On 08/03/2023 3:23 pm, Elliott Mitchell wrote: > Mostly SSIA. As originally identified by "Neowutran", appears Xen's > x2apic wrapper implementation fails with current generation AMD hardware > (Ryzen 7xxx/Zen 4). This can be worked around by passing "x2apic=false" > on Xen's command-line, though I'm wondering about the performance impact. > > There hasn't been much activity on xen-devel WRT x2apic, so a patch which > fixed this may have flown under the radar. Most testing has also been > somewhat removed from HEAD. > > Thanks to "Neowutran" for falling on this grenade and making it easier > for the followers. Pointer to first report: > https://forum.qubes-os.org/t/ryzen-7000-serie/14538
I'm sorry, but this is unactionable. That thread is a mess of many different bugs, most entirely unrelated to Xen in the slightest, and there is conflicting information on whether the x2apic=false heuristic is even relevant. There may be a Xen issue hiding in there, but my divination skill level is unequal to the task... ~Andrew
