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| author | Marc Zyngier <marc.zyngier@arm.com> | 2016-01-06 12:12:42 +0300 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 21:34:14 +0300 |
| commit | c36b6db5f3e4c1bd21659aee8e67226352d254ae (patch) | |
| tree | f4a002e0cc3e0876a29724bdf25e534720a11eb5 /arch/arm/kvm/hyp | |
| parent | bafc6c2a22553193d1d1ce83783b7faa0924158e (diff) | |
| download | linux-c36b6db5f3e4c1bd21659aee8e67226352d254ae.tar.xz | |
ARM: KVM: Add panic handling code
Instead of spinning forever, let's "properly" handle any unexpected
exception ("properly" meaning "print a spat on the console and die").
This has proved useful quite a few times...
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm/kvm/hyp')
| -rw-r--r-- | arch/arm/kvm/hyp/hyp-entry.S | 28 | ||||
| -rw-r--r-- | arch/arm/kvm/hyp/switch.c | 38 |
2 files changed, 59 insertions, 7 deletions
diff --git a/arch/arm/kvm/hyp/hyp-entry.S b/arch/arm/kvm/hyp/hyp-entry.S index 1b4aa02fd364..54a8d67ad980 100644 --- a/arch/arm/kvm/hyp/hyp-entry.S +++ b/arch/arm/kvm/hyp/hyp-entry.S @@ -75,15 +75,29 @@ __kvm_hyp_vector: .macro invalid_vector label, cause .align -\label: b . +\label: mov r0, #\cause + b __hyp_panic .endm - invalid_vector hyp_reset - invalid_vector hyp_undef - invalid_vector hyp_svc - invalid_vector hyp_pabt - invalid_vector hyp_dabt - invalid_vector hyp_fiq + invalid_vector hyp_reset ARM_EXCEPTION_RESET + invalid_vector hyp_undef ARM_EXCEPTION_UNDEFINED + invalid_vector hyp_svc ARM_EXCEPTION_SOFTWARE + invalid_vector hyp_pabt ARM_EXCEPTION_PREF_ABORT + invalid_vector hyp_dabt ARM_EXCEPTION_DATA_ABORT + invalid_vector hyp_fiq ARM_EXCEPTION_FIQ + +ENTRY(__hyp_do_panic) + mrs lr, cpsr + bic lr, lr, #MODE_MASK + orr lr, lr, #SVC_MODE +THUMB( orr lr, lr, #PSR_T_BIT ) + msr spsr_cxsf, lr + ldr lr, =panic + msr ELR_hyp, lr + ldr lr, =kvm_call_hyp + clrex + eret +ENDPROC(__hyp_do_panic) hyp_hvc: /* diff --git a/arch/arm/kvm/hyp/switch.c b/arch/arm/kvm/hyp/switch.c index 0dd0ba33b8a7..abbe90b5f2ff 100644 --- a/arch/arm/kvm/hyp/switch.c +++ b/arch/arm/kvm/hyp/switch.c @@ -192,3 +192,41 @@ again: } __alias(__guest_run) int __weak __kvm_vcpu_run(struct kvm_vcpu *vcpu); + +static const char * const __hyp_panic_string[] = { + [ARM_EXCEPTION_RESET] = "\nHYP panic: RST PC:%08x CPSR:%08x", + [ARM_EXCEPTION_UNDEFINED] = "\nHYP panic: UNDEF PC:%08x CPSR:%08x", + [ARM_EXCEPTION_SOFTWARE] = "\nHYP panic: SVC PC:%08x CPSR:%08x", + [ARM_EXCEPTION_PREF_ABORT] = "\nHYP panic: PABRT PC:%08x CPSR:%08x", + [ARM_EXCEPTION_DATA_ABORT] = "\nHYP panic: DABRT PC:%08x ADDR:%08x", + [ARM_EXCEPTION_IRQ] = "\nHYP panic: IRQ PC:%08x CPSR:%08x", + [ARM_EXCEPTION_FIQ] = "\nHYP panic: FIQ PC:%08x CPSR:%08x", + [ARM_EXCEPTION_HVC] = "\nHYP panic: HVC PC:%08x CPSR:%08x", +}; + +void __hyp_text __noreturn __hyp_panic(int cause) +{ + u32 elr = read_special(ELR_hyp); + u32 val; + + if (cause == ARM_EXCEPTION_DATA_ABORT) + val = read_sysreg(HDFAR); + else + val = read_special(SPSR); + + if (read_sysreg(VTTBR)) { + struct kvm_vcpu *vcpu; + struct kvm_cpu_context *host_ctxt; + + vcpu = (struct kvm_vcpu *)read_sysreg(HTPIDR); + host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); + __deactivate_traps(vcpu); + __deactivate_vm(vcpu); + __sysreg_restore_state(host_ctxt); + } + + /* Call panic for real */ + __hyp_do_panic(__hyp_panic_string[cause], elr, val); + + unreachable(); +} |