From 5419369ed6bd4cf711fdda5e52a5999b940413f5 Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Thu, 29 Nov 2012 14:07:59 -0700 Subject: [PATCH] KVM: Fix user memslot overlap check Prior to memory slot sorting this loop compared all of the user memory slots for overlap with new entries. With memory slot sorting, we're just checking some number of entries in the array that may or may not be user slots. Instead, walk all the slots with kvm_for_each_memslot, which has the added benefit of terminating early when we hit the first empty slot, and skip comparison to private slots. Cc: stable@vger.kernel.org Signed-off-by: Alex Williamson Signed-off-by: Marcelo Tosatti --- virt/kvm/kvm_main.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index e6cfd4344d2..1cd693a76a5 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -714,8 +714,7 @@ int __kvm_set_memory_region(struct kvm *kvm, int r; gfn_t base_gfn; unsigned long npages; - unsigned long i; - struct kvm_memory_slot *memslot; + struct kvm_memory_slot *memslot, *slot; struct kvm_memory_slot old, new; struct kvm_memslots *slots, *old_memslots; @@ -766,13 +765,11 @@ int __kvm_set_memory_region(struct kvm *kvm, /* Check for overlaps */ r = -EEXIST; - for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { - struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; - - if (s == memslot || !s->npages) + kvm_for_each_memslot(slot, kvm->memslots) { + if (slot->id >= KVM_MEMORY_SLOTS || slot == memslot) continue; - if (!((base_gfn + npages <= s->base_gfn) || - (base_gfn >= s->base_gfn + s->npages))) + if (!((base_gfn + npages <= slot->base_gfn) || + (base_gfn >= slot->base_gfn + slot->npages))) goto out_free; }