Re: [Qemu-devel] [PATCH RFC V2 4/4] Add virtv2 machine that uses GIC-500

[Shlomo Pongratz]

On Thursday, May 7, 2015, Pavel Fedin <address@hidden> wrote:
> Hello!
>
> > The issue is similar to what you have noticed.
>
>  In this case it's probably not your fault.
>
> > The larger the number of smp cores it is more likely that the boot will get stuck.
> > I've commuted this patch series as an RFC because of this issue.
>
>  I have tried to give more testing to it. Up to 4 CPUs worked okay (if we ignore "press any key" problem which i described). Starting from 5 i get a hard freeze right after " SMP: Total of N processors activated" message. However, i get this deadlock also with GICv2, so it's perhaps not your fault. The second problem is that i did not manage to bring up more than 8 CPUs. The following happens:
> --- cut ---
> Initializing cgroup subsys memory
> Initializing cgroup subsys hugetlb
> hw perfevents: no hardware support available
> EFI services will not be available.
> CPU1: Booted secondary processor
> Detected PIPT I-cache on CPU1
> CPU1: found redistributor 1 region 0:0x0000000008060000
> CPU2: Booted secondary processor
> Detected PIPT I-cache on CPU2
> CPU2: found redistributor 2 region 0:0x0000000008080000
> CPU3: Booted secondary processor
> Detected PIPT I-cache on CPU3
> CPU3: found redistributor 3 region 0:0x00000000080a0000
> CPU4: Booted secondary processor
> Detected PIPT I-cache on CPU4
> CPU4: found redistributor 4 region 0:0x00000000080c0000
> CPU5: Booted secondary processor
> Detected PIPT I-cache on CPU5
> CPU5: found redistributor 5 region 0:0x00000000080e0000
> CPU6: Booted secondary processor
> Detected PIPT I-cache on CPU6
> CPU6: found redistributor 6 region 0:0x0000000008100000
> CPU7: Booted secondary processor
> Detected PIPT I-cache on CPU7
> CPU7: found redistributor 7 region 0:0x0000000008120000
> psci: failed to boot CPU8 (-22)
> CPU8: failed to boot: -22
> psci: failed to boot CPU9 (-22)
> CPU9: failed to boot: -22
> psci: failed to boot CPU10 (-22)
> CPU10: failed to boot: -22
> psci: failed to boot CPU11 (-22)
> CPU11: failed to boot: -22
> psci: failed to boot CPU12 (-22)
> CPU12: failed to boot: -22
> psci: failed to boot CPU13 (-22)
> CPU13: failed to boot: -22
> psci: failed to boot CPU14 (-22)
> CPU14: failed to boot: -22
> psci: failed to boot CPU15 (-22)
> CPU15: failed to boot: -22
> Brought up 8 CPUs
> SMP: Total of 8 processors activated.
> --- cut ---
>  But, perhaps it's the fault of my code (i replaced your patch No 4 with my own implementation, merging the code). I will post this alternative version soon if you don't mind (need to rebase it on master).
>
>  My current guest kernel is v3.19.5. I will test on 4.1rc2 soon.
>
> Kind regards,
> Pavel Fedin
> Expert Engineer
> Samsung Electronics Research center Russia

Hi Pavel,

Check your code and see if in fdt_add_cpu_nodes and see if CPUs are added with correct MPIDR (Affinity).

Best regards,

S.P.