Hi Daniel, Daniel P. Berrangé, Apr 18, 2024 at 18:42:
> > + if (kvm_is_rapl_feat_enable(cs)) { > > + if (!IS_INTEL_CPU(env)) { > > + error_setg(errp, "RAPL feature can only be\ > > + enabled with Intel CPU models"); > > + return false; > > + } > > + } > > I see a crash in kvm_is_rapl_feat_enable() from this caller, > when I run with this kind of command line: > > $ qemu-system-x86_64 \ > -kernel /lib/modules/6.6.9-100.fc38.x86_64/vmlinuz \ > -initrd tiny-initrd.img -m 2000 -serial stdio -nodefaults \ > -display none -accel kvm -append "console=ttyS0 quiet" > > > #0 0x0000555555bc14b7 in kvm_is_rapl_feat_enable > (cs=cs@entry=0x555557b83470) at ../target/i386/kvm/kvm.c:2531 > #1 0x0000555555bc7534 in kvm_cpu_realizefn (cs=0x555557b83470, > errp=0x7fffffffd2a0) at ../target/i386/kvm/kvm-cpu.c:54 > #2 0x0000555555d2432a in accel_cpu_common_realize (cpu=0x555557b83470, > errp=0x7fffffffd2a0) at ../accel/accel-target.c:130 > #3 0x0000555555cdd955 in cpu_exec_realizefn (cpu=cpu@entry=0x555557b83470, > errp=errp@entry=0x7fffffffd2a0) at ../cpu-target.c:137 > #4 0x0000555555c14b89 in x86_cpu_realizefn (dev=0x555557b83470, > errp=0x7fffffffd310) at ../target/i386/cpu.c:7320 > #5 0x0000555555d58f4b in device_set_realized (obj=<optimized out>, > value=<optimized out>, errp=0x7fffffffd390) at ../hw/core/qdev.c:510 > #6 0x0000555555d5d78d in property_set_bool (obj=0x555557b83470, v=<optimized > out>, name=<optimized out>, opaque=0x5555578558e0, errp=0x7fffffffd390) > at ../qom/object.c:2358 > #7 0x0000555555d60b0b in object_property_set (obj=obj@entry=0x555557b83470, > name=name@entry=0x55555607c799 "realized", v=v@entry=0x555557b8ccb0, > errp=0x7fffffffd390, > errp@entry=0x555556e210d8 <error_fatal>) at ../qom/object.c:1472 > #8 0x0000555555d6444f in object_property_set_qobject > (obj=obj@entry=0x555557b83470, name=name@entry=0x55555607c799 "realized", > value=value@entry=0x555557854800, errp=errp@entry=0x555556e210d8 > <error_fatal>) > at ../qom/qom-qobject.c:28 > #9 0x0000555555d61174 in object_property_set_bool > (obj=0x555557b83470, name=name@entry=0x55555607c799 "realized", > value=value@entry=true, errp=errp@entry=0x555556e210d8 <error_fatal>) at > ../qom/object.c:1541 > #10 0x0000555555d59a3c in qdev_realize (dev=<optimized out>, > bus=bus@entry=0x0, errp=errp@entry=0x555556e210d8 <error_fatal>) at > ../hw/core/qdev.c:292 > #11 0x0000555555bd51e0 in x86_cpu_new (x86ms=<optimized out>, apic_id=0, > errp=0x555556e210d8 <error_fatal>) at ../hw/i386/x86.c:105 > #12 0x0000555555bd52ce in x86_cpus_init (x86ms=x86ms@entry=0x555557aaed30, > default_cpu_version=<optimized out>) at ../hw/i386/x86.c:156 > #13 0x0000555555bdc1a7 in pc_init1 (machine=0x555557aaed30, > pci_type=0x55555604aa61 "i440FX") at ../hw/i386/pc_piix.c:185 > #14 0x0000555555947a11 in machine_run_board_init (machine=0x555557aaed30, > mem_path=<optimized out>, errp=<optimized out>, errp@entry=0x555556e210d8 > <error_fatal>) > at ../hw/core/machine.c:1547 > #15 0x0000555555b020ed in qemu_init_board () at ../system/vl.c:2613 > #16 qmp_x_exit_preconfig (errp=0x555556e210d8 <error_fatal>) at > ../system/vl.c:2705 > #17 0x0000555555b0611e in qemu_init (argc=<optimized out>, argv=<optimized > out>) at ../system/vl.c:3739 > #18 0x0000555555897ca9 in main (argc=<optimized out>, argv=<optimized out>) > at ../system/main.c:47 > > The problem is that 'cs->kvm_state' is NULL here > After some investigation it seems that kvm_state is not yet committed at this point. Shame, because GDB showed me that we have already pass the kvm_accel_instance_init() in accel/kvm/kvm-all.c that sets the value "msr_energy.enable" in kvm_state... So should I dig more to still do the sanity check in kvm_cpu_realizefn() or should I already move the RAPL feature from -kvm to -cpu like suggested by Zhao from Intel and then access it from the CPUState ? The last one would require more work but if I can skip a new iteration because I would need to do it anyway that would save me time in this end. Thanks Regards, Anthony