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Date: Tue, 5 Dec 2017 20:17:50 +0100
From: Borislav Petkov <bp@suse.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Lutomirsky <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Greg KH <gregkh@linuxfoundation.org>, keescook@google.com,
        hughd@google.com, Brian Gerst <brgerst@gmail.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Denys Vlasenko <dvlasenk@redhat.com>, Rik van Riel <riel@redhat.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        David Laight <David.Laight@aculab.com>,
        Eduardo Valentin <eduval@amazon.com>, aliguori@amazon.com,
        Will Deacon <will.deacon@arm.com>, daniel.gruss@iaik.tugraz.at,
        Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [patch 34/60] x86/mm/kpti: Populate user PGD
Message-ID: <20171205191750.46frimb4c274mphz@pd.tnic>
References: <20171204140706.296109558@linutronix.de>
 <20171204150607.644572098@linutronix.de>
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On Mon, Dec 04, 2017 at 03:07:40PM +0100, Thomas Gleixner wrote:
> From: Dave Hansen <dave.hansen@linux.intel.com>
> 
> Populate the PGD entries in the init user PGD which cover the kernel half
> of the address space. This makes sure that the installment of the user
> visible kernel mappings finds a populated PGD.
> 
> In clone_pgd_range() copy the init user PGDs which cover the kernel half of
> the address space, so a process has all the required kernel mappings
> visible.
> 
> [ tglx: Split out from the big kaiser dump ]
> 
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> 
> ---
>  arch/x86/include/asm/pgtable.h |    5 +++++
>  arch/x86/mm/kpti.c             |   41 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 46 insertions(+)

Reviewed-by: Borislav Petkov <bp@suse.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--