Re: [PATCH] x86/mm: disable instrumentations of mm/pgprot.c

[Niklas Cassel]

On Wed, Aug 24, 2022 at 05:47:26PM +0900, Naohiro Aota wrote:
> The commit 4867fbbdd6b3 ("x86/mm: move protection_map[] inside the
> platform") moved accesses to protection_map[] from mem_encrypt_amd.c to
> pgprot.c. As a result, the accesses are now targets of KASAN (and other
> instrumentations), leading to the crash during the boot process.
> 
> Disable the instrumentations for pgprot.c like commit 67bb8e999e0a
> ("x86/mm: Disable various instrumentations of mm/mem_encrypt.c and
> mm/tlb.c").
> 
> Before this patch, my AMD machine cannot boot since v6.0-rc1 with KASAN
> enabled, without anything printed. After the change, it successfully boots
> up.
> 
> Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
> Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
> ---

Hello Andrew,

I see that this patch is in linux-next, but not in Linus's tree.

Since this fixes something introduced in v6.0-rc1, I think this
ought to go into v6.0 before it is released.


Kind regards,
Niklas