mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
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This is an *experimental* port of OVMF for the QEMU microvm
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machine type.
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microvm background info
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-----------------------
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microvm is designed for modern, virtio-based workloads. Most legacy
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lpc/isa devices like pit and pic can be turned off. virtio-mmio
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(i.e. '-device virtio-{blk,net,scsi,...}-device') is used for
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storage/network/etc.
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Optional pcie support is available and any pcie device supported by
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QEMU can be plugged in (including virtio-pci if you prefer that over
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virtio-mmio).
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https://qemu.readthedocs.io/en/latest/system/i386/microvm.html
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https://www.kraxel.org/blog/2020/10/qemu-microvm-acpi/
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design issues
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-------------
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Not fully clear yet how to do hardware detection best. Right now
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using device tree to find virtio-mmio devices and pcie host bridge,
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can reuse existing ArmVirtPkg code that way. Needs patched QEMU.
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features
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--------
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[working] serial console
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[working] direct kernel boot
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[working] virtio-mmio support
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[working] pcie support
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known limitations
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-----------------
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* rtc=on is required for now.
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* can't use separate code/vars (actually an microvm limitation,
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there is no pflash support).
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* transitional virtio-pci devices do not work. microvm doesn't
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support ioports on pcie, and ovmf doesn't initialize pcie devices
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with ioports if there is no address space for them (even though
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pcie devices are required to be functional without ioports).
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usage
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-----
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qemu-system-x86_64 \
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-nographic \
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-machine microvm,acpi=on,pit=off,pic=off,rtc=on \
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-bios /path/to/MICROVM.fd \
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[ ... more args here ... ]
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