A couple of last minute fixes for MTE:

 (1) Peter pointed out that EL3's SCR.ATA needs to be set when
     we're booting a kernel directly.  Similarly for API & APK.

 (2) Vincenzo pointed out that with RRND=1, we can't rely on
     RGSR having being initialized.

     I suppose the only follow-on question here is whether it is
     better to minimize the number of calls to qemu_guest_getrandom,
     or instead to name that our IMPDEF algorithm and use it for
     every call to IRG.  We already have other user-space available
     RNG instructions that can drain the entropy pool, so this is
     not really different.


r~


Richard Henderson (3):
  hw/arm/boot: Fix PAUTH for EL3 direct kernel boot
  hw/arm/boot: Fix MTE for EL3 direct kernel boot
  target/arm: Improve IMPDEF algorithm for IRG

 hw/arm/boot.c           |  6 ++++++
 target/arm/mte_helper.c | 37 ++++++++++++++++++++++++++++++-------
 2 files changed, 36 insertions(+), 7 deletions(-)

-- 
2.25.1

On Fri, 24 Jul 2020 at 17:38, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> A couple of last minute fixes for MTE:
>
>  (1) Peter pointed out that EL3's SCR.ATA needs to be set when
>      we're booting a kernel directly.  Similarly for API & APK.
>
>  (2) Vincenzo pointed out that with RRND=1, we can't rely on
>      RGSR having being initialized.
>
>      I suppose the only follow-on question here is whether it is
>      better to minimize the number of calls to qemu_guest_getrandom,
>      or instead to name that our IMPDEF algorithm and use it for
>      every call to IRG.  We already have other user-space available
>      RNG instructions that can drain the entropy pool, so this is
>      not really different.
>



Applied to target-arm.next, thanks.

-- PMM