linux-kernel - [PATCH 13/13] KVM/VMX: Add hv tlb range flush support

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Message-ID: <20180910083806.65177-14-Tianyu.Lan@microsoft.com>
Date:   Mon, 10 Sep 2018 08:39:46 +0000
From:   Tianyu Lan <Tianyu.Lan@...rosoft.com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        vkuznets <vkuznets@...hat.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>
Subject: [PATCH 13/13] KVM/VMX: Add hv tlb range flush support

This patch is to register tlb_remote_flush_with_range callback with
hv tlb range flush interface.

Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
---
 arch/x86/kvm/vmx.c | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3f9ccbafd0d8..ae904693b14f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1555,7 +1555,19 @@ static void check_ept_pointer_match(struct kvm *kvm)
 	to_kvm_vmx(kvm)->ept_pointers_match = EPT_POINTERS_MATCH;
 }
 
-static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
+static inline int __hv_remote_flush_tlb_with_range(struct kvm *kvm,
+		struct kvm_vcpu *vcpu, struct kvm_tlb_range *range)
+{
+	u64 ept_pointer = to_vmx(vcpu)->ept_pointer;
+
+	if (range)
+		return hyperv_flush_guest_mapping_range(ept_pointer, range);
+	else
+		return hyperv_flush_guest_mapping(ept_pointer);
+}
+
+static int hv_remote_flush_tlb_with_range(struct kvm *kvm,
+		struct kvm_tlb_range *range)
 {
 	struct kvm_vcpu *vcpu;
 	int ret = -ENOTSUPP, i;
@@ -1567,16 +1579,21 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
 
 	if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {
 		kvm_for_each_vcpu(i, vcpu, kvm)
-			ret |= hyperv_flush_guest_mapping(
-				to_vmx(kvm_get_vcpu(kvm, i))->ept_pointer);
+			ret |= __hv_remote_flush_tlb_with_range(
+					kvm, vcpu, range);
 	} else {
-		ret = hyperv_flush_guest_mapping(
-				to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
+		ret = __hv_remote_flush_tlb_with_range(kvm,
+				kvm_get_vcpu(kvm, 0), range);
 	}
 
 	spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
 	return ret;
 }
+
+static int hv_remote_flush_tlb(struct kvm *kvm)
+{
+	return hv_remote_flush_tlb_with_range(kvm, NULL);
+}
 #else /* !IS_ENABLED(CONFIG_HYPERV) */
 static inline void evmcs_write64(unsigned long field, u64 value) {}
 static inline void evmcs_write32(unsigned long field, u32 value) {}
@@ -7918,8 +7935,11 @@ static __init int hardware_setup(void)
 
 #if IS_ENABLED(CONFIG_HYPERV)
 	if (ms_hyperv.nested_features & HV_X64_NESTED_GUEST_MAPPING_FLUSH
-	    && enable_ept)
-		kvm_x86_ops->tlb_remote_flush = vmx_hv_remote_flush_tlb;
+	    && enable_ept) {
+		kvm_x86_ops->tlb_remote_flush = hv_remote_flush_tlb;
+		kvm_x86_ops->tlb_remote_flush_with_range =
+				hv_remote_flush_tlb_with_range;
+	}
 #endif
 
 	if (!cpu_has_vmx_ple()) {
-- 
2.14.4