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KVM: MMU: Fix rmap_write_protect() hugepage iteration bug
author
Marcelo Tosatti
<mtosatti@redhat.com>
Sun, 8 Jun 2008 04:48:53 +0000
(
01:48
-0300)
committer
Avi Kivity
<avi@qumranet.com>
Tue, 24 Jun 2008 09:17:10 +0000
(12:17 +0300)
rmap_next() does not work correctly after rmap_remove(), as it expects
the rmap chains not to change during iteration. Fix (for now) by restarting
iteration from the beginning.
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
ee3f530
..
9628091
100644
(file)
--- a/
arch/x86/kvm/mmu.c
+++ b/
arch/x86/kvm/mmu.c
@@
-640,6
+640,7
@@
static void rmap_write_protect(struct kvm *kvm, u64 gfn)
rmap_remove(kvm, spte);
--kvm->stat.lpages;
set_shadow_pte(spte, shadow_trap_nonpresent_pte);
+ spte = NULL;
write_protected = 1;
}
spte = rmap_next(kvm, rmapp, spte);