Re: [PATCH v3 2/2] kvm: refactor core virtual machine creation into its own function

[Claudio Fontana]

gltm, thanks!

Reviewed-by: Claudio Fontana <cfontana@suse.de>

On 8/9/24 07:10, Ani Sinha wrote:
> Refactoring the core logic around KVM_CREATE_VM into its own separate function
> so that it can be called from other functions in subsequent patches. There is
> no functional change in this patch.
> 
> CC: pbonzini@redhat.com
> CC: zhao1.liu@intel.com
> CC: cfontana@suse.de
> CC: qemu-trivial@nongnu.org
> Signed-off-by: Ani Sinha <anisinha@redhat.com>
> ---
>  accel/kvm/kvm-all.c | 86 ++++++++++++++++++++++++++++-----------------
>  1 file changed, 53 insertions(+), 33 deletions(-)
> 
> changelog:
> v2: s/fprintf/warn_report as suggested by zhao
> v3: s/warn_report/error_report. function names adjusted to conform to
> other names. fprintf -> error_report() moved to its own patch.
> 
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index ac168b9663..610b3ead32 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -2385,6 +2385,57 @@ uint32_t kvm_dirty_ring_size(void)
>      return kvm_state->kvm_dirty_ring_size;
>  }
>  
> +static int kvm_create_vm(MachineState *ms, KVMState *s, int type)
> +{
> +    int ret;
> +
> +    do {
> +        ret = kvm_ioctl(s, KVM_CREATE_VM, type);
> +    } while (ret == -EINTR);
> +
> +    if (ret < 0) {
> +        error_report("ioctl(KVM_CREATE_VM) failed: %d %s", -ret,
> +                    strerror(-ret));
> +
> +#ifdef TARGET_S390X
> +        if (ret == -EINVAL) {
> +            error_report("Host kernel setup problem detected. Please 
> verify:");
> +            error_report("- for kernels supporting the switch_amode or"
> +                        " user_mode parameters, whether");
> +            error_report("  user space is running in primary address space");
> +            error_report("- for kernels supporting the vm.allocate_pgste "
> +                        "sysctl, whether it is enabled");
> +        }
> +#elif defined(TARGET_PPC)
> +        if (ret == -EINVAL) {
> +            error_report("PPC KVM module is not loaded. Try modprobe 
> kvm_%s.",
> +                        (type == 2) ? "pr" : "hv");
> +        }
> +#endif
> +    }
> +
> +    return ret;
> +}
> +
> +static int kvm_machine_type(MachineState *ms)
> +{
> +    MachineClass *mc = MACHINE_GET_CLASS(ms);
> +    int type;
> +
> +    if (object_property_find(OBJECT(current_machine), "kvm-type")) {
> +        g_autofree char *kvm_type;
> +        kvm_type = object_property_get_str(OBJECT(current_machine),
> +                                           "kvm-type",
> +                                           &error_abort);
> +        type = mc->kvm_type(ms, kvm_type);
> +    } else if (mc->kvm_type) {
> +        type = mc->kvm_type(ms, NULL);
> +    } else {
> +        type = kvm_arch_get_default_type(ms);
> +    }
> +    return type;
> +}
> +
>  static int kvm_init(MachineState *ms)
>  {
>      MachineClass *mc = MACHINE_GET_CLASS(ms);
> @@ -2467,45 +2518,14 @@ static int kvm_init(MachineState *ms)
>      }
>      s->as = g_new0(struct KVMAs, s->nr_as);
>  
> -    if (object_property_find(OBJECT(current_machine), "kvm-type")) {
> -        g_autofree char *kvm_type = 
> object_property_get_str(OBJECT(current_machine),
> -                                                            "kvm-type",
> -                                                            &error_abort);
> -        type = mc->kvm_type(ms, kvm_type);
> -    } else if (mc->kvm_type) {
> -        type = mc->kvm_type(ms, NULL);
> -    } else {
> -        type = kvm_arch_get_default_type(ms);
> -    }
> -
> +    type = kvm_machine_type(ms);
>      if (type < 0) {
>          ret = -EINVAL;
>          goto err;
>      }
>  
> -    do {
> -        ret = kvm_ioctl(s, KVM_CREATE_VM, type);
> -    } while (ret == -EINTR);
> -
> +    ret = kvm_create_vm(ms, s, type);
>      if (ret < 0) {
> -        error_report("ioctl(KVM_CREATE_VM) failed: %d %s", -ret,
> -                    strerror(-ret));
> -
> -#ifdef TARGET_S390X
> -        if (ret == -EINVAL) {
> -            error_report("Host kernel setup problem detected. Please 
> verify:");
> -            error_report("- for kernels supporting the switch_amode or"
> -                        " user_mode parameters, whether");
> -            error_report("  user space is running in primary address space");
> -            error_report("- for kernels supporting the vm.allocate_pgste "
> -                        "sysctl, whether it is enabled");
> -        }
> -#elif defined(TARGET_PPC)
> -        if (ret == -EINVAL) {
> -            error_report("PPC KVM module is not loaded. Try modprobe 
> kvm_%s.",
> -                        (type == 2) ? "pr" : "hv");
> -        }
> -#endif
>          goto err;
>      }
>