On 2014-09-30 12:39, Paolo Bonzini wrote:
> Il 30/09/2014 10:48, Jan Kiszka ha scritto:
>>>> + w('{')
>>>> + w('\treturn __kvm_mmu_notifier_clear_flush_young(mn, mm, hva, hva+1);')
>> Ah, end=start+1, it's that easy!
>>
>
> Yes, that's how kvm_handle_hva is implemented on top of
> kvm_handle_hva_range. So, now that kvm_age_hva calls
> kvm_handle_hva_range instead of kvm_handle_hva, you can apply the same
> technique to the call of kvm_age_hva.
[50757.107460] loaded kvm module (v3.17-rc1-168-gcec26bc)
[50764.182381] BUG: unable to handle kernel paging request at fffffffffffffffe
[50764.182402] IP: [<ffffffff81168449>] put_page+0x9/0x30
[50764.182414] PGD 1e15067 PUD 1e17067 PMD 0
[50764.182419] Oops: 0000 [#1] PREEMPT SMP
[50764.182424] Modules linked in: kvm_intel(O) kvm(O) cp210x mct_u232 pl2303 usbserial snd_usb_audio snd_usbmidi_lib snd_rawmidi xt_nat xt_pkttype xt_tcpudp xt_LOG xt_limit iptable_nat nf_nat_ipv4 nf_nat ctr ccm fuse bluetooth 6lowpan_iphc af_packet snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device edd ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw xt_CT ipt_REJECT iptable_raw iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables cpufreq_conservative cpufreq_userspace cpufreq_powersave loop arc4 ath9k mac80211 ath9k_common ath9k_hw nvidia(PO) ath snd_hda_codec_realtek vhost_net macvtap macvlan snd_hda_codec_generic snd_hda_codec_hdmi cfg80211 vhost snd_hda_intel o2scr(O) tun snd_hda_controller e1000e snd_hda_codec pcmcia drm snd_hwdep snd_pcm irda sdhci_pci gpio_ich yenta_socket mei_me sdhci snd_timer pcmcia_rsrc tpm_infineon iTCO_wdt snd!
mmc_core
mei sr_mod ptp ppdev rfkill cdrom iTCO_vendor_support pps_core parport_pc tpm_tis pcmcia_core lpc_ich i2c_i801 tpm sg parport serio_raw intel_ips soundcore pcspkr video joydev mfd_core fujitsu_laptop acpi_cpufreq battery button ac crc_ccitt dm_crypt linear md_mod scsi_dh_alua scsi_dh_emc scsi_dh_hp_sw scsi_dh_rdac scsi_dh dm_snapshot dm_bufio dm_mod sha256_ssse3 sha256_generic cbc fan processor ata_generic thermal [last unloaded: kvm]
[50764.182544] CPU: 1 PID: 22091 Comm: qemu-system-x86 Tainted: P O 3.15.5-1.g01d2774-desktop #2
[50764.182549] Hardware name: FUJITSU CELSIUS H700/FJNB211W, BIOS Version 1.20 01/24/2011
[50764.182554] task: ffff880045cac0d0 ti: ffff88022dd84000 task.ti: ffff88022dd84000
[50764.182558] RIP: 0010:[<ffffffff81168449>] [<ffffffff81168449>] put_page+0x9/0x30
[50764.182563] RSP: 0018:ffff88022dd87d68 EFLAGS: 00010246
[50764.182567] RAX: 6dbd249249249000 RBX: ffff88016d040040 RCX: 0000000000000000
[50764.182570] RDX: 0000000000002014 RSI: 6dbd249249249000 RDI: fffffffffffffffe
[50764.182574] RBP: ffff88022dd87d68 R08: 0000000000000001 R09: 0000000000000000
[50764.182578] R10: dead000000100100 R11: 0000000000000000 R12: ffff88004760c000
[50764.182582] R13: 0000000000000000 R14: 0000000000000000 R15: 00000000ffffffea
[50764.182586] FS: 00007f9133bff700(0000) GS:ffff88023bc80000(0000) knlGS:0000000000000000
[50764.182590] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[50764.182594] CR2: fffffffffffffffe CR3: 00000000418d0000 CR4: 00000000000027e0
[50764.182598] Stack:
[50764.182600] ffff88022dd87da8 ffffffffa12608bc 0000000000000000 0000000000000000
[50764.182605] ffff88022dd87d01 00000000fee00900 ffff88016d040040 ffff88016d040040
[50764.182610] ffff88022dd87dd8 ffffffffa12f503c ffff88004760c000 ffff880000000000
[50764.182615] Call Trace:
[50764.182633] [<ffffffffa12608bc>] vmx_vcpu_reset+0x20c/0x3b0 [kvm_intel]
[50764.182697] [<ffffffffa12f503c>] kvm_arch_vcpu_setup+0x2c/0x50 [kvm]
[50764.182734] [<ffffffffa12e24d4>] kvm_vm_ioctl_create_vcpu+0x84/0x1e0 [kvm]
[50764.182753] [<ffffffffa12e29ab>] kvm_vm_ioctl+0x37b/0x520 [kvm]
[50764.182770] [<ffffffff811e1685>] do_vfs_ioctl+0x75/0x2c0
[50764.182777] [<ffffffff811e1971>] SyS_ioctl+0xa1/0xb0
[50764.182785] [<ffffffff8167ef29>] system_call_fastpath+0x16/0x1b
[50764.182797] [<00007f917b868d87>] 0x7f917b868d86
[50764.182800] Code: 00 e8 9c fe ff ff 48 63 45 fc 65 48 01 04 25 70 fd 00 00 c9 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 66 66 66 66 90 <48> f7 07 00 c0 00 00 75 14 f0 ff 4f 1c 74 08 c9 c3 66 0f 1f 44
[50764.182828] RIP [<ffffffff81168449>] put_page+0x9/0x30
[50764.182834] RSP <ffff88022dd87d68>
[50764.182836] CR2: fffffffffffffffe
Your patch alone is not enough, I suppose. Let me look closer...
>
> Of course the bug that Andres fixed will remain.
Yes, that's clear.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
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