linux-kernel - Re: [PATCH 4.9 v2] x86/pti/efi: broken conversion from efi to kernel page table

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Message-ID: <20180115174954.GA4943@kroah.com>
Date:   Mon, 15 Jan 2018 18:49:54 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
Cc:     steven.sistare@...cle.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, jkosina@...e.cz, hughd@...gle.com,
        dave.hansen@...ux.intel.com, luto@...nel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 4.9 v2] x86/pti/efi: broken conversion from efi to kernel
 page table

On Mon, Jan 15, 2018 at 11:44:14AM -0500, Pavel Tatashin 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>
> Acked-by: Jiri Kosina <jkosina@...e.cz>
> ---
>  arch/x86/include/asm/pgalloc.h | 11 +++++++++++
>  arch/x86/mm/pgtable.c          |  7 -------
>  arch/x86/platform/efi/efi_64.c |  2 +-
>  3 files changed, 12 insertions(+), 8 deletions(-)
> 
> Changelog:
> 	v1 - v2: Fixed compiling warning

Many thanks for this, now queued up.

greg k-h