Re: [PATCH 1/2] kasan: arm64: set TCR_EL1.TBID1 when enabled

On Sat, 21 Nov 2020 01:59:02 -0800, Peter Collingbourne wrote:

On hardware supporting pointer authentication, we previously ended up
enabling TBI on instruction accesses when tag-based ASAN was enabled,
but this was costing us 8 bits of PAC entropy, which was unnecessary
since tag-based ASAN does not require TBI on instruction accesses. Get
them back by setting TCR_EL1.TBID1.

Applied to arm64 (for-next/misc), thanks!

[1/2] kasan: arm64: set TCR_EL1.TBID1 when enabled
      https://git.kernel.org/arm64/c/49b3cf035edc

This patch looks safe. Patch 2/2 needs more discussions.

-- 
Catalin