linux-kernel - Re: [PATCH v6 7/7] x86/vmware: Add TDX hypercall support

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Date: Mon, 22 Jan 2024 08:32:22 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Alexey Makhalov <alexey.makhalov@...adcom.com>,
 linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev, bp@...en8.de,
 hpa@...or.com, dave.hansen@...ux.intel.com, mingo@...hat.com,
 tglx@...utronix.de
Cc: x86@...nel.org, netdev@...r.kernel.org, richardcochran@...il.com,
 linux-input@...r.kernel.org, dmitry.torokhov@...il.com, zackr@...are.com,
 linux-graphics-maintainer@...are.com, pv-drivers@...are.com,
 namit@...are.com, timothym@...are.com, akaher@...are.com, jsipek@...are.com,
 dri-devel@...ts.freedesktop.org, daniel@...ll.ch, airlied@...il.com,
 tzimmermann@...e.de, mripard@...nel.org, maarten.lankhorst@...ux.intel.com,
 horms@...nel.org, kirill.shutemov@...ux.intel.com
Subject: Re: [PATCH v6 7/7] x86/vmware: Add TDX hypercall support

On 1/9/24 00:40, Alexey Makhalov wrote:
> +#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 ULONG_MAX;
> +
> +	if (cmd & ~VMWARE_CMD_MASK) {
> +		pr_warn_once("Out of range command %lx\n", cmd);
> +		return ULONG_MAX;
> +	}
> +
> +	args->r10 = VMWARE_TDX_VENDOR_LEAF;
> +	args->r11 = VMWARE_TDX_HCALL_FUNC;
> +	args->r12 = VMWARE_HYPERVISOR_MAGIC;
> +	args->r13 = cmd;
> +	args->r15 = 0; /* CPL */
> +
> +	__tdx_hypercall(args);
> +
> +	return args->r12;
> +}
> +EXPORT_SYMBOL_GPL(vmware_tdx_hypercall);
> +#endif

This is the kind of wrapper that I was hoping for.  Thanks.

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>