Re: [PATCH v23 07/28] x86/mm: Remove _PAGE_DIRTY from kernel RO pages

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On 3/22/2021 2:13 AM, Kirill A. Shutemov wrote:
On Tue, Mar 16, 2021 at 08:10:33AM -0700, Yu-cheng Yu wrote:
The x86 family of processors do not directly create read-only and Dirty
PTEs.  These PTEs are created by software.  One such case is that kernel
read-only pages are historically setup as Dirty.

New processors that support Shadow Stack regard read-only and Dirty PTEs as
shadow stack pages.  This results in ambiguity between shadow stack and
kernel read-only pages.  To resolve this, removed Dirty from kernel read-
only pages.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>

Looks good to me.

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>


Thanks for reviewing.

Yu-cheng



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