Do we have any surely working scenario of pci-bridge's SHPC usage? Because first of all I've tried to use SHPC to avoi involving any ACPI code, but it didn't look functioning even for ordinary pci-bridge, that's why after talking to Marcel I left SHPC idea.
2017-07-03 16:58 GMT+03:00 Alexander Bezzubikov <zuban...@gmail.com>: > Hmm, I've failed to make SHPC (from current master) work on any modern > Linux guests. > > 2017-07-03 15:27 GMT+03:00 Igor Mammedov <imamm...@redhat.com>: > >> On Fri, 30 Jun 2017 10:25:05 +0300 >> Marcel Apfelbaum <mar...@redhat.com> wrote: >> >> [...] >> > >> > So for the modern systems not supporting PCI ACPI hotplug >> > we don't need pci-bridges anyway, but for the older ones >> > the ACPI code of the pci-bridge will be loaded into the >> > ACPI namespace only if a pci-bridge is actually hot-plugged. >> >> just note that the set of 'older' guest OSes is limited to >> one that do not support SHPC (i.e. to EOLed WinXP & co) >> as for linux and more modern Windows SHPC hotplug should >> just work without our ACPI hack (which taxes low memory >> to keep acpi tables for bridges). >> >> So I'm in favor of Michael's suggestion to leave ACPI PCI >> only in PC machine for old WinXP guests and to keep Q35 >> clean, where linux or newer Windows guests could just >> use standard SHPC. >> >> [...] >> > > > > -- > Alexander Bezzubikov > -- Alexander Bezzubikov
