diff options
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 5fcd401a5897..5b5b69c97665 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1749,6 +1749,12 @@ static void kvm_commit_memory_region(struct kvm *kvm, kvm_free_memslot(kvm, old); break; case KVM_MR_MOVE: + /* + * Moving a guest_memfd memslot isn't supported, and will never + * be supported. + */ + WARN_ON_ONCE(old->flags & KVM_MEM_GUEST_MEMFD); + fallthrough; case KVM_MR_FLAGS_ONLY: /* * Free the dirty bitmap as needed; the below check encompasses @@ -1758,6 +1764,15 @@ static void kvm_commit_memory_region(struct kvm *kvm, kvm_destroy_dirty_bitmap(old); /* + * Unbind the guest_memfd instance as needed; the @new slot has + * already created its own binding. TODO: Drop the WARN when + * dirty logging guest_memfd memslots is supported. Until then, + * flags-only changes on guest_memfd slots should be impossible. + */ + if (WARN_ON_ONCE(old->flags & KVM_MEM_GUEST_MEMFD)) + kvm_gmem_unbind(old); + + /* * The final quirk. Free the detached, old slot, but only its * memory, not any metadata. Metadata, including arch specific * data, may be reused by @new. @@ -2086,7 +2101,7 @@ static int kvm_set_memory_region(struct kvm *kvm, return -EINVAL; if ((mem->userspace_addr != old->userspace_addr) || (npages != old->npages) || - ((mem->flags ^ old->flags) & KVM_MEM_READONLY)) + ((mem->flags ^ old->flags) & (KVM_MEM_READONLY | KVM_MEM_GUEST_MEMFD))) return -EINVAL; if (base_gfn != old->base_gfn) |