Re: [PATCH v3 03/12] kvm: Provide explicit error for kvm_create_guest_memfd()

[Xiaoyao Li <xiaoyao.li@intel.com>]

On 12/16/2025 4:51 AM, Peter Xu wrote:
> So that there will be a verbal string returned when kvm not enabled, or kvm
> not compiled.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>

> ---
>   accel/kvm/kvm-all.c    | 5 +++++
>   accel/stubs/kvm-stub.c | 1 +
>   2 files changed, 6 insertions(+)
> 
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 68d57c1af0..c32fbcf9cc 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -4492,6 +4492,11 @@ int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp)
>           .flags = flags,
>       };
>   
> +    if (!kvm_enabled()) {
> +        error_setg(errp, "guest-memfd requires KVM accelerator");
> +        return -1;
> +    }
> +
>       if (!kvm_guest_memfd_supported) {
>           error_setg(errp, "KVM does not support guest_memfd");
>           return -1;
> diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c
> index 73f04eb589..01b1d6285e 100644
> --- a/accel/stubs/kvm-stub.c
> +++ b/accel/stubs/kvm-stub.c
> @@ -123,6 +123,7 @@ bool kvm_hwpoisoned_mem(void)
>   
>   int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp)
>   {
> +    error_setg(errp, "KVM is not enabled");
>       return -ENOSYS;
>   }
>