[PATCH v3 0/9] RISC-V SBI debug console extension support

[Anup Patel]

On Fri, Oct 20, 2023 at 12:51 PM Anup Patel <apatel at ventanamicro.com> wrote:
>
> The SBI v2.0 specification is now frozen. The SBI v2.0 specification defines
> SBI debug console (DBCN) extension which replaces the legacy SBI v0.1
> functions sbi_console_putchar() and sbi_console_getchar().
> (Refer v2.0-rc5 at https://github.com/riscv-non-isa/riscv-sbi-doc/releases)
>
> This series adds support for SBI debug console (DBCN) extension in KVM RISC-V
> and Linux RISC-V.
>
> To try these patches with KVM RISC-V, use KVMTOOL from riscv_sbi_dbcn_v1
> branch at: https://github.com/avpatel/kvmtool.git
>
> These patches can also be found in the riscv_sbi_dbcn_v3 branch at:
> https://github.com/avpatel/linux.git
>
> Changes since v2:
>  - Rebased on Linux-6.6-rc5
>  - Handled page-crossing in PATCH7 of v2 series
>  - Addressed Drew's comment in PATCH3 of v2 series
>  - Added new PATCH5 to make get-reg-list test aware of SBI DBCN extension
>
> Changes since v1:
>  - Remove use of #ifdef from PATCH4 and PATCH5 of the v1 series
>  - Improved commit description of PATCH3 in v1 series
>  - Introduced new PATCH3 in this series to allow some SBI extensions
>    (such as SBI DBCN) do to disabled by default so that older KVM user space
>    work fine and newer KVM user space have to explicitly opt-in for emulating
>    SBI DBCN.
>  - Introduced new PATCH5 in this series which adds inline version of
>    sbi_console_getchar() and sbi_console_putchar() for the case where
>    CONFIG_RISCV_SBI_V01 is disabled.
>
> Anup Patel (8):
>   RISC-V: Add defines for SBI debug console extension
>   RISC-V: KVM: Change the SBI specification version to v2.0
>   RISC-V: KVM: Allow some SBI extensions to be disabled by default
>   RISC-V: KVM: Forward SBI DBCN extension to user-space
>   KVM: riscv: selftests: Add SBI DBCN extension to get-reg-list test
>   RISC-V: Add stubs for sbi_console_putchar/getchar()
>   tty/serial: Add RISC-V SBI debug console based earlycon
>   RISC-V: Enable SBI based earlycon support
>
> Atish Patra (1):
>   tty: Add SBI debug console support to HVC SBI driver

Queued PATCH1 to PATCH5 for Linux-6.7

Remaining PATCH6 to PATCH9 are still under review.

Thanks,
Anup

>
>  arch/riscv/configs/defconfig                  |  1 +
>  arch/riscv/configs/rv32_defconfig             |  1 +
>  arch/riscv/include/asm/kvm_vcpu_sbi.h         |  7 +-
>  arch/riscv/include/asm/sbi.h                  | 12 +++
>  arch/riscv/include/uapi/asm/kvm.h             |  1 +
>  arch/riscv/kvm/vcpu.c                         |  6 ++
>  arch/riscv/kvm/vcpu_sbi.c                     | 61 +++++++-------
>  arch/riscv/kvm/vcpu_sbi_replace.c             | 32 ++++++++
>  drivers/tty/hvc/Kconfig                       |  2 +-
>  drivers/tty/hvc/hvc_riscv_sbi.c               | 82 +++++++++++++++++--
>  drivers/tty/serial/Kconfig                    |  2 +-
>  drivers/tty/serial/earlycon-riscv-sbi.c       | 32 +++++++-
>  .../selftests/kvm/riscv/get-reg-list.c        |  2 +
>  13 files changed, 198 insertions(+), 43 deletions(-)
>
> --
> 2.34.1
>
>
> --
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