Re: [PATCH v10 0/5] QEMU RISC-V AIA support

[Alistair Francis <alistair23@gmail.com>]

On Sun, Feb 20, 2022 at 6:57 PM Anup Patel <anup@brainfault.org> wrote:
>
> From: Anup Patel <anup.patel@wdc.com>
>
> The advanced interrupt architecture (AIA) extends the per-HART local
> interrupt support. Along with this, it also adds IMSIC (MSI contrllor)
> and Advanced PLIC (wired interrupt controller).
>
> The latest AIA draft specification can be found here:
> https://github.com/riscv/riscv-aia/releases/download/0.2-draft.28/riscv-interrupts-028.pdf
>
> This series adds RISC-V AIA support in QEMU which includes emulating all
> AIA local CSRs, APLIC, and IMSIC. Only AIA local interrupt filtering is
> not implemented because we don't have any local interrupt greater than 12.
>
> To enable AIA in QEMU, use one of the following:
> 1) Only AIA local interrupt CSRs: Pass "x-aia=true" as CPU paramenter
>    in the QEMU command-line
> 2) Only APLIC for virt machine: Pass "aia=aplic" as machine parameter
>    in the QEMU command-line
> 3) Both APLIC and IMSIC for virt machine: Pass "aia=aplic-imsic" as
>    machine parameter in the QEMU command-line
> 4) Both APLIC and IMSIC with 2 guest files for virt machine: Pass
>    "aia=aplic-imsic,aia-guests=2" as machine parameter in the QEMU
>    command-line
>
> To test series, we require Linux with AIA support which can be found in:
> riscv_aia_v1 branch at https://github.com/avpatel/linux.git
>
> This series can be found riscv_aia_v10 branch at:
> https://github.com/avpatel/qemu.git
>
> Changes since v9:
>  - Rebased on latest riscv-to-apply.next branch of Alistair's repo
>  - Removed first 18 PATCHs since these are already merged
>  - Fixed 32-bit system compile error in PATCH3
>
> Changes since v8:
>  - Use error_setg() in riscv_imsic_realize() added by PATCH20
>
> Changes since v7:
>  - Rebased on latest riscv-to-apply.next branch of Alistair's repo
>  - Improved default priority assignment in PATCH9
>
> Changes since v6:
>  - Fixed priority comparison in riscv_cpu_pending_to_irq() of PATCH9
>  - Fixed typos in comments added by PATCH11
>  - Added "pend = true;" for CSR_MSETEIPNUM case of rmw_xsetclreinum()
>    in PATCH15
>  - Handle ithreshold == 0 case in riscv_aplic_idc_topi() of PATCH18
>  - Allow setting pending bit for Level0 or Level1 interrupts in
>    riscv_aplic_set_pending() of PATCH18
>  - Force DOMAINCFG[31:24] bits to 0x80 in riscv_aplic_read() of PATCH18
>  - For APLIC direct mode, set target.iprio to 1 when zero is writtern
>    in PATCH18
>  - Handle eithreshold == 0 case in riscv_imsic_topei() of PATCH20
>
> Changes since v5:
>  - Moved VSTOPI_NUM_SRCS define to top of the file in PATCH13
>  - Fixed typo in PATCH16
>
> Changes since v4:
>  - Changed IRQ_LOCAL_MAX to 16 in PATCH2
>  - Fixed typo in PATCH10
>  - Replaced TARGET_LONG_BITS with riscv_cpu_mxl_bits(env) in PATCH11
>  - Replaced TARGET_LONG_BITS with riscv_cpu_mxl_bits(env) in PATCH14
>  - Replaced TARGET_LONG_BITS with riscv_cpu_mxl_bits(env) in PATCH15
>  - Replaced TARGET_LONG_BITS with xlen passed via ireg callback in PATCH20
>  - Retrict maximum IMSIC guest files per-HART of virt machine to 7 in
>    PATCH21.
>  - Added separate PATCH23 to increase maximum number of allowed CPUs
>    for virt machine
>
> Changes since v3:
>  - Replaced "aplic,xyz" and "imsic,xyz" DT properties with "riscv,xyz"
>    DT properties because "aplic" and "imsic" are not valid vendor names
>    required by Linux DT schema checker.
>
> Changes since v2:
>  - Update PATCH4 to check and inject interrupt after V=1 when
>    transitioning from V=0 to V=1
>
> Changes since v1:
>  - Revamped whole series and created more granular patches
>  - Added HGEIE and HGEIP CSR emulation for H-extension
>  - Added APLIC emulation
>  - Added IMSIC emulation
>
> Anup Patel (5):
>   hw/riscv: virt: Add optional AIA APLIC support to virt machine
>   hw/intc: Add RISC-V AIA IMSIC device emulation
>   hw/riscv: virt: Add optional AIA IMSIC support to virt machine
>   docs/system: riscv: Document AIA options for virt machine
>   hw/riscv: virt: Increase maximum number of allowed CPUs

Thanks!

Applied to riscv-to-apply.next

Alistair

>
>  docs/system/riscv/virt.rst    |  16 +
>  hw/intc/Kconfig               |   3 +
>  hw/intc/meson.build           |   1 +
>  hw/intc/riscv_imsic.c         | 448 ++++++++++++++++++++++
>  hw/riscv/Kconfig              |   2 +
>  hw/riscv/virt.c               | 698 ++++++++++++++++++++++++++++------
>  include/hw/intc/riscv_imsic.h |  68 ++++
>  include/hw/riscv/virt.h       |  41 +-
>  8 files changed, 1156 insertions(+), 121 deletions(-)
>  create mode 100644 hw/intc/riscv_imsic.c
>  create mode 100644 include/hw/intc/riscv_imsic.h
>
> --
> 2.25.1
>
>