PING Kind regards, Pavel Fedin Expert Engineer Samsung Electronics Research center Russia > -----Original Message----- > From: kvm-owner@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On Behalf Of Pavel Fedin > Sent: Tuesday, August 11, 2015 10:34 AM > To: kvmarm@xxxxxxxxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx > Cc: 'Christoffer Dall'; 'Marc Zyngier' > Subject: [PATCH] KVM: arm64: Decode basic HYP fault information > > Print exception vector name, exception class and PC translated to EL1 virtual > address. Significantly aids debugging HYP crashes without special means like > JTAG. > > Signed-off-by: Pavel Fedin <p.fedin@xxxxxxxxxxx> > --- > arch/arm64/kvm/handle_exit.c | 30 +++++++++++++++++++++++++++++ > arch/arm64/kvm/hyp.S | 46 +++++++++++++++++--------------------------- > 2 files changed, 48 insertions(+), 28 deletions(-) > > diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c > index 29b184a..4d70d64 100644 > --- a/arch/arm64/kvm/handle_exit.c > +++ b/arch/arm64/kvm/handle_exit.c > @@ -136,3 +136,33 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, > return 0; > } > } > + > +static const char *const hyp_faults[] = { > + "EL2t Synchronous", > + "EL2t IRQ", > + "EL2t FIQ", > + "EL2t Error", > + "EL2h Synchronous", > + "EL2h IRQ", > + "EL2h FIQ", > + "EL2h Error", > + "EL1 Synchronous", > + "EL1 IRQ", > + "EL1 FIQ", > + "EL1 Error" > +}; > + > +void kvm_hyp_panic(unsigned long vector, unsigned int spsr, unsigned long pc, > + unsigned int esr, unsigned long far, unsigned long hpfar, > + unsigned long par, struct kvm_vcpu *vcpu) > +{ > + pr_emerg("Unhandled HYP exception %s on VCPU %p\n", > + hyp_faults[vector], vcpu); > + pr_emerg("PC : %016lx SPSR : %08x ESR: %08x\n", pc, spsr, esr); > + pr_emerg("FAR: %016lx HPFAR: %016lx PAR: %016lx\n", far, hpfar, par); > + > + pr_emerg("Exception class: %02x Translated PC: %016lx\n", > + esr >> ESR_ELx_EC_SHIFT, pc - HYP_PAGE_OFFSET + PAGE_OFFSET); > + > + panic("HYP panic"); > +} > diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S > index c81eaaf..62785cd 100644 > --- a/arch/arm64/kvm/hyp.S > +++ b/arch/arm64/kvm/hyp.S > @@ -1060,13 +1060,11 @@ __kvm_hyp_panic: > ldr x2, [x0, #VCPU_HOST_CONTEXT] > kern_hyp_va x2 > > + mov x0, lr > bl __restore_sysregs > + mov lr, x0 > > -1: adr x0, __hyp_panic_str > - adr x1, 2f > - ldp x2, x3, [x1] > - sub x0, x0, x2 > - add x0, x0, x3 > +1: mov x0, lr > mrs x1, spsr_el2 > mrs x2, elr_el2 > mrs x3, esr_el2 > @@ -1078,20 +1076,11 @@ __kvm_hyp_panic: > mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\ > PSR_MODE_EL1h) > msr spsr_el2, lr > - ldr lr, =panic > + ldr lr, =kvm_hyp_panic > msr elr_el2, lr > eret > - > - .align 3 > -2: .quad HYP_PAGE_OFFSET > - .quad PAGE_OFFSET > ENDPROC(__kvm_hyp_panic) > > -__hyp_panic_str: > - .ascii "HYP panic:\nPS:%08x PC:%p ESR:%p\nFAR:%p HPFAR:%p PAR:%p\nVCPU:%p\n\0" > - > - .align 2 > - > /* > * u64 kvm_call_hyp(void *hypfn, ...); > * > @@ -1115,26 +1104,27 @@ ENTRY(kvm_call_hyp) > ret > ENDPROC(kvm_call_hyp) > > -.macro invalid_vector label, target > +.macro invalid_vector label, N, target > .align 2 > \label: > + mov lr, #\N > b \target > ENDPROC(\label) > .endm > > /* None of these should ever happen */ > - invalid_vector el2t_sync_invalid, __kvm_hyp_panic > - invalid_vector el2t_irq_invalid, __kvm_hyp_panic > - invalid_vector el2t_fiq_invalid, __kvm_hyp_panic > - invalid_vector el2t_error_invalid, __kvm_hyp_panic > - invalid_vector el2h_sync_invalid, __kvm_hyp_panic > - invalid_vector el2h_irq_invalid, __kvm_hyp_panic > - invalid_vector el2h_fiq_invalid, __kvm_hyp_panic > - invalid_vector el2h_error_invalid, __kvm_hyp_panic > - invalid_vector el1_sync_invalid, __kvm_hyp_panic > - invalid_vector el1_irq_invalid, __kvm_hyp_panic > - invalid_vector el1_fiq_invalid, __kvm_hyp_panic > - invalid_vector el1_error_invalid, __kvm_hyp_panic > + invalid_vector el2t_sync_invalid, 0, __kvm_hyp_panic > + invalid_vector el2t_irq_invalid, 1, __kvm_hyp_panic > + invalid_vector el2t_fiq_invalid, 2, __kvm_hyp_panic > + invalid_vector el2t_error_invalid, 3, __kvm_hyp_panic > + invalid_vector el2h_sync_invalid, 4, __kvm_hyp_panic > + invalid_vector el2h_irq_invalid, 5, __kvm_hyp_panic > + invalid_vector el2h_fiq_invalid, 6, __kvm_hyp_panic > + invalid_vector el2h_error_invalid, 7, __kvm_hyp_panic > + invalid_vector el1_sync_invalid, 8, __kvm_hyp_panic > + invalid_vector el1_irq_invalid, 9, __kvm_hyp_panic > + invalid_vector el1_fiq_invalid, 10, __kvm_hyp_panic > + invalid_vector el1_error_invalid, 11, __kvm_hyp_panic > > el1_sync: // Guest trapped into EL2 > push x0, x1 > -- > 2.4.4 > > > Kind regards, > Pavel Fedin > Expert Engineer > Samsung Electronics Research center Russia > > > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
