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

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Subject: Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table
From: Vlastimil Babka <vbabka@xxxxxxx>
Date: Mon, 15 Jan 2024 10:14:43 +0100
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>, Michael Roth <michael.roth@xxxxxxx>, x86@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-crypto@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, jroedel@xxxxxxx, thomas.lendacky@xxxxxxx, hpa@xxxxxxxxx, ardb@xxxxxxxxxx, pbonzini@xxxxxxxxxx, seanjc@xxxxxxxxxx, vkuznets@xxxxxxxxxx, jmattson@xxxxxxxxxx, luto@xxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, slp@xxxxxxxxxx, pgonda@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, srinivas.pandruvada@xxxxxxxxxxxxxxx, rientjes@xxxxxxxxxx, tobin@xxxxxxx, kirill@xxxxxxxxxxxxx, ak@xxxxxxxxxxxxxxx, tony.luck@xxxxxxxxx, sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx, alpergun@xxxxxxxxxx, jarkko@xxxxxxxxxx, ashish.kalra@xxxxxxx, nikunj.dadhania@xxxxxxx, pankaj.gupta@xxxxxxx, liam.merwick@xxxxxxxxxx, zhi.a.wang@xxxxxxxxx, Brijesh Singh <brijesh.singh@xxxxxxx>
In-reply-to: <20240115090639.GAZaT1nx4C4xJuF8IA@fat_crate.local>
References: <20231230161954.569267-1-michael.roth@amd.com> <20231230161954.569267-12-michael.roth@amd.com> <cb604c37-aeb5-45bd-b6db-246ae724e4ca@intel.com> <20240112200751.GHZaGcF0-OZVJiIB7y@fat_crate.local> <f0f44280-799a-4bf8-bf88-d423a2bd41ec@suse.cz> <20240115090639.GAZaT1nx4C4xJuF8IA@fat_crate.local>
User-agent: Mozilla Thunderbird

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.
>

References:
- [PATCH v1 00/26] Add AMD Secure Nested Paging (SEV-SNP) Initialization Support
  - From: Michael Roth
- [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table
  - From: Michael Roth
- Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table
  - From: Dave Hansen
- Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table
  - From: Borislav Petkov
- Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table
  - From: Vlastimil Babka
- Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table
  - From: Borislav Petkov

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