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arm64: kvm: report original PAR_EL1 upon panic 

If we call __kvm_hyp_panic while a guest context is active, we call
__restore_sysregs before acquiring the system register values for the
panic, in the process throwing away the PAR_EL1 value at the point of
the panic.

This patch modifies __kvm_hyp_panic to stash the PAR_EL1 value prior to
restoring host register values, enabling us to report the original
values at the point of the panic.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Mark Rutland 2015-11-16 13:58:29 +00:00 committed by Christoffer Dall
parent 1d7a4e313a
commit fbb4574ce9
1 changed files with 5 additions and 1 deletions
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6
arch/arm64/kvm/hyp.S
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@ -864,6 +864,10 @@ ENTRY(__kvm_flush_vm_context)
ENDPROC(__kvm_flush_vm_context)
__kvm_hyp_panic:
// Stash PAR_EL1 before corrupting it in __restore_sysregs
mrs x0, par_el1
push x0, xzr
// Guess the context by looking at VTTBR:
// If zero, then we're already a host.
// Otherwise restore a minimal host context before panicing.
@ -898,7 +902,7 @@ __kvm_hyp_panic:
mrs x3, esr_el2
mrs x4, far_el2
mrs x5, hpfar_el2
mrs x6, par_el1
pop x6, xzr // active context PAR_EL1
mrs x7, tpidr_el2
mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\