Hello, This provided dmesg message and kernel behavior appear when trying to run qemu-kvm with kvm_amd module. Without kvm_amd qemu-kvm runs fine but a slower. I managed to see that this happens with 2.6.38-rc6 , 2.6.38-rc7 vanilla kernels compiled using kernel-package. OS ubuntu natty. Using the standard toolchain and gcc from ubuntu: gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-3ubuntu3) I reverted to 2.6.37.2 linux kernel, compiled with the very same tools and machine I use qemu-kvm with kvm_amd module without any problems. If I can provide some extra info about that please let me know. This issue also appears with the kernel provided by the Ubuntu distribution: 2.6.38-5-generic-pae #32-Ubuntu SMP Tue Feb 22 17:48:56 UTC 2011 i686 athlon i386 GNU/Linux , I suspect it is somehow related to the 2.6.38 kernel series. cpuinfo - phenom ii x4 955 mildly overclocked - 4 fields like this is the whole cpuinfo. cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 4 model name : AMD Phenom(tm) II X4 955 Processor stepping : 3 cpu MHz : 3680.416 cache size : 512 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt npt lbrv svm_lock nrip_save bogomips : 7360.83 clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate This is what dmesg shows: 101.358689] BUG: unable to handle kernel NULL pointer dereference at 00000014 [ 101.358785] IP: [<f89d4ad2>] x86_decode_insn+0x12/0x9b0 [kvm] [ 101.358868] *pdpt = 0000000032008001 *pde = 0000000000000000 [ 101.359005] Oops: 0000 [#1] SMP [ 101.359081] last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map [ 101.359178] Modules linked in: kvm_amd kvm binfmt_misc snd_hda_codec_via snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event radeon ttm snd_seq snd_timer snd_seq_device asus_atk0110 drm_kms_helper sp5100_tco drm snd i2c_algo_bit joydev soundcore snd_page_alloc i2c_piix4 k10temp lp shpchp parport usbhid hid ahci pata_atiixp libahci r8169 [ 101.359766] [ 101.359786] Pid: 1109, comm: qemu-system-x86 Not tainted 2.6.38-5-generic-pae #32-Ubuntu System manufacturer System Product Name/M4A88T-M [ 101.359974] EIP: 0060:[<f89d4ad2>] EFLAGS: 00210292 CPU: 2 [ 101.360084] EIP is at x86_decode_insn+0x12/0x9b0 [kvm] [ 101.360166] EAX: eec79454 EBX: eec79454 ECX: 00000000 EDX: 00000000 [ 101.360240] ESI: f89e76e0 EDI: 00000000 EBP: edca3de0 ESP: edca3d8c [ 101.360316] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 101.360395] Process qemu-system-x86 (pid: 1109, ti=edca2000 task=f2121940 task.ti=edca2000) [ 101.360499] Stack: [ 101.360536] edca3dd0 edca3dcc edca3dc0 f89b6969 000f0000 00000000 0000ffff 010bf000 [ 101.360671] 00010000 00000000 f8657020 eec78000 00000000 edca3de0 f89bf5a5 eec79484 [ 101.360804] 00000000 00000000 eec78000 eec79454 00000000 edca3e00 f89bfa22 f8657020 [ 101.360934] Call Trace: [ 101.360973] [<f89b6969>] ? kvm_get_cs_db_l_bits+0x29/0x50 [kvm] [ 101.361063] [<f89bf5a5>] ? init_emulate_ctxt+0x45/0x130 [kvm] [ 101.361152] [<f89bfa22>] x86_emulate_instruction+0x162/0x450 [kvm] [ 101.361229] [<f864df53>] emulate_on_interception+0x23/0x30 [kvm_amd] [ 101.361318] [<f8650c9f>] cr_interception+0x7f/0x210 [kvm_amd] [ 101.361392] [<f865313f>] handle_exit+0x15f/0x405 [kvm_amd] [ 101.361458] [<c10eb6d2>] ? unlock_page+0x42/0x50 [ 101.361513] [<c1107bd8>] ? __do_fault+0x418/0x520 [ 101.361575] [<f89be5fd>] ? kvm_get_cr8+0x2d/0x30 [kvm] [ 101.361636] [<f864e296>] ? svm_vcpu_run+0x1b6/0x370 [kvm_amd] [ 101.361709] [<f89c4692>] vcpu_enter_guest+0x1a2/0x440 [kvm] [ 101.361780] [<f89c4ebf>] __vcpu_run+0x12f/0x280 [kvm] [ 101.361842] [<c106992a>] ? sigprocmask+0x7a/0x100 [ 101.361904] [<f89c50d1>] kvm_arch_vcpu_ioctl_run+0xc1/0x1b0 [kvm] [ 101.361980] [<f89b0fea>] kvm_vcpu_ioctl+0x49a/0x5f0 [kvm] [ 101.362046] [<c1287494>] ? _copy_from_user+0x44/0x70 [ 101.362104] [<c106bfb2>] ? sys_rt_sigtimedwait+0x102/0x210 [ 101.362170] [<c107595c>] ? common_timer_set+0xfc/0x160 [ 101.362232] [<c153151f>] ? _raw_spin_lock_irqsave+0x2f/0x50 [ 101.362302] [<f89b0b50>] ? kvm_vcpu_ioctl+0x0/0x5f0 [kvm] [ 101.362367] [<c1141deb>] do_vfs_ioctl+0x7b/0x2e0 [ 101.362421] [<c1287502>] ? copy_to_user+0x42/0x60 [ 101.362477] [<c11420d7>] sys_ioctl+0x87/0x90 [ 101.362528] [<c100ab9f>] sysenter_do_call+0x12/0x28 [ 101.362587] Code: 30 89 c2 e9 63 ff ff ff 90 8b 4d e0 89 f2 ff 51 30 89 c2 eb c1 8d 74 26 00 55 89 e5 57 56 53 83 ec 48 3e 8d 74 26 00 89 c3 8b 33 <65> a1 14 00 00 00 89 45 f0 31 c0 8d 45 d0 89 45 c8 31 c0 89 75 [ 101.362628] EIP: [<f89d4ad2>] x86_decode_insn+0x12/0x9b0 [kvm] SS:ESP 0068:edca3d8c [ 101.362628] CR2: 0000000000000014 [ 101.394484] ---[ end trace 4bab68acb7870e5d ]--- [ 119.293605] usb 4-2: USB disconnect, address 2 [ 120.084016] usb 4-2: new low speed USB device using ohci_hcd and address 3 [ 120.259034] input: SIGMACH1P U+P Mouse as /devices/pci0000:00/0000:00:12.1/usb4/4-2/4-2:1.0/input/input5 [ 120.259103] generic-usb 0003:1C4F:0003.0003: input,hidraw1: USB HID v1.10 Mouse [SIGMACH1P U+P Mouse] on usb-0000:00:12.1-2/input0 Best Regards, Ivan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
