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-rw-r--r--arch/s390/kvm/kvm-s390.c35
1 files changed, 21 insertions, 14 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index ac6163c334d6..e5e8eb29e68e 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4524,21 +4524,28 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
- int rc;
-
- /* If the basics of the memslot do not change, we do not want
- * to update the gmap. Every update causes several unnecessary
- * segment translation exceptions. This is usually handled just
- * fine by the normal fault handler + gmap, but it will also
- * cause faults on the prefix page of running guest CPUs.
- */
- if (old->userspace_addr == mem->userspace_addr &&
- old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
- old->npages * PAGE_SIZE == mem->memory_size)
- return;
+ int rc = 0;
- rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
- mem->guest_phys_addr, mem->memory_size);
+ switch (change) {
+ case KVM_MR_DELETE:
+ rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
+ old->npages * PAGE_SIZE);
+ break;
+ case KVM_MR_MOVE:
+ rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE,
+ old->npages * PAGE_SIZE);
+ if (rc)
+ break;
+ /* FALLTHROUGH */
+ case KVM_MR_CREATE:
+ rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
+ mem->guest_phys_addr, mem->memory_size);
+ break;
+ case KVM_MR_FLAGS_ONLY:
+ break;
+ default:
+ WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
+ }
if (rc)
pr_warn("failed to commit memory region\n");
return;