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130 lines
5.0 KiB
Markdown
130 lines
5.0 KiB
Markdown
# Support for RISC-V QEMU virt platform
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## Overview
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RISC-V QEMU 'virt' is a generic platform which does not correspond to any real
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hardware.
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EDK2 for RISC-V virt platform is a payload (S-mode) for the previous stage M-mode
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firmware like OpenSBI. It follows PEI less design.
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The minimum QEMU version required is
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**[8.1](https://wiki.qemu.org/Planning/8.1)** or with commit
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[7efd65423a](https://github.com/qemu/qemu/commit/7efd65423ab22e6f5890ca08ae40c84d6660242f)
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which supports separate pflash devices for EDK2 code and variable storage.
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## Get edk2 sources
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git clone --recurse-submodule git@github.com:tianocore/edk2.git
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## Build
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### Using GCC toolchain
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**Prerequisite**: RISC-V GNU compiler toolchain should be installed.
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export WORKSPACE=`pwd`
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export GCC5_RISCV64_PREFIX=riscv64-linux-gnu-
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export PACKAGES_PATH=$WORKSPACE/edk2
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export EDK_TOOLS_PATH=$WORKSPACE/edk2/BaseTools
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source edk2/edksetup.sh --reconfig
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make -C edk2/BaseTools
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source edk2/edksetup.sh BaseTools
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build -a RISCV64 --buildtarget RELEASE -p OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc -t GCC5
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### Using CLANGDWARF toolchain (clang + lld)
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**Prerequisite**: LLVM toolchain with clang and lld should be installed.
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export WORKSPACE=`pwd`
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export CLANGDWARF_BIN=/usr/bin/
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export PACKAGES_PATH=$WORKSPACE/edk2
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export EDK_TOOLS_PATH=$WORKSPACE/edk2/BaseTools
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source edk2/edksetup.sh --reconfig
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make -C edk2/BaseTools
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source edk2/edksetup.sh BaseTools
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build -a RISCV64 --buildtarget RELEASE -p OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc -t CLANGDWARF
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After a successful build, two files namely **RISCV_VIRT_CODE.fd** and **RISCV_VIRT_VARS.fd** are created.
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## Test
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Below example shows how to boot openSUSE Tumbleweed E20.
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1) RISC-V QEMU pflash devices should be of of size 32MiB.
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`truncate -s 32M RISCV_VIRT_CODE.fd`
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`truncate -s 32M RISCV_VIRT_VARS.fd`
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2) Running QEMU
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qemu-system-riscv64 \
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-M virt,pflash0=pflash0,pflash1=pflash1,acpi=off \
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-m 4096 -smp 2 \
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-serial mon:stdio \
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-device virtio-gpu-pci -full-screen \
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-device qemu-xhci \
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-device usb-kbd \
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-device virtio-rng-pci \
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-blockdev node-name=pflash0,driver=file,read-only=on,filename=RISCV_VIRT_CODE.fd \
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-blockdev node-name=pflash1,driver=file,filename=RISCV_VIRT_VARS.fd \
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-netdev user,id=net0 \
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-device virtio-net-pci,netdev=net0 \
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-device virtio-blk-device,drive=hd0 \
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-drive file=openSUSE-Tumbleweed-RISC-V-E20-efi.riscv64.raw,format=raw,id=hd0
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Note: the `acpi=off` machine property is specified because Linux guest
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support for ACPI (that is, the ACPI consumer side) is a work in progress.
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Currently, `acpi=off` is recommended unless you are developing ACPI support
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yourself.
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3) Running QEMU with direct kernel boot
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The following example boots the same guest, but loads the kernel image and
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the initial RAM disk (which were extracted from
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`openSUSE-Tumbleweed-RISC-V-E20-efi.riscv64.raw`) from the host filesystem.
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It also sets the guest kernel command line on the QEMU command line.
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CMDLINE=(root=UUID=76d9b92d-09e9-4df0-8262-c1a7a466f2bc
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systemd.show_status=1
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ignore_loglevel
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console=ttyS0
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earlycon=uart8250,mmio,0x10000000)
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qemu-system-riscv64 \
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-M virt,pflash0=pflash0,pflash1=pflash1,acpi=off \
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-m 4096 -smp 2 \
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-serial mon:stdio \
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-device virtio-gpu-pci -full-screen \
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-device qemu-xhci \
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-device usb-kbd \
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-device virtio-rng-pci \
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-blockdev node-name=pflash0,driver=file,read-only=on,filename=RISCV_VIRT_CODE.fd \
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-blockdev node-name=pflash1,driver=file,filename=RISCV_VIRT_VARS.fd \
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-netdev user,id=net0 \
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-device virtio-net-pci,netdev=net0 \
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-device virtio-blk-device,drive=hd0 \
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-drive file=openSUSE-Tumbleweed-RISC-V-E20-efi.riscv64.raw,format=raw,id=hd0 \
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-kernel Image-6.5.2-1-default \
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-initrd initrd-6.5.2-1-default \
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-append "${CMDLINE[*]}"
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## Test with your own OpenSBI binary
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Using the above QEMU command lines, **RISCV_VIRT_CODE.fd** is launched by the
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OpenSBI binary that is bundled with QEMU. You can build your own OpenSBI binary
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as well:
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OPENSBI_DIR=...
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git clone https://github.com/riscv/opensbi.git $OPENSBI_DIR
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make -C $OPENSBI_DIR \
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-j $(getconf _NPROCESSORS_ONLN) \
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CROSS_COMPILE=riscv64-linux-gnu- \
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PLATFORM=generic
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then specify that binary for QEMU, with the following additional command line
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option:
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-bios $OPENSBI_DIR/build/platform/generic/firmware/fw_dynamic.bin
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Note that the above only makes a difference with software emulation (which you
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can force with `-M accel=tcg`). With hardware virtualization (`-M accel=kvm`),
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KVM services the SBI (Supervisor Binary Interface) calls internally, therefore
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any OpenSBI binary specified with `-bios` is rejected.
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