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:

quoted

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 <redacted>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Kees Cook <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>

Looks good to me.

Reviewed-by: Kirill A. Shutemov <redacted>

Thanks for reviewing.

Yu-cheng