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From: Vineeth Pillai <viremana@linux.microsoft.com>
To: Lan Tianyu <Tianyu.Lan@microsoft.com>,
	Michael Kelley <mikelley@microsoft.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	Wei Liu <wei.liu@kernel.org>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>
Cc: Vineeth Pillai <viremana@linux.microsoft.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	x86@kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Subject: [PATCH v2 5/7] KVM: SVM: hyper-v: Remote TLB flush for SVM
Date: Thu, 15 Apr 2021 13:43:40 +0000
Message-ID: <959f6cc899a17c709a2f5a71f6b2dc8c072ae600.1618492553.git.viremana@linux.microsoft.com> (raw)
In-Reply-To: <cover.1618492553.git.viremana@linux.microsoft.com>

Enable remote TLB flush for SVM.

Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
---
 arch/x86/kvm/svm/svm.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 2ad1f55c88d0..de141d5ae5fb 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -37,6 +37,7 @@
 #include <asm/spec-ctrl.h>
 #include <asm/cpu_device_id.h>
 #include <asm/traps.h>
+#include <asm/mshyperv.h>
 
 #include <asm/virtext.h>
 #include "trace.h"
@@ -44,6 +45,8 @@
 #include "svm.h"
 #include "svm_ops.h"
 
+#include "hyperv.h"
+
 #define __ex(x) __kvm_handle_fault_on_reboot(x)
 
 MODULE_AUTHOR("Qumranet");
@@ -931,6 +934,8 @@ static __init void svm_set_cpu_caps(void)
 		kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
 }
 
+static struct kvm_x86_ops svm_x86_ops;
+
 static __init int svm_hardware_setup(void)
 {
 	int cpu;
@@ -1000,6 +1005,16 @@ static __init int svm_hardware_setup(void)
 	kvm_configure_mmu(npt_enabled, get_max_npt_level(), PG_LEVEL_1G);
 	pr_info("kvm: Nested Paging %sabled\n", npt_enabled ? "en" : "dis");
 
+#if IS_ENABLED(CONFIG_HYPERV)
+	if (ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB
+	    && npt_enabled) {
+		pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n");
+		svm_x86_ops.tlb_remote_flush = kvm_hv_remote_flush_tlb;
+		svm_x86_ops.tlb_remote_flush_with_range =
+				kvm_hv_remote_flush_tlb_with_range;
+	}
+#endif
+
 	if (nrips) {
 		if (!boot_cpu_has(X86_FEATURE_NRIPS))
 			nrips = false;
@@ -1120,6 +1135,21 @@ static void svm_check_invpcid(struct vcpu_svm *svm)
 	}
 }
 
+#if IS_ENABLED(CONFIG_HYPERV)
+static void hv_init_vmcb(struct vmcb *vmcb)
+{
+	struct hv_enlightenments *hve = &vmcb->hv_enlightenments;
+
+	if (npt_enabled &&
+	    ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
+		hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
+}
+#else
+static inline void hv_init_vmcb(struct vmcb *vmcb)
+{
+}
+#endif
+
 static void init_vmcb(struct vcpu_svm *svm)
 {
 	struct vmcb_control_area *control = &svm->vmcb->control;
@@ -1282,6 +1312,8 @@ static void init_vmcb(struct vcpu_svm *svm)
 		}
 	}
 
+	hv_init_vmcb(svm->vmcb);
+
 	vmcb_mark_all_dirty(svm->vmcb);
 
 	enable_gif(svm);
@@ -3975,6 +4007,11 @@ static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long root,
 		svm->vmcb->control.nested_cr3 = cr3;
 		vmcb_mark_dirty(svm->vmcb, VMCB_NPT);
 
+#if IS_ENABLED(CONFIG_HYPERV)
+		if (kvm_x86_ops.tlb_remote_flush)
+			kvm_update_arch_tdp_pointer(vcpu->kvm, vcpu, cr3);
+#endif
+
 		/* Loading L2's CR3 is handled by enter_svm_guest_mode.  */
 		if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
 			return;
-- 
2.25.1


  parent reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-15 13:43 [PATCH v2 0/7] Hyper-V nested virt enlightenments " Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 1/7] hyperv: Detect Nested virtualization support " Vineeth Pillai
2021-04-16  8:26   ` Vitaly Kuznetsov
2021-04-16 16:10     ` Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 2/7] hyperv: SVM enlightened TLB flush support flag Vineeth Pillai
2021-04-21 10:00   ` Wei Liu
2021-04-21 11:15     ` Vineeth Pillai
2021-04-21 13:20       ` Wei Liu
2021-04-15 13:43 ` [PATCH v2 3/7] KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx Vineeth Pillai
2021-04-16  8:36   ` Vitaly Kuznetsov
2021-04-16  8:40     ` Paolo Bonzini
2021-04-16 16:39     ` Vineeth Pillai
2021-04-20 15:57       ` Vitaly Kuznetsov
2021-04-15 13:43 ` [PATCH v2 4/7] KVM: SVM: hyper-v: Nested enlightenments in VMCB Vineeth Pillai
2021-04-16  8:58   ` Vitaly Kuznetsov
2021-04-16 17:07     ` Vineeth Pillai
2021-04-15 13:43 ` Vineeth Pillai [this message]
2021-04-16  9:04   ` [PATCH v2 5/7] KVM: SVM: hyper-v: Remote TLB flush for SVM Vitaly Kuznetsov
2021-04-16 17:26     ` Vineeth Pillai
2021-04-21 14:03       ` Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 6/7] KVM: SVM: hyper-v: Enlightened MSR-Bitmap support Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 7/7] KVM: SVM: hyper-v: Direct Virtual Flush support Vineeth Pillai

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