Re: [PATCH 30/39] x86/mm/pti: Clone entry-text again in pti_finalize()

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To: Joerg Roedel <joro@xxxxxxxxxx>
Subject: Re: [PATCH 30/39] x86/mm/pti: Clone entry-text again in pti_finalize()
From: Andy Lutomirski <luto@xxxxxxxxxx>
Date: Fri, 13 Jul 2018 16:21:45 -0700
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H . Peter Anvin" <hpa@xxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Jiri Kosina <jkosina@xxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, David Laight <David.Laight@xxxxxxxxxx>, Denys Vlasenko <dvlasenk@xxxxxxxxxx>, Eduardo Valentin <eduval@xxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, "Liguori, Anthony" <aliguori@xxxxxxxxxx>, Daniel Gruss <daniel.gruss@xxxxxxxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Waiman Long <llong@xxxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, "David H . Gutteridge" <dhgutteridge@xxxxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>
In-reply-to: <1531308586-29340-31-git-send-email-joro@8bytes.org>
References: <1531308586-29340-1-git-send-email-joro@8bytes.org> <1531308586-29340-31-git-send-email-joro@8bytes.org>

On Wed, Jul 11, 2018 at 4:29 AM, Joerg Roedel <joro@xxxxxxxxxx> wrote:
> From: Joerg Roedel <jroedel@xxxxxxx>
>
> The mapping for entry-text might have changed in the kernel
> after it was cloned to the user page-table. Clone again
> to update the user page-table to bring the mapping in sync
> with the kernel again.

Can't we just defer pti_init() until after mark_readonly()?  What am I missing?

Follow-Ups:
- Re: [PATCH 30/39] x86/mm/pti: Clone entry-text again in pti_finalize()
  - From: Joerg Roedel

References:
- [PATCH 00/39 v7] PTI support for x86-32
  - From: Joerg Roedel
- [PATCH 30/39] x86/mm/pti: Clone entry-text again in pti_finalize()
  - From: Joerg Roedel

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