[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:

quoted

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@arm.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