Re: [PATCH v2 0/5] riscv: add PREEMPT_RT support

Conor.Dooley
2022-09-01T16:42:33Z

On 31/08/2022 18:59, Jisheng Zhang wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> This series is to add PREEMPT_RT support to riscv:
> patch1 adds the missing number of signal exits in vCPU stat
> patch2 switches to the generic guest entry infrastructure
> patch3 select HAVE_POSIX_CPU_TIMERS_TASK_WORK which is a requirement for
> RT
> patch4 adds lazy preempt support
> patch5 allows to enable PREEMPT_RT
>

What version of the preempt_rt patch did you test this with?

Maybe I am missing something, but I gave this a whirl with
v6.0-rc3 + v6.0-rc3-rt5 & was meant by a bunch of complaints.
I am not familiar with the preempt_rt patch, so I am not sure what
level of BUG()s or WARNING()s are to be expected, but I saw a fair
few...

Thanks,
Conor.

> I assume patch1, patch2 and patch3 can be reviewed and merged for
> riscv-next, patch4 and patch5 can be reviewed and maintained in rt tree,
> and finally merged once the remaining patches in rt tree are all
> mainlined.
>
> Since v1:
> - send to related maillist, I press ENTER too quickly when sending v1
> - remove the signal_pending() handling because that's covered by
> generic guest entry infrastructure
>
> Jisheng Zhang (5):
> RISC-V: KVM: Record number of signal exits as a vCPU stat
> RISC-V: KVM: Use generic guest entry infrastructure
> riscv: select HAVE_POSIX_CPU_TIMERS_TASK_WORK
> riscv: add lazy preempt support
> riscv: Allow to enable RT
>
> arch/riscv/Kconfig | 3 +++
> arch/riscv/include/asm/kvm_host.h | 1 +
> arch/riscv/include/asm/thread_info.h | 7 +++++--
> arch/riscv/kernel/asm-offsets.c | 1 +
> arch/riscv/kernel/entry.S | 9 +++++++--
> arch/riscv/kvm/Kconfig | 1 +
> arch/riscv/kvm/vcpu.c | 18 +++++++-----------
> 7 files changed, 25 insertions(+), 15 deletions(-)
>
> --
> 2.34.1
>
>
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