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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Message-ID: <ZaT3424NIr-BrMr_@kernel.org>
Date: Mon, 15 Jan 2024 11:16:19 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Vlastimil Babka <vbabka@...e.cz>, 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 Mon, Jan 15, 2024 at 10:06:39AM +0100, 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.

I ran several tests from mmtests suite.

The tests results are here:
https://rppt.io/gfp-unmapped-bench/
 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette
> 

-- 
Sincerely yours,
Mike.