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authorAlex Williamson <alex.williamson@redhat.com>2012-12-10 10:32:57 -0700
committerMarcelo Tosatti <mtosatti@redhat.com>2012-12-13 23:21:52 -0200
commite40f193f5bb022e927a57a4f5d5194e4f12ddb74 (patch)
treeb40ba3bafaf75eb6f27e41164b213cda708c7605 /virt
parent9c695d42dbd465bcaa865603b411a73c60e60978 (diff)
downloadlinux-e40f193f5bb022e927a57a4f5d5194e4f12ddb74.tar.gz
KVM: Fix iommu map/unmap to handle memory slot moves
The iommu integration into memory slots expects memory slots to be added or removed and doesn't handle the move case. We can unmap slots from the iommu after we mark them invalid and map them before installing the final memslot array. Also re-order the kmemdup vs map so we don't leave iommu mappings if we get ENOMEM. Reviewed-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e4d358195e5..9a56ca2fa25 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -822,6 +822,8 @@ int __kvm_set_memory_region(struct kvm *kvm,
old_memslots = kvm->memslots;
rcu_assign_pointer(kvm->memslots, slots);
synchronize_srcu_expedited(&kvm->srcu);
+ /* slot was deleted or moved, clear iommu mapping */
+ kvm_iommu_unmap_pages(kvm, &old);
/* From this point no new shadow pages pointing to a deleted,
* or moved, memslot will be created.
*
@@ -837,20 +839,19 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (r)
goto out_free;
- /* map/unmap the pages in iommu page table */
- if (npages) {
- r = kvm_iommu_map_pages(kvm, &new);
- if (r)
- goto out_free;
- } else
- kvm_iommu_unmap_pages(kvm, &old);
-
r = -ENOMEM;
slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
GFP_KERNEL);
if (!slots)
goto out_free;
+ /* map new memory slot into the iommu */
+ if (npages) {
+ r = kvm_iommu_map_pages(kvm, &new);
+ if (r)
+ goto out_slots;
+ }
+
/* actual memory is freed via old in kvm_free_physmem_slot below */
if (!npages) {
new.dirty_bitmap = NULL;
@@ -869,6 +870,8 @@ int __kvm_set_memory_region(struct kvm *kvm,
return 0;
+out_slots:
+ kfree(slots);
out_free:
kvm_free_physmem_slot(&new, &old);
out: