linux-kernel - Re: [PATCH] mm/x86/pat: Only untrack the pfn range if unmap region

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Message-ID: <Zpfxm_Nj9ULA0Tx6@x1n>
Date: Wed, 17 Jul 2024 12:30:19 -0400
From: Peter Xu <peterx@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: Yan Zhao <yan.y.zhao@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Jason Gunthorpe <jgg@...dia.com>, Al Viro <viro@...iv.linux.org.uk>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	"x86@...nel.org" <x86@...nel.org>,
	"Tian, Kevin" <kevin.tian@...el.com>, Pei Li <peili.dev@...il.com>,
	David Wang <00107082@....com>, Bert Karwatzki <spasswolf@....de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH] mm/x86/pat: Only untrack the pfn range if unmap region

On Wed, Jul 17, 2024 at 04:17:12PM +0200, David Hildenbrand wrote:
> I'd be curious how a previous truncation on a file can tear down a PFNMAP
> mapping -- and if there are simple ways to forbid that (if possible).

Unfortunately, forbiding it may not work for vfio, as vfio would like to
allow none (or partial) mapping on the bars.. at least so far that's the
plan.

-- 
Peter Xu