Re: IPMI Smbus
On Tue, Apr 06, 2021 at 10:06:09AM -0700, Patrick Venture wrote: > On Tue, Apr 6, 2021 at 9:54 AM Corey Minyard 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 >
Re: IPMI Smbus
On Tue, Apr 6, 2021 at 9:54 AM Corey Minyard 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. I'm asking because my team is currently working on implementing ssif support (between two nodes). > > 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
Re: IPMI Smbus
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. 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
IPMI Smbus
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? Patrick
[Qemu-devel] [PATCH 00/13] pm_smbus fixes and and IPMI SMBus device
The pm_smbus code has a few issues, and it's missing a lot of the device capabilities required by IPMI. This has been submitted before, but it has some new things, like vmstate handling for the smbus devices.
