linux-kernel - [PATCH v3 11/15] KVM: MMU: locklessly access shadow page under rcu protection

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Date:	Wed, 23 Oct 2013 21:29:29 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	gleb@...hat.com
Cc:	avi.kivity@...il.com, mtosatti@...hat.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Subject: [PATCH v3 11/15] KVM: MMU: locklessly access shadow page under rcu protection

Use SLAB_DESTROY_BY_RCU to prevent the shadow page to be freed from the
slab, so that it can be locklessly accessed by holding rcu lock

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 arch/x86/kvm/mmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 1bcc8c8..5b42858 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4710,8 +4710,8 @@ int kvm_mmu_module_init(void)
 		goto nomem;
 
 	mmu_shadow_page_cache = kmem_cache_create("mmu_shadow_page_cache",
-						  PAGE_SIZE, PAGE_SIZE, 0,
-						  init_shadow_page_table);
+				   PAGE_SIZE, PAGE_SIZE, SLAB_DESTROY_BY_RCU,
+				   init_shadow_page_table);
 	if (!mmu_shadow_page_cache)
 		goto nomem;
 
-- 
1.8.1.4

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