On Thu, Mar 17, 2022 at 8:23 AM Tomasz Jeznach <tjezn...@rivosinc.com> wrote: > > This is the series of patches to introduce RISC-V IOMMU emulation in QEMU. > > The Rivos IOMMU device implementation is based on a draft proposal of a > RISC-V I/O Management Unit (IOMMU) [1] as published on 2022/03/10, shared and > discussed with RISCV-V IOMMU Task Group [2].
Awesome! > > Specification is in *draft* stage and is expected to be changed based on > discussion and feedback received from RISC-V IOMMU TG. So I'm assuming this will become a "RISC-V IOMMU" and not a "Rivos IOMMU" as the spec progresses? > > This series enables rivos-iommu support for riscv/virt machine emulation. > With corresponding Linux kernel driver and (modified) pending AIA-IMSIC > support [3] QEMU is able to boot into Linux with I/O protection enabled for > PCIe devices. Without AIA-IMSIC support interrupt based I/O translation fault > reporting and MSI remapping features are not available, while all remaining > IOMMU features are active. > > To enable IOMMU in QEMU add 'rivos-iommu' to the device list for 'virt' > machine > emulation. Cool! So one thought, if a user is expected to enable the IOMMU, AIA and other options in the virt machine it might be worthwhile adding a coverall option. So for example a user could do -machine virt,full-virt=true and that would enable the IOMMU, AIA and other important virtulisation features. Alistair > > > [1] > https://docs.google.com/document/d/1ytBZ6eDk1pAeBlZjDvm6_qqJbKQ0fMYKedyx0uoAGB0/view > [2] https://lists.riscv.org/g/tech-iommu/message/3 > [3] > https://lore.kernel.org/qemu-devel/20220220085526.808674-1-a...@brainfault.org > > Tomasz Jeznach (2): > hw/riscv: rivos-iommu: Baseline implementation of RIVOS IOMMU. > hw/riscv: virt: Add rivos-iommu device to 'virt' machine. > > hw/riscv/Kconfig | 4 + > hw/riscv/meson.build | 1 + > hw/riscv/rivos_iommu.c | 1350 ++++++++++++++++++++++++++++++++ > hw/riscv/trace-events | 7 + > hw/riscv/trace.h | 2 + > hw/riscv/virt.c | 115 ++- > include/hw/pci/pci_ids.h | 1 + > include/hw/riscv/rivos_iommu.h | 80 ++ > include/hw/riscv/virt.h | 2 + > meson.build | 1 + > 10 files changed, 1539 insertions(+), 24 deletions(-) > create mode 100644 hw/riscv/rivos_iommu.c > create mode 100644 hw/riscv/trace-events > create mode 100644 hw/riscv/trace.h > create mode 100644 include/hw/riscv/rivos_iommu.h > > -- > 2.25.1 > >
