Re: [Qemu-devel] MTTCG External Halt

[Alistair Francis]

On Wed, Jan 31, 2018 at 10:48 AM, Peter Maydell
<address@hidden> wrote:
> On 31 January 2018 at 18:17, Alistair Francis <address@hidden> wrote:
>> On Wed, Jan 31, 2018 at 9:13 AM, Paolo Bonzini <address@hidden> wrote:
>>> cpu->halted = false likewise should not be needed here, but you cannot
>>> just clear CPU_INTERRUPT_HALT either.  You need to set a *different*
>>> interrupt request bit (the dummy CPU_INTERRUPT_EXITTB will do) and
>>> cpu_handle_halt will clear cpu->halted.
>>
>> The problem with that is that I hit this assert for ARM CPUs:
>>
>> qemu-system-aarch64: ./target/arm/cpu.h:1446: arm_el_is_aa64:
>> Assertion `el >= 1 && el <= 3' failed.
>
> Backtrace from when you hit that might be useful...

Here it is:

(gdb) bt
#0  0x00007ffff1a030bb in __GI_raise (address@hidden) at
../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff1a04f5d in __GI_abort () at abort.c:90
#2  0x00007ffff19faf17 in __assert_fail_base (fmt=<optimized out>,
address@hidden "el >= 1 && el <= 3",
address@hidden
"/scratch/alistai/master-qemu/target/arm/cpu.h", address@hidden,
address@hidden <__PRETTY_FUNCTION__.24916>
"arm_el_is_aa64") at assert.c:92
#3  0x00007ffff19fafc2 in __GI___assert_fail
(address@hidden "el >= 1 && el <= 3",
address@hidden
"/scratch/alistai/master-qemu/target/arm/cpu.h", address@hidden,
address@hidden <__PRETTY_FUNCTION__.24916>
"arm_el_is_aa64") at assert.c:101
#4  0x00005555557eb872 in arm_el_is_aa64 (el=0, env=0x55555723c7f8) at
/scratch/alistai/master-qemu/target/arm/cpu.h:1446
#5  0x0000555555951233 in arm_el_is_aa64 (el=0, env=0x55555723c7f8) at
/scratch/alistai/master-qemu/target/arm/cpu.h:1838
#6  0x0000555555951233 in arm_cpu_do_interrupt (cs=0x555557234550) at
/scratch/alistai/master-qemu/target/arm/helper.c:8020
#7  0x000055555585e75b in cpu_handle_exception (ret=<synthetic
pointer>, cpu=0x555556c64200)
    at /scratch/alistai/master-qemu/accel/tcg/cpu-exec.c:532
#8  0x000055555585e75b in cpu_exec (address@hidden) at
/scratch/alistai/master-qemu/accel/tcg/cpu-exec.c:748
#9  0x000055555582d963 in tcg_cpu_exec (cpu=0x555557234550) at
/scratch/alistai/master-qemu/cpus.c:1297
#10 0x000055555582d963 in qemu_tcg_cpu_thread_fn (arg=0x555557234550)
at /scratch/alistai/master-qemu/cpus.c:1502
#11 0x00007ffff1db37fc in start_thread (arg=0x7ffef6b43700) at
pthread_create.c:465
#12 0x00007ffff1ae0b5f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Alistair

>
> thanks
> -- PMM