[PATCH v7 2/4] arm: enhance kvm_arm_create_scratch_host_vcpu

[Peter Xu <peterx@xxxxxxxxxx>]

Some more lines to make sure we allow NULL for 1st/3rd parameter.

Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
 target-arm/kvm.c     | 14 +++++++++++++-
 target-arm/kvm_arm.h |  6 ++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/target-arm/kvm.c b/target-arm/kvm.c
index 969ab0b..bb6935e 100644
--- a/target-arm/kvm.c
+++ b/target-arm/kvm.c
@@ -62,13 +62,17 @@ bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
         goto err;
     }
 
+    if (!init) {
+        goto finish;
+    }
+
     ret = ioctl(vmfd, KVM_ARM_PREFERRED_TARGET, init);
     if (ret >= 0) {
         ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init);
         if (ret < 0) {
             goto err;
         }
-    } else {
+    } else if (cpus_to_try) {
         /* Old kernel which doesn't know about the
          * PREFERRED_TARGET ioctl: we know it will only support
          * creating one kind of guest CPU which is its preferred
@@ -85,8 +89,16 @@ bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
         if (ret < 0) {
             goto err;
         }
+    } else {
+        /*
+         * Here, we got init != NULL but cpus_to_retry == NULL,
+         * meanwhile, we failed to probe one preferred target type
+         * (no matter what). So we fail.
+         */
+        goto err;
     }
 
+finish:
     fdarray[0] = kvmfd;
     fdarray[1] = vmfd;
     fdarray[2] = cpufd;
diff --git a/target-arm/kvm_arm.h b/target-arm/kvm_arm.h
index 07f0c72..4f01a99 100644
--- a/target-arm/kvm_arm.h
+++ b/target-arm/kvm_arm.h
@@ -124,9 +124,11 @@ void kvm_arm_reset_vcpu(ARMCPU *cpu);
  * kvm_arm_create_scratch_host_vcpu:
  * @cpus_to_try: array of QEMU_KVM_ARM_TARGET_* values (terminated with
  * QEMU_KVM_ARM_TARGET_NONE) to try as fallback if the kernel does not
- * know the PREFERRED_TARGET ioctl
+ * know the PREFERRED_TARGET ioctl. If NULL is provided, will try
+ * to use perferred target, and fail if no preferred found.
  * @fdarray: filled in with kvmfd, vmfd, cpufd file descriptors in that order
- * @init: filled in with the necessary values for creating a host vcpu
+ * @init: filled in with the necessary values for creating a host
+ * vcpu. If NULL is provided, will not init the vCPU.
  *
  * Create a scratch vcpu in its own VM of the type preferred by the host
  * kernel (as would be used for '-cpu host'), for purposes of probing it
-- 
2.4.3

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