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Subject: RE: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers
Thread-Topic: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers
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Date:   Mon, 1 Aug 2022 21:53:59 +0000
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[AMD Official Use Only - General]

As I mentioned before, in the future we will have architectural support to =
read RMP table entries, we will first check for
availability of this feature and use it always if it is supported and enabl=
ed, and only fallback to doing raw RMP table access
if this architectural support is not available.

Thanks,
Ashish

-----Original Message-----
From: Borislav Petkov <bp@alien8.de>=20
Sent: Friday, July 22, 2022 2:38 PM
To: Sean Christopherson <seanjc@google.com>
Cc: Kalra, Ashish <Ashish.Kalra@amd.com>; Dave Hansen <dave.hansen@intel.co=
m>; x86@kernel.org; linux-kernel@vger.kernel.org; kvm@vger.kernel.org; linu=
x-coco@lists.linux.dev; linux-mm@kvack.org; linux-crypto@vger.kernel.org; t=
glx@linutronix.de; mingo@redhat.com; jroedel@suse.de; Lendacky, Thomas <Tho=
mas.Lendacky@amd.com>; hpa@zytor.com; ardb@kernel.org; pbonzini@redhat.com;=
 vkuznets@redhat.com; jmattson@google.com; luto@kernel.org; dave.hansen@lin=
ux.intel.com; slp@redhat.com; pgonda@google.com; peterz@infradead.org; srin=
ivas.pandruvada@linux.intel.com; rientjes@google.com; dovmurik@linux.ibm.co=
m; tobin@ibm.com; Roth, Michael <Michael.Roth@amd.com>; vbabka@suse.cz; kir=
ill@shutemov.name; ak@linux.intel.com; tony.luck@intel.com; marcorr@google.=
com; sathyanarayanan.kuppuswamy@linux.intel.com; alpergun@google.com; dgilb=
ert@redhat.com; jarkko@kernel.org
Subject: Re: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers

Btw,

what could work is to spec only a *version* field somewhere in the HW or FW=
 which says which version the RMP header has.

Then, OS would check that field and if it doesn't support that certain vers=
ion, it'll bail.

I'd need to talk to folks first, though, what the whole story is behind not=
 spec-ing the RMP format...

--
Regards/Gruss,
    Boris.

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