[PULL 24/39] accel: kvm: Fix kvm_type invocation

[Peter Maydell]

From: Andrew Jones <drjones@redhat.com>

Prior to commit f2ce39b4f067 a MachineClass kvm_type method
only needed to be registered to ensure it would be executed.
With commit f2ce39b4f067 a kvm-type machine property must also
be specified. hw/arm/virt relies on the kvm_type method to pass
its selected IPA limit to KVM, but this is not exposed as a
machine property. Restore the previous functionality of invoking
kvm_type when it's present.

Fixes: f2ce39b4f067 ("vl: make qemu_get_machine_opts static")
Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20210310135218.255205-2-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/hw/boards.h | 1 +
 accel/kvm/kvm-all.c | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/hw/boards.h b/include/hw/boards.h
index 5fda5fd128d..4a90549ad85 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -128,6 +128,7 @@ typedef struct {
  * @kvm_type:
  *    Return the type of KVM corresponding to the kvm-type string option or
  *    computed based on other criteria such as the host kernel capabilities.
+ *    kvm-type may be NULL if it is not needed.
  * @numa_mem_supported:
  *    true if '--numa node.mem' option is supported and false otherwise
  * @smp_parse:
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index f88a52393fe..37b0a1861e7 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2068,6 +2068,8 @@ static int kvm_init(MachineState *ms)
                                                             "kvm-type",
                                                             &error_abort);
         type = mc->kvm_type(ms, kvm_type);
+    } else if (mc->kvm_type) {
+        type = mc->kvm_type(ms, NULL);
     }
 
     do {
-- 
2.20.1