arm64: KVM: Do not corrupt registers on failed 64bit CP read

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If we fail to emulate a mrrc instruction, we:
1) deliver an exception,
2) spit a nastygram on the console,
3) write back some garbage to Rt/Rt2

While 1) and 2) are perfectly acceptable, 3) is out of the scope of
the architecture... Let's mimick the code in kvm_handle_cp_32 and
be more cautious.

Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>

...

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Marc Zyngier 2017-03-27 17:03:43 +01:00 • committed by Christoffer Dall

parent e70b952263

commit b6b7a8069d

1 changed files with 16 additions and 11 deletions

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arch/arm64/kvm/sys_regs.c

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