On 2018-01-29 11:25, Ralf Ramsauer wrote: > Hi Claudio, > > On 01/29/2018 10:15 AM, Claudio Scordino wrote: >> Hi all, >> >> I'm porting Jailhouse on the imx8 EVK board. >> >> After implementing the uart driver (thanks, Ralf) I've been able of >> successfully running the "jailhouse enable" command. >> >> However, the "jailhouse cell create" deadlocks the machine with the >> following error message: >> >> FATAL: unhandled trap (exception class 0x17) > This means Jailhouse is missing a trap handler (see > hypervisor/arch/arm64/traps.c:185). > > The exception class 0x17 stands for: > hypervisor/arch/arm64/include/asm/sysregs.h:#define ESR_EC_SMC64 > 0x17 > > So we're missing a PSCI handler, because this is the only path in > handle_smc() that can return TRAP_UNHANDLED: > if (!IS_PSCI_32(regs[0]) && !IS_PSCI_64(regs[0])) > return TRAP_UNHANDLED; > > And those definitions are: > hypervisor/arch/arm-common/include/asm/psci.h:#define IS_PSCI_32(hvc) > (((hvc) >> 24) == 0x84) > hypervisor/arch/arm-common/include/asm/psci.h:#define IS_PSCI_64(hvc) > (((hvc) >> 24) == 0xc4) > > So looks like we have some unimplemented PSCI/SMC call. >> Cell state before exception: >> pc: ffff00000808eb60 lr: ffff00000852cbf8 spsr: 200001c5 EL1 > What's behind PC? Could you also share your config with us? >> sp: ffff8000b20afbe0 esr: 17 1 0000000 >> x0: 00000000c2000000 x1: 0000000000000004 x2: 0000000000000040 > PSCI calls store their function id in x0. > > And here we have 0xc2000000. In case of SMC64, we shr by 24 bits, which > means 0xc2000000 >> 24 = 0xc2 Jailhouse expects 0xc4 in case of PSCI. Hmm. > > So this doesn't look like a typical PSCI call to me (just looked at the > PSCI platform design document, 0xc2000000 is not valid). Looks like this > is some other platform specific SMC. Is there another monitor running? > > So who emits this call?
"#define CONFIG_CRASH_CELL_ON_PANIC 1" will tell us because Linux will generate a backtrace on this provoked crash. > > Just a guess: your root cell is probably trying to offline the CPU, > emits the PSCI and crashes. - power management - some driver that is implemented in firmware instead of Linux (we have this with the RTC and nice UEFI firmware on the Seattle) Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to jailhouse-dev+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
