Re: [sig-hypervisors] [RISC-V] [tech-unixplatformspec] SBI Debug Console Extension Proposal (Draft v1)
On Thu, Jun 02, 2022 at 01:50:01PM -0700, Greg Favor wrote:
On Thu, Jun 2, 2022 at 1:29 PM Stefano Stabellini <I think the extension was proposed to be a Debug console extension.
In a production environment if 10's of VMs were booting having them emit
to the physical console - where all of those outputs will get interspersed
seems to be not so useful. In a production environment would we expect the
VMM to provide a console service and not need SBI calls into M-mode firmare
to emit VM output to a physical console?
I was thinking this was about early boot debug and not so much about needing
a console at early boot. In most production deployments there may not be someone sitting at a terminal watching prints and so it may make more sense
for VM console outputs to be logged into a persistent file somewhere for example.
Or be held in the VM itself - e.g. a kernel ring buffer that someone may want
to display using a tool like dmesg when needed but otherwise does not get emitted chattily to a physical console.
Hope I am understanding this right.