linux-kernel - Re: [PATCH v2 00/18] arm64: Unmap the kernel whilst running in userspace (KAISER)

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Message-ID: <20171201175026.GB8826@arm.com>
Date:   Fri, 1 Dec 2017 17:50:26 +0000
From:   Will Deacon <will.deacon@....com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, ard.biesheuvel@...aro.org,
        sboyd@...eaurora.org, dave.hansen@...ux.intel.com,
        keescook@...omium.org, msalter@...hat.com, labbott@...hat.com,
        tglx@...utronix.de
Subject: Re: [PATCH v2 00/18] arm64: Unmap the kernel whilst running in
 userspace (KAISER)

Hi Mark,

On Fri, Dec 01, 2017 at 02:04:06PM +0000, Mark Rutland wrote:
> On Thu, Nov 30, 2017 at 04:39:28PM +0000, Will Deacon wrote:
> > Hi again,
> > 
> > This is version two of the patches previously posted here:
> > 
> >   http://lists.infradead.org/pipermail/linux-arm-kernel/2017-November/542751.html
> > 
> > Changes since v1 include:
> > 
> >   * Based on v4.15-rc1
> >   * Trampoline moved into FIXMAP area
> >   * Explicit static key replaced by cpu cap
> >   * Disable SPE for userspace profiling if kernel unmapped at EL0
> >   * Changed polarity of cpu feature to match config option
> >   * Changed command-line option so we can force on in future if necessary
> >   * Changed Falkor workaround to invalidate different page within 2MB region
> >   * Reworked alternative sequences in entry.S, since the NOP slides with
> >     kaiser=off were measurable
> 
> This generally looks good to me.
> 
> For patches patches 1-10, 13-15, and 17, feel free to add:
> 
> Reviewed-by: Mark Rutland <mark.rutland@....com>

Thanks for going through this. Do you have any ideas about what we could
rename the command-line option to? I'll get us started:

  - kaiser=
  - hidekernel=
  - unmapkernel=
  - hardenkaslr=
  - swuan=

...

Will