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-rw-r--r--virt/kvm/kvm_main.c35
1 files changed, 12 insertions, 23 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 64c5dc37c6a1..2e93630b4add 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -754,7 +754,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
struct kvm_memory_slot *slot;
struct kvm_memory_slot old, new;
struct kvm_memslots *slots = NULL, *old_memslots;
- bool old_iommu_mapped;
enum kvm_mr_change change;
r = check_memory_region_flags(mem);
@@ -797,15 +796,14 @@ int __kvm_set_memory_region(struct kvm *kvm,
new.npages = npages;
new.flags = mem->flags;
- old_iommu_mapped = old.npages;
-
r = -EINVAL;
if (npages) {
if (!old.npages)
change = KVM_MR_CREATE;
else { /* Modify an existing slot. */
if ((mem->userspace_addr != old.userspace_addr) ||
- (npages != old.npages))
+ (npages != old.npages) ||
+ ((new.flags ^ old.flags) & KVM_MEM_READONLY))
goto out;
if (base_gfn != old.base_gfn)
@@ -867,7 +865,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
/* slot was deleted or moved, clear iommu mapping */
kvm_iommu_unmap_pages(kvm, &old);
- old_iommu_mapped = false;
/* From this point no new shadow pages pointing to a deleted,
* or moved, memslot will be created.
*
@@ -898,25 +895,17 @@ int __kvm_set_memory_region(struct kvm *kvm,
/*
* IOMMU mapping: New slots need to be mapped. Old slots need to be
- * un-mapped and re-mapped if their base changes or if flags that the
- * iommu cares about change (read-only). Base change unmapping is
- * handled above with slot deletion, so we only unmap incompatible
- * flags here. Anything else the iommu might care about for existing
- * slots (size changes, userspace addr changes) is disallowed above,
- * so any other attribute changes getting here can be skipped.
+ * un-mapped and re-mapped if their base changes. Since base change
+ * unmapping is handled above with slot deletion, mapping alone is
+ * needed here. Anything else the iommu might care about for existing
+ * slots (size changes, userspace addr changes and read-only flag
+ * changes) is disallowed above, so any other attribute changes getting
+ * here can be skipped.
*/
- if (change != KVM_MR_DELETE) {
- if (old_iommu_mapped &&
- ((new.flags ^ old.flags) & KVM_MEM_READONLY)) {
- kvm_iommu_unmap_pages(kvm, &old);
- old_iommu_mapped = false;
- }
-
- if (!old_iommu_mapped) {
- r = kvm_iommu_map_pages(kvm, &new);
- if (r)
- goto out_slots;
- }
+ if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
+ r = kvm_iommu_map_pages(kvm, &new);
+ if (r)
+ goto out_slots;
}
/* actual memory is freed via old in kvm_free_physmem_slot below */