linux-kernel - Re: [PATCH v4 3/8] x86/virt/tdx: Prepare to support reading other global metadata fields

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Message-ID: <a03f740b-6b0c-4a64-9ff1-7eba3ac7a583@intel.com>
Date: Thu, 26 Sep 2024 15:26:29 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "Huang, Kai" <kai.huang@...el.com>,
 "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
 "tglx@...utronix.de" <tglx@...utronix.de>, "bp@...en8.de" <bp@...en8.de>,
 "peterz@...radead.org" <peterz@...radead.org>,
 "mingo@...hat.com" <mingo@...hat.com>, "hpa@...or.com" <hpa@...or.com>,
 "Williams, Dan J" <dan.j.williams@...el.com>,
 "seanjc@...gle.com" <seanjc@...gle.com>,
 "pbonzini@...hat.com" <pbonzini@...hat.com>
Cc: "x86@...nel.org" <x86@...nel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
 "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
 "Yamahata, Isaku" <isaku.yamahata@...el.com>,
 "Hunter, Adrian" <adrian.hunter@...el.com>,
 "nik.borisov@...e.com" <nik.borisov@...e.com>
Subject: Re: [PATCH v4 3/8] x86/virt/tdx: Prepare to support reading other
 global metadata fields

On 9/26/24 15:22, Huang, Kai wrote:
> But Dan commented using typeless 'void *' and 'size' is kinda a step
> backwards and we should do something similar to build_mmio_read():

Well, void* is typeless, but at least it knows the size in this case.
It's not completely aimless.  I was thinking of how things like
get_user() work.