On Tue, Apr 06, 2021 at 10:06:09AM -0700, Patrick Venture wrote: > On Tue, Apr 6, 2021 at 9:54 AM Corey Minyard <cminy...@mvista.com> wrote: > > > > On Tue, Apr 06, 2021 at 09:04:35AM -0700, Patrick Venture wrote: > > > Corey; > > > > > > I saw you have a branch that is working on adding smbus IPMI support > > > (the ssif approach). > > > > > > Can you provide details on the status of this work? > > > > There is already an SMBus BMC device that can sit on the I2C bus. It's > > in mainstream qemu now. > > This device: > > github.com/qemu/qemu/blob/master/hw/ipmi/smbus_ipmi.c > > So this device gets added to the BMC's i2c, and it's just that there's > no host-side support to then master this device? in a multi-node > simulation.
This works two ways, there is an internal, simple BMC simulator, or it can make a connection to an external BMC. > > I'm asking because my team is currently working on implementing ssif > support (between two nodes). Ah, there is already a protocol that I developed for this that others are using already. At Google I think, among others. It's described in: https://sourceforge.net/p/openipmi/code/ci/master/tree/lanserv/README.vm The rest of that directory is a BMC simulator that can connect to qemu and manage a qemu session, starting, stopping, monitoring, etc. The idea was to use IPMI to manage qemu, and some people are using it for that. There is obviously already a bridge on the host side to handle taking the SSIF messages and transporting them over the wire to something else. I know people were working on the BMC side, but I don't know the status. -corey > > > > > It does not have smbus alert support, though. I have patches for that, > > but qemu doesn't have a flexibly general interrupt infrastructure, so I > > hacked something in, and it's likely to be contentious. The trouble is > > that the interrupt is disconnected from any real device, and qemu > > doesn't handle that very well. And like the other things, I really only > > created it for my testing. > > > > For doing what you are trying to do, I don't think you need any special > > support on either side for SSIF to work. > > > > -corey > > > > > > > > Patrick >
