arm64: KVM: Preserve RES1 bits in SCTLR_EL2

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commit d68c1f7fd1 upstream.

__do_hyp_init has the rather bad habit of ignoring RES1 bits and
writing them back as zero. On a v8.0-8.2 CPU, this doesn't do anything
bad, but may end-up being pretty nasty on future revisions of the
architecture.

Let's preserve those bits so that we don't have to fix this later on.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Marc Zyngier 2017-06-06 19:08:33 +01:00 • committed by Greg Kroah-Hartman

parent 19c9a11508

commit b9824dd75f

2 changed files with 10 additions and 4 deletions

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4

arch/arm64/include/asm/sysreg.h

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10

arch/arm64/kvm/hyp-init.S

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