On Mon, 10 Dec 2018 at 20:22, Richard Henderson
[off-list ref] wrote:

On 12/10/18 2:12 PM, Kristina Martsenko wrote:

quoted

The plan was to disable trapping, yes. However, after that thread there
was a retrospective change applied to the architecture, such that the
XPACLRI (and XPACD/XPACI) instructions are no longer trapped by
HCR_EL2.API. (The public documentation on this has not been updated
yet.) This means that no HINT-space instructions should trap anymore.

Ah, thanks for the update.  I'll update my QEMU patch set.

Just to follow up on this loose end, this change to HCR_EL2.API
trap behaviour is documented in the 00bet9 release of the system
register XML which came out today:
https://developer.arm.com/products/architecture/cpu-architecture/a-profile/exploration-tools/system-registers-for-armv8-a

thanks
-- PMM

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