linux-kernel - [PATCH 8/10] KVM MMU: allow more page become unsync at getting sp time

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Date:	Thu, 22 Apr 2010 14:13:37 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 8/10] KVM MMU: allow more page become unsync at getting sp
 time

Allow more page become asynchronous at getting sp time, if need create new
shadow page for gfn but it not allow unsync(level > 0), we should unsync all
gfn's unsync page

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 arch/x86/kvm/mmu.c |   22 ++++++++++++++++++++--
 1 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 13378e7..e0bb4d8 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1199,6 +1199,23 @@ static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
 	return 0;
 }
 
+static void kvm_sync_pages(struct kvm_vcpu *vcpu,  gfn_t gfn)
+{
+	struct hlist_head *bucket;
+	struct kvm_mmu_page *s;
+	struct hlist_node *node, *n;
+	unsigned index;
+
+	index = kvm_page_table_hashfn(gfn);
+	bucket = &vcpu->kvm->arch.mmu_page_hash[index];
+	hlist_for_each_entry_safe(s, node, n, bucket, hash_link) {
+		if (s->gfn != gfn || !s->unsync)
+			continue;
+		WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL);
+		kvm_sync_page(vcpu, s, true);
+	}
+}
+
 struct mmu_page_path {
 	struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1];
 	unsigned int idx[PT64_ROOT_LEVEL-1];
@@ -1334,8 +1351,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 			trace_kvm_mmu_get_page(sp, false);
 			return sp;
 		}
-	if (unsync_sp)
-		kvm_sync_page(vcpu, unsync_sp, true);
+
+	if (!direct && level > PT_PAGE_TABLE_LEVEL && unsync_sp)
+		kvm_sync_pages(vcpu, gfn);
 
 	++vcpu->kvm->stat.mmu_cache_miss;
 	sp = kvm_mmu_alloc_page(vcpu, parent_pte);
-- 
1.6.1.2


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