accel/kvm: check for KVM_CAP_MEMORY_ATTRIBUTES on vm

The exact set of available memory attributes can vary by VM.  In the
future it might vary depending on enabled capabilities, too.  Query the
extension on the VM level instead of on the KVM level, and only after
architecture-specific initialization.

Inspired by an analogous patch by Tom Dohrmann.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index d985486a053a616f5c66f596e5e4c77c6a8c2a8d..801cff16a5a2e8092c8df9a43457ccb33aad3e8f 100644 (file)
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2604,12 +2604,6 @@ static int kvm_init(MachineState *ms)
         goto err;
     }
 
-    kvm_supported_memory_attributes = kvm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES);
-    kvm_guest_memfd_supported =
-        kvm_check_extension(s, KVM_CAP_GUEST_MEMFD) &&
-        kvm_check_extension(s, KVM_CAP_USER_MEMORY2) &&
-        (kvm_supported_memory_attributes & KVM_MEMORY_ATTRIBUTE_PRIVATE);
-
     kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT);
     s->nr_slots_max = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
 
@@ -2723,6 +2717,12 @@ static int kvm_init(MachineState *ms)
         goto err;
     }
 
+    kvm_supported_memory_attributes = kvm_vm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES);
+    kvm_guest_memfd_supported =
+        kvm_check_extension(s, KVM_CAP_GUEST_MEMFD) &&
+        kvm_check_extension(s, KVM_CAP_USER_MEMORY2) &&
+        (kvm_supported_memory_attributes & KVM_MEMORY_ATTRIBUTE_PRIVATE);
+
     if (s->kernel_irqchip_split == ON_OFF_AUTO_AUTO) {
         s->kernel_irqchip_split = mc->default_kernel_irqchip_split ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
     }