[PATCH 4/11] KVM/MMU: Introduce tlb flush with range list

From: lantianyu1986@gmail.com
To: unlisted-recipients:; (no To-header on input)
Cc: Lan Tianyu <Tianyu.Lan@microsoft.com>,
	christoffer.dall@arm.com, marc.zyngier@arm.com,
	linux@armlinux.org.uk, catalin.marinas@arm.com,
	will.deacon@arm.com, jhogan@kernel.org, ralf@linux-mips.org,
	paul.burton@mips.com, paulus@ozlabs.org,
	benh@kernel.crashing.org, mpe@ellerman.id.au,
	pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org,
	michael.h.kelley@microsoft.com, kys@microsoft.com,
	vkuznets@redhat.com
Subject: [PATCH 4/11] KVM/MMU: Introduce tlb flush with range list
Date: Fri,  4 Jan 2019 16:53:58 +0800	[thread overview]
Message-ID: <20190104085405.40356-5-Tianyu.Lan@microsoft.com> (raw)
In-Reply-To: <20190104085405.40356-1-Tianyu.Lan@microsoft.com>

From: Lan Tianyu <Tianyu.Lan@microsoft.com>

This patch is to introduce tlb flush with range list interface and use
struct kvm_mmu_page as list entry. Use flush list function in the
kvm_mmu_commit_zap_page().

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
 arch/x86/include/asm/kvm_host.h |  7 +++++++
 arch/x86/kvm/mmu.c              | 24 +++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 78d2a6714c3b..22dbaa8fba32 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -316,6 +316,12 @@ struct kvm_rmap_head {
 
 struct kvm_mmu_page {
 	struct list_head link;
+
+	/*
+	 * Tlb flush with range list uses struct kvm_mmu_page as list entry
+	 * and all list operations should be under protection of mmu_lock.
+	 */
+	struct list_head flush_link;
 	struct hlist_node hash_link;
 	bool unsync;
 
@@ -443,6 +449,7 @@ struct kvm_mmu {
 struct kvm_tlb_range {
 	u64 start_gfn;
 	u64 pages;
+	struct list_head *flush_list;
 };
 
 enum pmc_type {
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 068694fa2371..d3272c5066ea 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -289,6 +289,17 @@ static void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
 
 	range.start_gfn = start_gfn;
 	range.pages = pages;
+	range.flush_list = NULL;
+
+	kvm_flush_remote_tlbs_with_range(kvm, &range);
+}
+
+static void kvm_flush_remote_tlbs_with_list(struct kvm *kvm,
+		struct list_head *flush_list)
+{
+	struct kvm_tlb_range range;
+
+	range.flush_list = flush_list;
 
 	kvm_flush_remote_tlbs_with_range(kvm, &range);
 }
@@ -2708,6 +2719,7 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
 				    struct list_head *invalid_list)
 {
 	struct kvm_mmu_page *sp, *nsp;
+	LIST_HEAD(flush_list);
 
 	if (list_empty(invalid_list))
 		return;
@@ -2721,7 +2733,17 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
 	 * In addition, kvm_flush_remote_tlbs waits for all vcpus to exit
 	 * guest mode and/or lockless shadow page table walks.
 	 */
-	kvm_flush_remote_tlbs(kvm);
+	if (kvm_available_flush_tlb_with_range()) {
+		list_for_each_entry(sp, invalid_list, link)
+			if (sp->sptep && is_last_spte(*sp->sptep,
+			    sp->role.level))
+				list_add(&sp->flush_link, &flush_list);
+
+		if (!list_empty(&flush_list))
+			kvm_flush_remote_tlbs_with_list(kvm, &flush_list);
+	} else {
+		kvm_flush_remote_tlbs(kvm);
+	}
 
 	list_for_each_entry_safe(sp, nsp, invalid_list, link) {
 		WARN_ON(!sp->role.invalid || sp->root_count);
-- 
2.14.4

