On Tue, 4 Jun 2019 16:51:20 +0200 Cornelia Huck <cohuck@xxxxxxxxxx> wrote: > On Tue, 4 Jun 2019 15:22:56 +0200 > Halil Pasic <pasic@xxxxxxxxxxxxx> wrote: > > > On Mon, 3 Jun 2019 17:27:40 +0200 > > Cornelia Huck <cohuck@xxxxxxxxxx> wrote: > > > > Apologies if that already has been answered (and I missed it in my mail > > > pile...), but two things had come to my mind previously: > > > > > > - CHSC... does anything need to be done there? Last time I asked: > > > "Anyway, css_bus_init() uses some chscs > > > early (before cio_dma_pool_init), so we could not use the pools > > > there, even if we wanted to. Do chsc commands either work, or else > > > fail benignly on a protected virt guest?" > > > > Protected virt won't support all CHSC. The supported ones won't requre > > use of shared memory. So we are fine. > > I suppose the supported ones are the sync chscs that use the chsc area > as a direct parameter (and therefore are handled similarly to the other > I/O instructions that supply a direct parameter)? I don't think we care > about async chscs in KVM/QEMU anyway, as we don't even emulate chsc > subchannels :) (And IIRC, you don't get chsc subchannels in z/VM > guests, either.) Nod. > > > > > > - PCI indicators... does this interact with any dma configuration on > > > the pci device? (I know pci is not supported yet, and I don't really > > > expect any problems.) > > > > > > > It does but, I'm pretty confident we don't have a problem with PCI. IMHO > > Sebastian is the guy who needs to be paranoid about this, and he r-b-ed > > the respective patches. > > Just wanted to make sure that this was on the radar. You guys are > obviously in a better position than me to judge this :) > > Anyway, I do not intend to annoy with those questions, it's just hard > to get a feel if there are areas that still need care if you don't have > access to the documentation for this... if you tell me that you are > aware of it and it should work, that's fine for me. > The questions are important. It is just the not so unusual problem with the availability of public documentation that makes things a bit difficult for me as well. And sorry if these questions were ignored in the past. I did not have the bandwidth to take care of all the questions properly, but I did enough so that the other guys never knew if they need to engage or not. Regards, Halil
