On 28.05.22 21:13, Lad, Prabhakar wrote: > Hi Jan, > > On Sat, May 28, 2022 at 3:41 PM Jan Kiszka <[email protected]> wrote: >> >> On 28.05.22 15:22, Lad, Prabhakar wrote: >>> On Fri, May 27, 2022 at 6:07 AM Jan Kiszka <[email protected]> wrote: >>>> >>>> If that should be the case, you could use the JTAG to "trace" how far >>>> you get: Add an infinite loop at some point the setup should get along, >>>> and then check with the debugger if PC points to that address and if EL2 >>>> is active. With that, you could also check if the UART print-out is >>>> executed. >>>> >>> After tracing back I see it's looping infinitely somewhere in the >>> hypervisor.o file, below is the code where it repeatedly loops. >>> >>> ffffc0209550: b9400680 ldr w0, [x20, #4] >>> ffffc0209554: b9403481 ldr w1, [x4, #52] >>> ffffc0209558: 6b00003f cmp w1, w0 >>> ffffc020955c: 540013a8 b.hi ffffc02097d0 <entry+0x2d8> >>> ..... >>> ffffc02097d0: 17ffff60 b ffffc0209550 <entry+0x58> >>> >>> I haven't managed to find where exactly in the C file this is >>> happening yet. Any thoughts on what could be happening? >>> >> >> That's very likely >> >> while (entered_cpus < hypervisor_header.online_cpus) >> cpu_relax(); >> > Thanks for the pointer really appreciated. > >> Did you configure more CPUs than there are in the system? >> > No I haven't, I've set it up as cpus = 0x3f for 6 CPUs (2xa57 + > 4xa53). I don't know what was happening there when I removed the > infinite loop (which I used for break point) from entry.S that went > OK. There was also an issue with the debug uart driver which I've > fixed and able to get the prints now. > > So now moving forward I am seeing "Unhandled data read"! > > Looking at the address for Unhandled data read one belongs to GIC > (0xf102f00c) and the other one belongs to the debug uart (0xe6e88008).
Regarding GICC access: Try setting gicc_base to 0xf102f000 in the root cell config. Regarding the UART: Do you pass that address through to the root cell as well? It's generally fine to allow both hypervisor and one cell to access the UART in parallel. Otherwise, disable UART usage by the root cell prior to enabling Jailhouse. Jan -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jailhouse-dev/1a407933-180e-48fa-760c-1c90e159eb2f%40web.de.
