Re: [PATCH v3 14/70] target/i386: Implement mc->kvm_type() to get VM type

[Daniel P . Berrangé]

On Wed, Nov 15, 2023 at 02:14:23AM -0500, Xiaoyao Li wrote:
> Implement mc->kvm_type() for i386 machines. It provides a way for user
> to create SW_PROTECTE_VM.

Small typo there missing final 'D' in 'PROTECTED'

> 
> Also store the vm_type in machinestate to other code to query what the
> VM type is.
> 
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---
>  hw/i386/x86.c              | 12 ++++++++++++
>  include/hw/i386/x86.h      |  1 +
>  target/i386/kvm/kvm.c      | 25 +++++++++++++++++++++++++
>  target/i386/kvm/kvm_i386.h |  1 +
>  4 files changed, 39 insertions(+)
> 
> diff --git a/hw/i386/x86.c b/hw/i386/x86.c
> index b3d054889bba..55678279bf3b 100644
> --- a/hw/i386/x86.c
> +++ b/hw/i386/x86.c
> @@ -1377,6 +1377,17 @@ static void machine_set_sgx_epc(Object *obj, Visitor 
> *v, const char *name,
>      qapi_free_SgxEPCList(list);
>  }
>  
> +static int x86_kvm_type(MachineState *ms, const char *vm_type)
> +{
> +    X86MachineState *x86ms = X86_MACHINE(ms);
> +    int kvm_type;
> +
> +    kvm_type = kvm_get_vm_type(ms, vm_type);
> +    x86ms->vm_type = kvm_type;
> +
> +    return kvm_type;
> +}
> +
>  static void x86_machine_initfn(Object *obj)
>  {
>      X86MachineState *x86ms = X86_MACHINE(obj);
> @@ -1401,6 +1412,7 @@ static void x86_machine_class_init(ObjectClass *oc, 
> void *data)
>      mc->cpu_index_to_instance_props = x86_cpu_index_to_props;
>      mc->get_default_cpu_node_id = x86_get_default_cpu_node_id;
>      mc->possible_cpu_arch_ids = x86_possible_cpu_arch_ids;
> +    mc->kvm_type = x86_kvm_type;
>      x86mc->save_tsc_khz = true;
>      x86mc->fwcfg_dma_enabled = true;
>      nc->nmi_monitor_handler = x86_nmi;
> diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
> index da19ae15463a..ab1d38569019 100644
> --- a/include/hw/i386/x86.h
> +++ b/include/hw/i386/x86.h
> @@ -41,6 +41,7 @@ struct X86MachineState {
>      MachineState parent;
>  
>      /*< public >*/
> +    unsigned int vm_type;
>  
>      /* Pointers to devices and objects: */
>      ISADevice *rtc;
> diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
> index b4b9ce89842f..2e47fda25f95 100644
> --- a/target/i386/kvm/kvm.c
> +++ b/target/i386/kvm/kvm.c
> @@ -161,6 +161,31 @@ static KVMMSRHandlers 
> msr_handlers[KVM_MSR_FILTER_MAX_RANGES];
>  static RateLimit bus_lock_ratelimit_ctrl;
>  static int kvm_get_one_msr(X86CPU *cpu, int index, uint64_t *value);
>  
> +static const char* vm_type_name[] = {

nitpick   'char *vm_type_name[]', is normal style

> +    [KVM_X86_DEFAULT_VM] = "default",
> +    [KVM_X86_SW_PROTECTED_VM] = "sw-protected-vm",
> +};
> +
> +int kvm_get_vm_type(MachineState *ms, const char *vm_type)
> +{
> +    int kvm_type = KVM_X86_DEFAULT_VM;
> +
> +    /*
> +     * old KVM doesn't support KVM_CAP_VM_TYPES and KVM_X86_DEFAULT_VM
> +     * is always supported
> +     */
> +    if (kvm_type == KVM_X86_DEFAULT_VM) {
> +        return kvm_type;
> +    }
> +
> +    if (!(kvm_check_extension(KVM_STATE(ms->accelerator), KVM_CAP_VM_TYPES) 
> & BIT(kvm_type))) {
> +        error_report("vm-type %s not supported by KVM", 
> vm_type_name[kvm_type]);
> +        exit(1);
> +    }
> +
> +    return kvm_type;
> +}
> +
>  bool kvm_has_smm(void)
>  {
>      return kvm_vm_check_extension(kvm_state, KVM_CAP_X86_SMM);
> diff --git a/target/i386/kvm/kvm_i386.h b/target/i386/kvm/kvm_i386.h
> index 30fedcffea3e..55fb25fa8e2e 100644
> --- a/target/i386/kvm/kvm_i386.h
> +++ b/target/i386/kvm/kvm_i386.h
> @@ -37,6 +37,7 @@ bool kvm_hv_vpindex_settable(void);
>  bool kvm_enable_sgx_provisioning(KVMState *s);
>  bool kvm_hyperv_expand_features(X86CPU *cpu, Error **errp);
>  
> +int kvm_get_vm_type(MachineState *ms, const char *vm_type);
>  void kvm_arch_reset_vcpu(X86CPU *cs);
>  void kvm_arch_after_reset_vcpu(X86CPU *cpu);
>  void kvm_arch_do_init_vcpu(X86CPU *cs);
> -- 
> 2.34.1
> 

With regards,
Daniel
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