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

Jisheng Zhang
2022-08-31T18:08:52Z

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

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(-)

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2.34.1