RISCV: Add kvm Sstc timer selftests

The RISC-V arch_timer selftests is used to validate Sstc timer functionality in a guest, which sets up periodic timer interrupts and check the basic interrupt status upon its receipt.

This KVM selftests was ported from aarch64 arch_timer and tested with Linux v6.7-rc8 on a Qemu riscv64 virt machine.

---
Changed since v4:
* Rebased to Linux 6.7-rc8
* Added new patch(2/12) to clean up the data type in struct test_args
* Re-ordered patch(11/11) in v4 to patch(3/12)
* Changed the timer_err_margin_us type from int to uint32_t

Haibo Xu (11):
KVM: arm64: selftests: Data type cleanup for arch_timer test
KVM: arm64: selftests: Enable tuning of error margin in arch_timer
test
KVM: arm64: selftests: Split arch_timer test code
KVM: selftests: Add CONFIG_64BIT definition for the build
tools: riscv: Add header file csr.h
tools: riscv: Add header file vdso/processor.h
KVM: riscv: selftests: Switch to use macro from csr.h
KVM: riscv: selftests: Add exception handling support
KVM: riscv: selftests: Add guest helper to get vcpu id
KVM: riscv: selftests: Change vcpu_has_ext to a common function
KVM: riscv: selftests: Add sstc timer test

Paolo Bonzini (1):
selftests/kvm: Fix issues with $(SPLIT_TESTS)

 tools/arch/riscv/include/asm/csr.h            | 541 ++++++++++++++++++
 tools/arch/riscv/include/asm/vdso/processor.h |  32 ++
 tools/testing/selftests/kvm/Makefile          |  27 +-
 .../selftests/kvm/aarch64/arch_timer.c        | 295 +---------
 tools/testing/selftests/kvm/arch_timer.c      | 259 +++++++++
 .../selftests/kvm/include/aarch64/processor.h |   4 -
 .../selftests/kvm/include/kvm_util_base.h     |   9 +
 .../selftests/kvm/include/riscv/arch_timer.h  |  71 +++
 .../selftests/kvm/include/riscv/processor.h   |  65 ++-
 .../testing/selftests/kvm/include/test_util.h |   2 +
 .../selftests/kvm/include/timer_test.h        |  45 ++
 .../selftests/kvm/lib/riscv/handlers.S        | 101 ++++
 .../selftests/kvm/lib/riscv/processor.c       |  87 +++
 .../testing/selftests/kvm/riscv/arch_timer.c  | 111 ++++
 .../selftests/kvm/riscv/get-reg-list.c        |  11 +-
 15 files changed, 1353 insertions(+), 307 deletions(-)
 create mode 100644 tools/arch/riscv/include/asm/csr.h
 create mode 100644 tools/arch/riscv/include/asm/vdso/processor.h
 create mode 100644 tools/testing/selftests/kvm/arch_timer.c
 create mode 100644 tools/testing/selftests/kvm/include/riscv/arch_timer.h
 create mode 100644 tools/testing/selftests/kvm/include/timer_test.h
 create mode 100644 tools/testing/selftests/kvm/lib/riscv/handlers.S
 create mode 100644 tools/testing/selftests/kvm/riscv/arch_timer.c

2.34.1