arm64: KVM: Allow unaligned accesses at EL2

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commit 78fd6dcf11 upstream.

We currently have the SCTLR_EL2.A bit set, trapping unaligned accesses
at EL2, but we're not really prepared to deal with it. So far, this
has been unnoticed, until GCC 7 started emitting those (in particular
64bit writes on a 32bit boundary).

Since the rest of the kernel is pretty happy about that, let's follow
its example and set SCTLR_EL2.A to zero. Modern CPUs don't really
care.

Reported-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
[bwh: Backported to 3.16: s/ELx/EL2/]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Marc Zyngier 2017-06-06 19:08:34 +01:00 • committed by Ben Hutchings

parent 79e1a7e336

commit 5e5c8768a5

1 changed files with 3 additions and 2 deletions

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arch/arm64/kvm/hyp-init.S

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