linux-kernel - Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table

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Date: Mon, 15 Jan 2024 10:14:43 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Borislav Petkov <bp@...en8.de>, Mike Rapoport <rppt@...nel.org>
Cc: Dave Hansen <dave.hansen@...el.com>, Michael Roth <michael.roth@....com>,
 x86@...nel.org, kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
 linux-mm@...ck.org, linux-crypto@...r.kernel.org,
 linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
 jroedel@...e.de, 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, tobin@....com,
 kirill@...temov.name, ak@...ux.intel.com, tony.luck@...el.com,
 sathyanarayanan.kuppuswamy@...ux.intel.com, alpergun@...gle.com,
 jarkko@...nel.org, ashish.kalra@....com, nikunj.dadhania@....com,
 pankaj.gupta@....com, liam.merwick@...cle.com, zhi.a.wang@...el.com,
 Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map
 when adding them to the RMP table

On 1/15/24 10:06, Borislav Petkov wrote:
> On Fri, Jan 12, 2024 at 09:27:45PM +0100, Vlastimil Babka wrote:
>> Yeah and last LSF/MM we concluded that it's not as a big disadvantage as we
>> previously thought https://lwn.net/Articles/931406/
> 
> How nice, thanks for that!
> 
> Do you have some refs to Mike's tests so that we could run them here too
> with SNP guests to see how big - if any - the fragmentation has.

Let me Cc him...

> Thx.
>