Hi again, OK, I swapped those two lines in intel_iommu_attach_device [1], fixed another warning in the wbinvd emulation, but now I'm about to give up. This is freaky MMU stuff: general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC last sysfs file: /sys/devices/pci0000:00/0000:00:1a.0/device CPU 1 Modules linked in: kvm_intel kvm bluetooth snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device edd ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables ip6table_filter ip6_tables x_tables ipv6 fuse loop mac80211 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec ath9k_common ath9k_hw snd_hwdep snd_pcm snd_timer snd ath pcmcia cfg80211 sdhci_pci tpm_infineon sdhci yenta_socket firewire_ohci tpm_tis mmc_core soundcore e1000e sg pcmcia_rsrc tpm firewire_core iTCO_wdt video snd_page_alloc pcmcia_core i2c_i801 rfkill tpm_bios intel_agp output fujitsu_laptop iTCO_vendor_support i2c_core serio_raw pcspkr led_class joydev crc_itu_t button battery intel_gtt ac ext4 mbcache jbd2 crc16 sha256_generic aes_x86_64 aes_generic cbc dm_crypt linear sd_mod crc_t10dif dm_snapshot dm_mod fan processor ahci libahci ata_generi c liba ta scsi_mod thermal thermal_sys hwmon Nov 1 13:19:11 mchn199C kernel: Pid: 2248, comm: qemu-system-x86 Not tainted 2.6.36+ #12 FJNB211W/CELSIUS H700 RIP: 0010:[<ffffffff8121de8c>] [<ffffffff8121de8c>] pfn_to_dma_pte+0x73/0x190 RSP: 0018:ffff8800bd4bdb68 EFLAGS: 00010202 RAX: ffff1000bd4fe000 RBX: ffff1000bd4fec00 RCX: 0000000000000009 RDX: 0000000000000180 RSI: ffff88012a940938 RDI: 0000000000000202 RBP: ffff8800bd4bdba8 R08: ffffea00025ac2a0 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: ffff880128dfee00 R13: 0000000000000002 R14: 00000000000f0000 R15: 0000000000000009 FS: 00007f4990d33710(0000) GS:ffff8800be680000(0000) knlGS:0000000000000000 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000001408000 CR3: 00000000bd7db000 CR4: 00000000000026e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process qemu-system-x86 (pid: 2248, threadinfo ffff8800bd4bc000, task ffff88012a940000) Stack: ffff8800bd4bdb88 ffff8800ac378000 00000000000000d2 00000000000f0000 <0> ffff8800bd4bdce8 ffff8800ac2fc000 0000000000000003 00000000000f0001 <0> ffff8800bd4bdbb8 ffffffff8121dfbe ffff8800bd4bdbc8 ffffffff812a9573 Call Trace: [<ffffffff8121dfbe>] intel_iommu_iova_to_phys+0x15/0x2a [<ffffffff812a9573>] iommu_iova_to_phys+0x13/0x15 [<ffffffffa04e91d0>] kvm_iommu_map_pages+0x77/0x194 [kvm] [<ffffffff8111404d>] ? __vmalloc_node+0x86/0x9b [<ffffffffa04e30e2>] __kvm_set_memory_region+0x4e5/0x787 [kvm] [<ffffffff81081ee8>] ? mark_held_locks+0x50/0x72 [<ffffffff8137c983>] ? mutex_lock_nested+0x325/0x34d [<ffffffffa04e33bb>] kvm_set_memory_region+0x37/0x50 [kvm] [<ffffffffa04e4c15>] kvm_vm_ioctl_set_memory_region+0x18/0x1a [kvm] [<ffffffffa04e4e44>] kvm_vm_ioctl+0x22d/0x3b1 [kvm] [<ffffffff811355aa>] ? fget_light+0x17b/0x31f [<ffffffff81143bd7>] do_vfs_ioctl+0x4c6/0x507 [<ffffffff81135732>] ? fget_light+0x303/0x31f [<ffffffff811355aa>] ? fget_light+0x17b/0x31f [<ffffffff8137ebb9>] ? retint_swapgs+0x13/0x1b [<ffffffff81143c6e>] sys_ioctl+0x56/0x7c [<ffffffff81002df2>] system_call_fastpath+0x16/0x1b Code: c7 31 db 47 8d 3c ff e9 1d 01 00 00 0f 0b 4c 89 f2 44 88 f9 48 d3 ea 81 e2 ff 01 00 00 41 83 fd 01 48 8d 1c d0 0f 84 0b 01 00 00 <f6> 03 03 0f 85 d8 00 00 00 41 8b 44 24 04 85 c0 79 08 65 8b 04 RIP [<ffffffff8121de8c>] pfn_to_dma_pte+0x73/0x190 RSP <ffff8800bd4bdb68> Can anyone parse this? Is it Intel-specific or a generic issue? The kernel is current kvm.git + unrelated patch + [1]. Jan [1] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/61923
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