@@ -923,7 +923,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
unsigned long npages;
struct kvm_memory_slot *slot;
struct kvm_memory_slot old, new;
- struct kvm_memslots *slots = NULL, *old_memslots;
+ struct kvm_memslots *slots;
int as_id, id;
enum kvm_mr_change change;
@@ -1031,7 +1031,13 @@ int __kvm_set_memory_region(struct kvm *kvm,
slot = id_to_memslot(slots, id);
slot->flags |= KVM_MEMSLOT_INVALID;
- old_memslots = install_new_memslots(kvm, as_id, slots);
+ /*
+ * We can re-use the old memslots, the only difference from the
+ * newly installed memslots is the invalid flag, which will get
+ * dropped by update_memslots anyway. We'll also revert to the
+ * old memslots if preparing the new memory region fails.
+ */
+ slots = install_new_memslots(kvm, as_id, slots);
/* From this point no new shadow pages pointing to a deleted,
* or moved, memslot will be created.
@@ -1041,13 +1047,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
* - kvm_is_visible_gfn (mmu_check_roots)
*/
kvm_arch_flush_shadow_memslot(kvm, slot);
-
- /*
- * We can re-use the old_memslots from above, the only difference
- * from the currently installed memslots is the invalid flag. This
- * will get overwritten by update_memslots anyway.
- */
- slots = old_memslots;
}
r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
@@ -1061,15 +1060,17 @@ int __kvm_set_memory_region(struct kvm *kvm,
}
update_memslots(slots, &new, change);
- old_memslots = install_new_memslots(kvm, as_id, slots);
+ slots = install_new_memslots(kvm, as_id, slots);
kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
kvm_free_memslot(kvm, &old, &new);
- kvfree(old_memslots);
+ kvfree(slots);
return 0;
out_slots:
+ if (change == KVM_MR_DELETE || change == KVM_MR_MOVE)
+ slots = install_new_memslots(kvm, as_id, slots);
kvfree(slots);
out_free:
kvm_free_memslot(kvm, &new, &old);
Reinstall the old memslots if preparing the new memory region fails after invalidating a to-be-{re}moved memslot. Remove the superfluous 'old_memslots' variable so that it's somewhat clear that the error handling path needs to free the unused memslots, not simply the 'old' memslots. Fixes: bc6678a33d9b9 ("KVM: introduce kvm->srcu and convert kvm_set_memory_region to SRCU update") Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> --- virt/kvm/kvm_main.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-)