tree 26da96016b68da0a7132b158e832eea77ab8ac2a
parent e8679fedd026eb3b4655af83829d9036e32c9b97
author Marc Zyngier <maz@kernel.org> 1591688435 +0100
committer Marc Zyngier <maz@kernel.org> 1591801437 +0100

KVM: arm64: Make vcpu_cp1x() work on Big Endian hosts

AArch32 CP1x registers are overlayed on their AArch64 counterparts
in the vcpu struct. This leads to an interesting problem as they
are stored in their CPU-local format, and thus a CP1x register
doesn't "hit" the lower 32bit portion of the AArch64 register on
a BE host.

To workaround this unfortunate situation, introduce a bias trick
in the vcpu_cp1x() accessors which picks the correct half of the
64bit register.

Cc: stable@vger.kernel.org
Reported-by: James Morse <james.morse@arm.com>
Tested-by: James Morse <james.morse@arm.com>
Acked-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>