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Diffstat (limited to 'docs/system/riscv/virt.rst')
| -rw-r--r-- | docs/system/riscv/virt.rst | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst index 9a06f95..6085097 100644 --- a/docs/system/riscv/virt.rst +++ b/docs/system/riscv/virt.rst @@ -84,6 +84,25 @@ none``, as in Firmware images used for pflash must be exactly 32 MiB in size. +riscv-iommu support +------------------- + +The board has support for the riscv-iommu-pci device by using the following +command line: + +.. code-block:: bash + + $ qemu-system-riscv64 -M virt -device riscv-iommu-pci (...) + +It also has support for the riscv-iommu-sys platform device: + +.. code-block:: bash + + $ qemu-system-riscv64 -M virt,iommu-sys=on (...) + +Refer to :ref:`riscv-iommu` for more information on how the RISC-V IOMMU support +works. + Machine-specific options ------------------------ @@ -110,12 +129,23 @@ The following machine-specific options are supported: MSIs. When not specified, this option is assumed to be "none" which selects SiFive PLIC to handle wired interrupts. + This option also interacts with '-accel kvm'. When using "aia=aplic-imsic" + with KVM, it is possible to set the use of the kernel irqchip in split mode + by using "-accel kvm,kernel-irqchip=split". In this case the ``virt`` machine + will emulate the APLIC controller instead of using the APLIC controller from + the irqchip. See :ref:`riscv-aia` for more details on all available AIA + modes. + - aia-guests=nnn The number of per-HART VS-level AIA IMSIC pages to be emulated for a guest having AIA IMSIC (i.e. "aia=aplic-imsic" selected). When not specified, the default number of per-HART VS-level AIA IMSIC pages is 0. +- iommu-sys=[on|off] + + Enables the riscv-iommu-sys platform device. Defaults to 'off'. + Running Linux kernel -------------------- |