linux-kernel - [PATCH V3 3/10] KVM/MMU: Introduce tlb flush with range list

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Message-Id: <20190222150637.2337-4-Tianyu.Lan@microsoft.com>
Date:   Fri, 22 Feb 2019 23:06:30 +0800
From:   lantianyu1986@...il.com
To:     unlisted-recipients:; (no To-header on input)
Cc:     Lan Tianyu <Tianyu.Lan@...rosoft.com>, christoffer.dall@....com,
        marc.zyngier@....com, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com, jhogan@...nel.org,
        ralf@...ux-mips.org, paul.burton@...s.com, paulus@...abs.org,
        benh@...nel.crashing.org, mpe@...erman.id.au, pbonzini@...hat.com,
        rkrcmar@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm@...r.kernel.org, michael.h.kelley@...rosoft.com,
        kys@...rosoft.com, vkuznets@...hat.com
Subject: [PATCH V3 3/10] KVM/MMU: Introduce tlb flush with range list

From: Lan Tianyu <Tianyu.Lan@...rosoft.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@...rosoft.com>
---
 arch/x86/kvm/mmu.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8d43b7c0f56f..7a862c56b954 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -291,6 +291,20 @@ 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 hlist_head *flush_list)
+{
+	struct kvm_tlb_range range;
+
+	if (hlist_empty(flush_list))
+		return;
+
+	range.flush_list = flush_list;
 
 	kvm_flush_remote_tlbs_with_range(kvm, &range);
 }
@@ -2719,6 +2733,7 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
 				    struct list_head *invalid_list)
 {
 	struct kvm_mmu_page *sp, *nsp;
+	HLIST_HEAD(flush_list);
 
 	if (list_empty(invalid_list))
 		return;
@@ -2732,7 +2747,14 @@ 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)
+				hlist_add_head(&sp->flush_link, &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