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authorMark Rutland <mark.rutland@arm.com>2015-11-16 13:58:29 +0000
committerAlex Shi <alex.shi@linaro.org>2016-05-24 16:38:33 +0800
commit8803d251328418ebf09140cbe930b698ef6441f4 (patch)
tree632515558f01aebccc89d4d3a0327acba1fecce6
parentbf0c213d6900f7446997645c4696da05aaeb6264 (diff)
downloadlinux-linaro-stable-8803d251328418ebf09140cbe930b698ef6441f4.tar.gz
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> (cherry picked from commit fbb4574ce9a37e15a9872860bf202f2be5bdf6c4) Signed-off-by: Alex Shi <alex.shi@linaro.org>
-rw-r--r--arch/arm64/kvm/hyp.S6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
index 6288cd6..4c1786e 100644
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -820,6 +820,10 @@ 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.
@@ -846,7 +850,7 @@ __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 |\