On Sun, 2019-08-11 at 09:20 +0200, Thomas Gleixner wrote: > On Wed, 7 Aug 2019, Marc Zyngier wrote: > > > > On 07/08/2019 14:56, Thomas Gleixner wrote: > > > > > > On Tue, 6 Aug 2019, Megha Dey wrote: > > > > > > > > On Sat, 2019-06-29 at 09:59 +0200, Thomas Gleixner wrote: > > > > > > > > > > On Fri, 21 Jun 2019, Megha Dey wrote: > > > > Totally agreed. The request to add a dynamic MSI-X > > > > infrastructure came > > > > from some driver teams internally and currently they do not > > > > have > > > > bandwidth to come up with relevant test cases. <sigh> > > > Hahahaha. > > > > > > > > > > > But we hope that this patch set could serve as a precursor to > > > > the > > > > interrupt message store (IMS) patch set, and we can use this > > > > patch set > > > > as the baseline for the IMS patches. > > > If IMS needs the same functionality, then we need to think about > > > it > > > slightly differently because IMS is not necessarily tied to PCI. > > > > > > IMS has some similarity to the ARM GIC ITS stuff IIRC, which > > > already > > > provides these things outside of PCI. Marc? > > Indeed. We have MSI-like functionality almost everywhere, and make > > heavy > > use of the generic MSI framework. Platform-MSI is probably the most > > generic example we have (it's the Far West transposed to MSIs). > > > > > > > > We probably need some generic infrastructure for this so PCI and > > > everything > > > else can use it. > > Indeed. Overall, I'd like the concept of MSI on whatever bus to > > have one > > single behaviour across the board, as long as it makes sense for > > that > > bus (nobody needs another PCI MultiMSI, for example). > Right. > > @Intel: Is there documentation and perhaps early code for that IMS > muck to > look at? Hi Thomas, We have some early documentation on IMS which can be found here (part of the Scalable I/O Virtualization spec): https://software.intel.com/sites/default/files/managed/cc/0e/intel-scal able-io-virtualization-technical-specification.pdf (Section 3.4.1) Also, I do have some initial IMS patches that we use internally for testing. I will clean it up and send it as an RFC patchset shortly. > > Thanks, > > tglx
