linux-kernel - Re: [PATCH 05/21] x86/mm/pat: mirror direct map changes to ASI

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Message-ID: <20260121120318.GCaXDAhqoU8Q0PLTX8@fat_crate.local>
Date: Wed, 21 Jan 2026 13:03:18 +0100
From: Borislav Petkov <bp@...en8.de>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: Dave Hansen <dave.hansen@...el.com>, Andy Lutomirski <luto@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Yuanchu Xie <yuanchu@...gle.com>,
	Roman Gushchin <roman.gushchin@...ux.dev>, peterz@...radead.org,
	dave.hansen@...ux.intel.com, mingo@...hat.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, david@...hat.com, derkling@...gle.com,
	junaids@...gle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, reijiw@...gle.com, rientjes@...gle.com,
	rppt@...nel.org, vbabka@...e.cz, x86@...nel.org,
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: Re: [PATCH 05/21] x86/mm/pat: mirror direct map changes to ASI

On Wed, Jan 21, 2026 at 11:49:13AM +0000, Brendan Jackman wrote:
> Well, something has to manage those pagetables and that thing needs a
> term to describe the stuff it's acting on. I.e. we need an adjective
> better than "to-be-mapped-into-the-full-pagtable".
> 
> Anyway, I think this will be an easier debate to have once we're looking
> at actual code etc - I'm still debugging my page allocator changes to
> support the guest_memfd thing and that code doesn't need to care about
> "sensitivity" at all, there's just one address space and data is
> "mapped" or "unmapped". So I propose we defer this conversation until
> after that...

Ok, sounds good.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette