kvm: arm64: handle single-step of hyp emulated mmio instructions

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There is a fast-path of MMIO emulation inside hyp mode. The handling
of single-step is broadly the same as kvm_arm_handle_step_debug()
except we just setup ESR/HSR so handle_exit() does the correct thing
as we exit.

For the case of an emulated illegal access causing an SError we will
exit via the ARM_EXCEPTION_EL1_SERROR path in handle_exit(). We behave
as we would during a real SError and clear the DBG_SPSR_SS bit for the
emulated instruction.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

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Alex Bennée 2017-11-23 12:11:34 +00:00 • committed by Christoffer Dall

parent e70dce73be

commit e3feebf817

1 changed files with 30 additions and 7 deletions

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arch/arm64/kvm/hyp/switch.c

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