kvm: Relax aligment check of kvm_set_phys_mem

There is no need to reject an unaligned memory region registration if the region will be I/O memory and it will not split an existing KVM slot. This fixes KVM support on PPC. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

kvm: Relax aligment check of kvm_set_phys_mem
There is no need to reject an unaligned memory region registration if the region will be I/O memory and it will not split an existing KVM slot. This fixes KVM support on PPC. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Jan Kiszka · Anthony Liguori
1 parent 582af0da
Showing 1 changed file with 9 additions and 1 deletions
kvm-all.c
@@ -583,7 +583,15 @@ void kvm_set_phys_mem(target_phys_addr_t start_addr,
     int err;
  
     if (start_addr & ~TARGET_PAGE_MASK) {
-        fprintf(stderr, "Only page-aligned memory slots supported\n");
+        if (flags >= IO_MEM_UNASSIGNED) {
+            if (!kvm_lookup_overlapping_slot(s, start_addr,
+                                             start_addr + size)) {
+                return;
+            }
+            fprintf(stderr, "Unaligned split of a KVM memory slot\n");
+        } else {
+            fprintf(stderr, "Only page-aligned memory slots supported\n");
+        }
         abort();
     }