Am Freitag, 4. Oktober 2024, 12:29:57 schrieb Jürgen Groß: > On 04.10.24 12:05, Niels Dettenbach wrote: > > > Virtual machines under Xen Hypervisor (DomU) running in Xen PV mode use > > a > > special, nonstandard synthetized CPU topology which "just works" under > > kernels 6.9.x while newer kernels wrongly assuming a "crash kernel" and > > disable SMP (reducing to one CPU core) because the newer topology > > implementation produces a wrong error "[Firmware Bug]: APIC enumeration > > order not specification compliant" after new topology checks which are > > improper for Xen PV platform. As a result, the kernel disables SMP and > > activates just one CPU core within the PV DomU "VM" (DomU in PV mode). > > > > The patch disables the regarding checks if it is running in Xen PV > > mode (only) and bring back SMP / all CPUs as in the past to such DomU > > VMs. The Xen subsystem takes care of the proper interaction between > > "guest" (DomU) and the "host" (Dom0). > > > > Signed-off-by: Niels Dettenbach <nd@xxxxxxxxxxxx> > > > Does the attached patch instead of yours help? > > Compile tested only. it does ß))) domU: -- snip -- vcpus=6 cpu="12,13,14,15,23,24" -- snap -- -- snip -- [ 0.500458] cpu 0 spinlock event irq 1 [ 0.500485] VPMU disabled by hypervisor. [ 0.501273] Performance Events: unsupported p6 CPU model 62 no PMU driver, software events only. [ 0.501304] signal: max sigframe size: 1776 [ 0.501410] rcu: Hierarchical SRCU implementation. [ 0.501428] rcu: Max phase no-delay instances is 400. [ 0.502032] NMI watchdog: Perf NMI watchdog permanently disabled [ 0.502309] smp: Bringing up secondary CPUs ... [ 0.502759] installing Xen timer for CPU 2 [ 0.503384] installing Xen timer for CPU 4 [ 0.503838] cpu 2 spinlock event irq 16 [ 0.503870] cpu 4 spinlock event irq 17 [ 0.504867] installing Xen timer for CPU 1 [ 0.505495] installing Xen timer for CPU 3 [ 0.506125] installing Xen timer for CPU 5 [ 0.506363] cpu 1 spinlock event irq 33 [ 0.507869] cpu 3 spinlock event irq 34 [ 0.507901] cpu 5 spinlock event irq 35 [ 0.507923] smp: Brought up 1 node, 6 CPUs -- snap -- thank you very much! niels.
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