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From:   Tianyu Lan <Tianyu.Lan@microsoft.com>
CC:     Tianyu Lan <Tianyu.Lan@microsoft.com>,
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        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
        KY Srinivasan <kys@microsoft.com>,
        vkuznets <vkuznets@redhat.com>,
        Jork Loeser <Jork.Loeser@microsoft.com>
Subject: [PATCH V3 13/13] KVM/VMX: Add hv tlb range flush support
Thread-Topic: [PATCH V3 13/13] KVM/VMX: Add hv tlb range flush support
Thread-Index: AQHUVhUtzbG9wJFcUUe6aCZsyDBR8w==
Date:   Thu, 27 Sep 2018 03:50:06 +0000
Message-ID: <20180927034829.2230-14-Tianyu.Lan@microsoft.com>
References: <20180927034829.2230-1-Tianyu.Lan@microsoft.com>
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This patch is to register tlb_remote_flush_with_range callback with
hv tlb range flush interface.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
Change since v1:
       Pass flush range with new hyper-v tlb flush struct rather
than KVM tlb flush struct.
---
 arch/x86/kvm/vmx.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++---=
----
 1 file changed, 51 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2869c3e78168..70e1f916bfc9 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1555,7 +1555,43 @@ static void check_ept_pointer_match(struct kvm *kvm)
 	to_kvm_vmx(kvm)->ept_pointers_match =3D EPT_POINTERS_MATCH;
 }
=20
-static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
+int kvm_parse_flush_list_func(union hv_gpa_page_range gpa_list[],
+		int offset, struct list_head *flush_list,
+		int (*fill_flush_list)(union hv_gpa_page_range gpa_list[],
+		int offset, u64 start_gfn, u64 end_gfn))
+{
+	struct kvm_mmu_page *sp;
+
+	list_for_each_entry(sp, flush_list,
+			flush_link) {
+		offset =3D fill_flush_list(gpa_list, offset,
+				sp->gfn, KVM_PAGES_PER_HPAGE(sp->role.level));
+	}
+
+	return offset;
+}
+
+static inline int __hv_remote_flush_tlb_with_range(struct kvm *kvm,
+		struct kvm_vcpu *vcpu, struct kvm_tlb_range *range)
+{
+	u64 ept_pointer =3D to_vmx(vcpu)->ept_pointer;
+	struct hyperv_tlb_range flush_range;
+
+	if (range) {
+		flush_range.start_gfn =3D range->start_gfn;
+		flush_range.pages =3D range->pages;
+		flush_range.flush_list =3D range->flush_list;
+		flush_range.parse_flush_list_func =3D kvm_parse_flush_list_func;
+
+		return hyperv_flush_guest_mapping_range(ept_pointer,
+				&flush_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 =3D -ENOTSUPP, i;
@@ -1567,16 +1603,21 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
=20
 	if (to_kvm_vmx(kvm)->ept_pointers_match !=3D EPT_POINTERS_MATCH) {
 		kvm_for_each_vcpu(i, vcpu, kvm)
-			ret |=3D hyperv_flush_guest_mapping(
-				to_vmx(kvm_get_vcpu(kvm, i))->ept_pointer);
+			ret |=3D __hv_remote_flush_tlb_with_range(
+					kvm, vcpu, range);
 	} else {
-		ret =3D hyperv_flush_guest_mapping(
-				to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
+		ret =3D __hv_remote_flush_tlb_with_range(kvm,
+				kvm_get_vcpu(kvm, 0), range);
 	}
=20
 	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 +7959,11 @@ static __init int hardware_setup(void)
=20
 #if IS_ENABLED(CONFIG_HYPERV)
 	if (ms_hyperv.nested_features & HV_X64_NESTED_GUEST_MAPPING_FLUSH
-	    && enable_ept)
-		kvm_x86_ops->tlb_remote_flush =3D vmx_hv_remote_flush_tlb;
+	    && enable_ept) {
+		kvm_x86_ops->tlb_remote_flush =3D hv_remote_flush_tlb;
+		kvm_x86_ops->tlb_remote_flush_with_range =3D
+				hv_remote_flush_tlb_with_range;
+	}
 #endif
=20
 	if (!cpu_has_vmx_ple()) {
--=20
2.14.4