[PATCH] accel/kvm: check for KVM_CAP_MULTI_ADDRESS_SPACE on vm

[Paolo Bonzini <pbonzini@redhat.com>]

KVM_CAP_MULTI_ADDRESS_SPACE used to be a global capability, but with the
introduction of AMD SEV-SNP confidential VMs, the number of address spaces
can vary by VM type.

Query the extension on the VM level instead of on the KVM level.

Inspired by an analogous patch by Tom Dohrmann.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 accel/kvm/kvm-all.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 8be731cfeed..4287e254df8 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2618,12 +2618,6 @@ static int kvm_init(MachineState *ms)
         s->nr_slots_max = KVM_MEMSLOTS_NR_MAX_DEFAULT;
     }
 
-    s->nr_as = kvm_check_extension(s, KVM_CAP_MULTI_ADDRESS_SPACE);
-    if (s->nr_as <= 1) {
-        s->nr_as = 1;
-    }
-    s->as = g_new0(struct KVMAs, s->nr_as);
-
     type = find_kvm_machine_type(ms);
     if (type < 0) {
         ret = -EINVAL;
@@ -2637,6 +2631,12 @@ static int kvm_init(MachineState *ms)
 
     s->vmfd = ret;
 
+    s->nr_as = kvm_vm_check_extension(s, KVM_CAP_MULTI_ADDRESS_SPACE);
+    if (s->nr_as <= 1) {
+        s->nr_as = 1;
+    }
+    s->as = g_new0(struct KVMAs, s->nr_as);
+
     /* check the vcpu limits */
     soft_vcpus_limit = kvm_recommended_vcpus(s);
     hard_vcpus_limit = kvm_max_vcpus(s);
-- 
2.46.2