinux-maple.git

Revert "KVM: VMX: introduce alloc_loaded_vmcs"

This reverts commit 8dd66ca98dfc03f7921ce5bf5926ce2d95507d84.

Revert due to performance regression.

Orabug: 29542029

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Mihai Carabas <mihai.carabas@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4b2c767216d7..633be63fd08d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3391,6 +3391,11 @@ static struct vmcs *alloc_vmcs_cpu(int cpu)
 	return vmcs;
 }
 
+static struct vmcs *alloc_vmcs(void)
+{
+	return alloc_vmcs_cpu(raw_smp_processor_id());
+}
+
 static void free_vmcs(struct vmcs *vmcs)
 {
 	free_pages((unsigned long)vmcs, vmcs_config.order);
@@ -3414,21 +3419,6 @@ static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
 		wrmsrl(MSR_IA32_PRED_CMD, FEATURE_SET_IBPB);
 }
 
-static struct vmcs *alloc_vmcs(void)
-{
-	return alloc_vmcs_cpu(raw_smp_processor_id());
-}
-
-static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
-{
-	loaded_vmcs->vmcs = alloc_vmcs();
-	if (!loaded_vmcs->vmcs)
-		return -ENOMEM;
-
-	loaded_vmcs_init(loaded_vmcs);
-	return 0;
-}
-
 static void free_kvm_area(void)
 {
 	int cpu;
@@ -6751,7 +6741,6 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
 	struct kvm_segment cs;
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 	struct vmcs *shadow_vmcs;
-	int r;
 	const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED
 		| FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
 
@@ -6793,9 +6782,10 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
 		return 1;
 	}
 
-	r = alloc_loaded_vmcs(&vmx->nested.vmcs02);
-	if (r < 0)
+	vmx->nested.vmcs02.vmcs = alloc_vmcs();
+	if (!vmx->nested.vmcs02.vmcs)
 		goto out_vmcs02;
+	loaded_vmcs_init(&vmx->nested.vmcs02);
 
 	if (cpu_has_vmx_msr_bitmap()) {
 		vmx->nested.msr_bitmap =
@@ -8710,10 +8700,15 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
 		goto uninit_vcpu;
 	}
 
-	err = alloc_loaded_vmcs(&vmx->vmcs01);
-	if (err < 0)
-		goto free_msrs;
 	vmx->loaded_vmcs = &vmx->vmcs01;
+	vmx->loaded_vmcs->vmcs = alloc_vmcs();
+	if (!vmx->loaded_vmcs->vmcs)
+		goto free_msrs;
+	if (!vmm_exclusive)
+		kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id())));
+	loaded_vmcs_init(vmx->loaded_vmcs);
+	if (!vmm_exclusive)
+		kvm_cpu_vmxoff();
 
 	cpu = get_cpu();
 	vmx_vcpu_load(&vmx->vcpu, cpu);