tree 01bf04b516248c7632290adf8cc53b6e351a6f60
parent 2ea659a9ef488125eb46da6eb571de5eae5c43f6
author James Morse <james.morse@arm.com> 1493139764 +0100
committer Christoffer Dall <cdall@linaro.org> 1494921264 +0200

KVM: arm: Restore banked registers and physical timer access on hyp_panic()

When KVM panics, it hurridly restores the host context and parachutes
into the host's panic() code. This looks like it was copied from arm64,
the 32bit KVM panic code needs to restore the host's banked registers
too.

At some point panic() touches the physical timer/counter, this will
trap back to HYP. If we're lucky, we panic again.

Add a __timer_save_state() call to KVMs hyp_panic() path, this saves the
guest registers and disables the traps for the host.

Fixes: c36b6db5f3e4 ("ARM: KVM: Add panic handling code")
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>