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

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Message-ID: <20260121112738.GBaXC4KgFQ2J667ea5@fat_crate.local>
Date: Wed, 21 Jan 2026 12:27:38 +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 09:45:22AM +0000, Brendan Jackman wrote:
> 2. The property of some memory being mapped or unmapped in the
>    "restricted"/"partial"/"sensitive" address space (current patch's
>    terminology: sensitive/nonsensitive).

Why do we care about the sensitivity of memory? To the kernel it doesn't
matter whether memory is sensitive or not. You simply map it in the sensitive
page table or in the nonsensitive or in both.

Having a sensitive and nonsensitive pagetable should be enough. And that'll
make the whole concept a lot simpler.

I'd say.

Thx.

-- 
Regards/Gruss,
    Boris.

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