Re: [PATCH v3 6/6] x86/vmware: Add TDX hypercall support

[kirill . shutemov]

On Tue, Dec 19, 2023 at 01:57:51PM -0800, Alexey Makhalov wrote:
> diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
> index 3aa1adaed18f..ef07ab7a07e1 100644
> --- a/arch/x86/kernel/cpu/vmware.c
> +++ b/arch/x86/kernel/cpu/vmware.c
> @@ -428,6 +428,30 @@ static bool __init vmware_legacy_x2apic_available(void)
>  		(eax & BIT(VCPU_LEGACY_X2APIC));
>  }
>  
> +#ifdef CONFIG_INTEL_TDX_GUEST
> +unsigned long vmware_tdx_hypercall(unsigned long cmd,
> +				   struct tdx_module_args *args)
> +{
> +	if (!hypervisor_is_type(X86_HYPER_VMWARE))
> +		return 0;
> +
> +	if (cmd & ~VMWARE_CMD_MASK) {
> +		pr_warn("Out of range command %x\n", cmd);
> +		return 0;

Is zero success? Shouldn't it be an error?

> +	}
> +
> +	args->r10 = VMWARE_TDX_VENDOR_LEAF;
> +	args->r11 = VMWARE_TDX_HCALL_FUNC;
> +	args->r12 = VMWARE_HYPERVISOR_MAGIC;
> +	args->r13 = cmd;
> +
> +	__tdx_hypercall(args);
> +
> +	return args->r12;
> +}
> +EXPORT_SYMBOL_GPL(vmware_tdx_hypercall);
> +#endif
> +
>  #ifdef CONFIG_AMD_MEM_ENCRYPT
>  static void vmware_sev_es_hcall_prepare(struct ghcb *ghcb,
>  					struct pt_regs *regs)
> -- 
> 2.39.0
> 

-- 
  Kiryl Shutsemau / Kirill A. Shutemov