Commit fbb4574c authored by Mark Rutland's avatar Mark Rutland Committed by Christoffer Dall

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: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent 1d7a4e31
...@@ -864,6 +864,10 @@ ENTRY(__kvm_flush_vm_context) ...@@ -864,6 +864,10 @@ ENTRY(__kvm_flush_vm_context)
ENDPROC(__kvm_flush_vm_context) ENDPROC(__kvm_flush_vm_context)
__kvm_hyp_panic: __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: // Guess the context by looking at VTTBR:
// If zero, then we're already a host. // If zero, then we're already a host.
// Otherwise restore a minimal host context before panicing. // Otherwise restore a minimal host context before panicing.
...@@ -898,7 +902,7 @@ __kvm_hyp_panic: ...@@ -898,7 +902,7 @@ __kvm_hyp_panic:
mrs x3, esr_el2 mrs x3, esr_el2
mrs x4, far_el2 mrs x4, far_el2
mrs x5, hpfar_el2 mrs x5, hpfar_el2
mrs x6, par_el1 pop x6, xzr // active context PAR_EL1
mrs x7, tpidr_el2 mrs x7, tpidr_el2
mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\ mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment