linux-kernel - RE: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers

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Date:   Wed, 22 Jun 2022 18:34:34 +0000
From:   "Kalra, Ashish" <Ashish.Kalra@....com>
To:     Dave Hansen <dave.hansen@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
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Subject: RE: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers

[AMD Official Use Only - General]

-----Original Message-----
From: Dave Hansen <dave.hansen@...el.com> 
Sent: Wednesday, June 22, 2022 1:18 PM
To: Kalra, Ashish <Ashish.Kalra@....com>; x86@...nel.org; linux-kernel@...r.kernel.org; kvm@...r.kernel.org; linux-coco@...ts.linux.dev; linux-mm@...ck.org; linux-crypto@...r.kernel.org
Cc: tglx@...utronix.de; mingo@...hat.com; jroedel@...e.de; Lendacky, Thomas <Thomas.Lendacky@....com>; hpa@...or.com; ardb@...nel.org; pbonzini@...hat.com; seanjc@...gle.com; vkuznets@...hat.com; jmattson@...gle.com; luto@...nel.org; dave.hansen@...ux.intel.com; slp@...hat.com; pgonda@...gle.com; peterz@...radead.org; srinivas.pandruvada@...ux.intel.com; rientjes@...gle.com; dovmurik@...ux.ibm.com; tobin@....com; bp@...en8.de; Roth, Michael <Michael.Roth@....com>; vbabka@...e.cz; kirill@...temov.name; ak@...ux.intel.com; tony.luck@...el.com; marcorr@...gle.com; sathyanarayanan.kuppuswamy@...ux.intel.com; alpergun@...gle.com; dgilbert@...hat.com; jarkko@...nel.org
Subject: Re: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers

On 6/22/22 11:15, Kalra, Ashish wrote:
> So actually this RPM entry definition is platform dependent and will 
> need to be changed for different AMD processors and that change has to 
> be handled correspondingly in the dump_rmpentry() code.

>So, if the RMP entry format changes in future processors, how do we make sure that the kernel does not try to use *this* code on those processors?

Functions snp_lookup_rmpentry() and dump_rmpentry() which rely on this structure definition will need to handle it accordingly.

Thanks,
Ashish