linux-kernel - [PATCH 09/15] KVM: MMU: split kvm_mmu_free

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Date:	Tue, 07 Jun 2011 21:03:42 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: [PATCH 09/15] KVM: MMU: split kvm_mmu_free_page

Split kvm_mmu_free_page to kvm_mmu_free_lock_parts and
kvm_mmu_free_unlock_parts

One is used to free the parts which is under mmu lock and the other is
used to free the parts which can allow be freed out of mmu lock

It is used by later patch

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 arch/x86/kvm/mmu.c |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 43e7ca1..9f3a746 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1039,17 +1039,27 @@ static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr)
 	percpu_counter_add(&kvm_total_used_mmu_pages, nr);
 }
 
-static void kvm_mmu_free_page(struct kvm_mmu_page *sp)
+static void kvm_mmu_free_lock_parts(struct kvm_mmu_page *sp)
 {
 	ASSERT(is_empty_shadow_page(sp->spt));
 	hlist_del(&sp->hash_link);
-	list_del(&sp->link);
-	free_page((unsigned long)sp->spt);
 	if (!sp->role.direct)
 		free_page((unsigned long)sp->gfns);
+}
+
+static void kvm_mmu_free_unlock_parts(struct kvm_mmu_page *sp)
+{
+	list_del(&sp->link);
+	free_page((unsigned long)sp->spt);
 	kmem_cache_free(mmu_page_header_cache, sp);
 }
 
+static void kvm_mmu_free_page(struct kvm_mmu_page *sp)
+{
+	kvm_mmu_free_lock_parts(sp);
+	kvm_mmu_free_unlock_parts(sp);
+}
+
 static unsigned kvm_page_table_hashfn(gfn_t gfn)
 {
 	return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1);
-- 
1.7.4.4

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