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Message-ID: <53592a3a-3d96-4aa1-8357-ec595f59c5f3@intel.com>
Date: Thu, 7 Dec 2023 09:12:41 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Alexey Makhalov <alexey.makhalov@...adcom.com>,
linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev, hpa@...or.com,
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linux-input@...r.kernel.org, dmitry.torokhov@...il.com, zackr@...are.com,
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Subject: Re: [PATCH] x86/vmware: Add TDX hypercall support
On 12/5/23 23:15, Alexey Makhalov wrote:
> +#ifdef CONFIG_INTEL_TDX_GUEST
> +/* Export tdx hypercall and allow it only for VMware guests. */
> +void vmware_tdx_hypercall_args(struct tdx_module_args *args)
> +{
> + if (hypervisor_is_type(X86_HYPER_VMWARE))
> + __tdx_hypercall(args);
> +}
> +EXPORT_SYMBOL_GPL(vmware_tdx_hypercall_args);
> +#endif
I think this is still too generic. This still allows anything setting
X86_HYPER_VMWARE to make any TDX hypercall.
I'd *much* rather you export something like vmware_tdx_hypercall() or
even the high-level calls like hypervisor_ppn_reset_all(). The higher
level and more specialized the interface, the less likely it is to be
abused.
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