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KVM: MMU: Add locking around kvm_mmu_slot_remove_write_access()
author
Avi Kivity
<avi@qumranet.com>
Wed, 27 Aug 2008 13:32:24 +0000
(16:32 +0300)
committer
Avi Kivity
<avi@qumranet.com>
Wed, 15 Oct 2008 08:15:24 +0000
(10:15 +0200)
It was generally safe due to slots_lock being held for write, but it wasn't
very nice.
Signed-off-by: Avi Kivity <avi@qumranet.com>
arch/x86/kvm/mmu.c
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diff --git
a/arch/x86/kvm/mmu.c
b/arch/x86/kvm/mmu.c
index
a24da8f
..
5052acd
100644
(file)
--- a/
arch/x86/kvm/mmu.c
+++ b/
arch/x86/kvm/mmu.c
@@
-2097,6
+2097,7
@@
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
{
struct kvm_mmu_page *sp;
+ spin_lock(&kvm->mmu_lock);
list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) {
int i;
u64 *pt;
@@
-2110,6
+2111,7
@@
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
if (pt[i] & PT_WRITABLE_MASK)
pt[i] &= ~PT_WRITABLE_MASK;
}
+ spin_unlock(&kvm->mmu_lock);
}
void kvm_mmu_zap_all(struct kvm *kvm)