From: Mark Rutland <mark.rutl...@arm.com>
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.zyng...@arm.com>
Signed-off-by: Mark Rutland <mark.rutl...@arm.com>
Signed-off-by: Christoffer Dall <christoffer.d...@linaro.org>
---
arch/arm64/kvm/hyp.S | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
index ce70817..86c2898 100644
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -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 |\
--
2.1.2.330.g565301e.dirty
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