linux-kernel - Re: [PATCH 4/5] x86/its: explicitly manage permissions for ITS pages

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Message-ID: <652ce9db-0bca-4892-aa16-1c41ef469f51@suse.com>
Date: Thu, 5 Jun 2025 12:23:30 +0300
From: Nikolay Borisov <nik.borisov@...e.com>
To: Mike Rapoport <rppt@...nel.org>, Peter Zijlstra <peterz@...radead.org>
Cc: Borislav Petkov <bp@...en8.de>, Dave Hansen
 <dave.hansen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>,
 J�rgen Gro� <jgross@...e.com>,
 "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>,
 Xin Li <xin@...or.com>, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 4/5] x86/its: explicitly manage permissions for ITS pages

On 6/3/25 14:14, Mike Rapoport wrote:
> From: "Peter Zijlstra (Intel)" <peterz@...radead.org>
> 
> execmem_alloc() sets permissions differently depending on the kernel
> configuration, CPU support for PSE and whether a page is allocated
> before or after mark_rodata_ro().
> 
> Add tracking for pages allocated for ITS when patching the core kernel
> and make sure the permissions for ITS pages are explicitly managed for
> both kernel and module allocations.
> 
> Fixes: 872df34d7c51 ("x86/its: Use dynamic thunks for indirect branches")
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Co-developed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

Reviewed-by: Nikolay Borisov <nik.borisov@...e.com>