Hi Alexey, thanks for the ping. I think this is a good feature to have and I would like to check it in when it is ready. I spoke with Anthony and agreed that he will be reviewing it. Please be patient but we'll get there :-)
On Sat, 17 Mar 2018, Alexey G wrote: > A gentle RFC-ping. > > Any thoughts on this? Regarding the feature as a whole. So far there > were responses mostly targeting individual patches, while I'd like to > hear about chosen approaches in general, whether the overall direction > is correct (or not), etc. It's just RFC after all, not v11. :) > > I can split it into two series if that would be preferable, one for > general Q35 bring up and basic access to PCIe extended config > space via ECAM (this is what the feature was used for initially) and > the second part is providing support for PCIe Extended Capabilities > emulation infrastructure (hw/xen/xen-pt*.c in QEMU). > > On Tue, 13 Mar 2018 04:33:45 +1000 > Alexey Gerasimenko <x19...@gmail.com> wrote: > > >This patch series introduces support of Q35 emulation for Xen HVM > >guests (via QEMU). This feature is present in other virtualization > >products and Xen can greatly benefit from this feature as well. > > > >The main goal for implementing Q35 emulation for Xen was extending > >PCI/GPU passthrough capabilities. It's the main advantage of Q35 > >emulation > >- availability of extra features for PCIe device passthrough. The most > >important PCIe-specific passthrough feature Q35 provides is a support > >for PCIe config space ECAM (aka MMCONFIG) to allow accesses to > >extended PCIe config space (>256), which is MMIO-based. Lots of PCIe > >devices and their drivers make use of PCIe Extended Capabilities, > >whose can be accessed only using ECAM and offsets above 0x100 in PCI > >config space. Supporting ECAM is a mandatory feature for PCIe > >passthrough. Not only this allows passthrough PCIe devices to function > >properly, but opens a road to extend Xen PCIe passthrough features > >further -- eg. providing support for AER. One of possible directions > >is providing support for PCIe Resizable BARs -- a feature which likely > _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
