Re: [PATCH v6 07/60] kvm: Introduce kvm_arch_pre_create_vcpu()

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

Hi,

On 5/11/24 06:23, Xiaoyao Li wrote:
> Introduce kvm_arch_pre_create_vcpu(), to perform arch-dependent
> work prior to create any vcpu. This is for i386 TDX because it needs
> call TDX_INIT_VM before creating any vcpu.
>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
> Acked-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> Changes in v3:
> - pass @errp to kvm_arch_pre_create_vcpu(); (Per Daniel)
> ---
>   accel/kvm/kvm-all.c  | 10 ++++++++++
>   include/sysemu/kvm.h |  1 +
>   2 files changed, 11 insertions(+)
>
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 930a5bfed58f..1732fa1adecd 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -523,6 +523,11 @@ void kvm_destroy_vcpu(CPUState *cpu)
>       }
>   }
>   
> +int __attribute__ ((weak)) kvm_arch_pre_create_vcpu(CPUState *cpu, Error **errp)

We don't use the weak attribute. Maybe declare stubs for each arch?

> +{
> +    return 0;
> +}
> +
>   int kvm_init_vcpu(CPUState *cpu, Error **errp)
>   {
>       KVMState *s = kvm_state;
> @@ -531,6 +536,11 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp)
>   
>       trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
>   
> +    ret = kvm_arch_pre_create_vcpu(cpu, errp);
> +    if (ret < 0) {
> +        goto err;
> +    }
> +
>       ret = kvm_create_vcpu(cpu);
>       if (ret < 0) {
>           error_setg_errno(errp, -ret,
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index c3a60b28909a..643ca4950543 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -374,6 +374,7 @@ int kvm_arch_get_default_type(MachineState *ms);
>   
>   int kvm_arch_init(MachineState *ms, KVMState *s);
>   
> +int kvm_arch_pre_create_vcpu(CPUState *cpu, Error **errp);
>   int kvm_arch_init_vcpu(CPUState *cpu);
>   int kvm_arch_destroy_vcpu(CPUState *cpu);
>