Philippe Mathieu-Daudé <phi...@redhat.com> writes: > Hi Sergio, > > On 10/16/19 12:12 PM, Sergio Lopez wrote: >> +Supported devices >> +----------------- >> + >> +The microvm machine type supports the following devices: >> + >> +- ISA bus >> +- i8259 PIC (optional) >> +- i8254 PIT (optional) >> +- MC146818 RTC (optional) >> +- One ISA serial port (optional) >> +- LAPIC >> +- IOAPIC (with kernel-irqchip=split by default) >> +- kvmclock (if using KVM) >> +- fw_cfg >> +- Up to eight virtio-mmio devices (configured by the user) > > If we have VirtIO devices, why not use virtio-serial instead of the > one on the ISA bus?
The serial port on the ISA bus is simpler, and thus is supported for both SeaBIOS debugging and Linux's earlyprintk. This makes it *very* convenient for debugging boot issues. Also, as it's explained in the documentation, users that no longer need it can disable the device and just rely on virtio-console. Sergio.
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