linux-kernel - Re: [PATCH 4.9] x86/pti/efi: broken conversion from efi to kernel page table

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Message-ID: <CAOAebxsNF4Xu7PqcLf4t7d6Nw0s=XbWXH+evtnDu0tkvzVbeGg@mail.gmail.com>
Date:   Fri, 12 Jan 2018 09:09:37 -0500
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Steve Sistare <steven.sistare@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Kosina <jkosina@...e.cz>, Hugh Dickins <hughd@...gle.com>,
        dave.hansen@...ux.intel.com, Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4.9] x86/pti/efi: broken conversion from efi to kernel
 page table

Hi Ingo,

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/log/?h=linux-4.9.y&ofs=50
4.9 PTI backport is in 4.9.75.

Thank you,
Pavel

On Fri, Jan 12, 2018 at 8:58 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Pavel Tatashin <pasha.tatashin@...cle.com> wrote:
>
>> The page table order must be increased for EFI table in order to avoid a
>> bug where NMI tries to change the page table to kernel page table, while
>> efi page table is active.
>>
>> For more disccussion about this bug, see this thread:
>> http://lkml.iu.edu/hypermail/linux/kernel/1801.1/00951.html
>>
>> Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
>> Reviewed-by: Steven Sistare <steven.sistare@...cle.com>
>> ---
>>  arch/x86/include/asm/pgalloc.h | 11 +++++++++++
>>  arch/x86/platform/efi/efi_64.c |  2 +-
>>  2 files changed, 12 insertions(+), 1 deletion(-)
>
> Is there a Git tree/branch I could follow to see the very latest v4.9 PTI backport
> commits?
>
> Thanks,
>
>         Ingo