linux-kernel - [10/10] Revert: KVM: MMU: do not free active mmu pages in free_mmu

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Message-Id: <20100105194915.508413494@mini.kroah.org>
Date:	Tue, 05 Jan 2010 11:48:01 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	stable-review@...nel.org
Cc:	Gleb Natapov <gleb@...hat.com>, Avi Kivity <avi@...hat.com>
Subject: [10/10] Revert: KVM: MMU: do not free active mmu pages in free_mmu_pages()

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------
This reverts the commit d2127c8300fb1ec54af56faee17170e7a525326d, which was
the commit f00be0cae4e6ad0a8c7be381c6d9be3586800b3e upstream.

This was done based on comments saying it was causing problems.

Cc: Gleb Natapov <gleb@...hat.com>
Cc: Avi Kivity <avi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>


---
 arch/x86/kvm/mmu.c  |    8 ++++++++
 virt/kvm/kvm_main.c |    2 --
 2 files changed, 8 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1995,6 +1995,14 @@ EXPORT_SYMBOL_GPL(kvm_disable_tdp);
 
 static void free_mmu_pages(struct kvm_vcpu *vcpu)
 {
+	struct kvm_mmu_page *sp;
+
+	while (!list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
+		sp = container_of(vcpu->kvm->arch.active_mmu_pages.next,
+				  struct kvm_mmu_page, link);
+		kvm_mmu_zap_page(vcpu->kvm, sp);
+		cond_resched();
+	}
 	free_page((unsigned long)vcpu->arch.mmu.pae_root);
 }
 
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -406,8 +406,6 @@ static void kvm_destroy_vm(struct kvm *k
 #endif
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 	mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
-#else
-	kvm_arch_flush_shadow(kvm);
 #endif
 	kvm_arch_destroy_vm(kvm);
 	mmdrop(mm);


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