RE: [PATCH v9 00/18] Add VT-d Posted-Interrupts support - including prerequisite series
From: Wu, Feng
Date: Mon Sep 28 2015 - 06:23:17 EST
> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@xxxxxxxxxx]
> Sent: Monday, September 28, 2015 6:19 PM
> To: Wu, Feng; alex.williamson@xxxxxxxxxx; joro@xxxxxxxxxx;
> mtosatti@xxxxxxxxxx
> Cc: eric.auger@xxxxxxxxxx; kvm@xxxxxxxxxxxxxxx;
> iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH v9 00/18] Add VT-d Posted-Interrupts support - including
> prerequisite series
>
>
>
> On 28/09/2015 12:14, Wu, Feng wrote:
> > Thanks a lot for creating branch for vt-d pi. However, I cannot launch guests
> > with this tree. I encountered the following kernel dump, and I find that the
> > problematic commit is " 2260b1cde0b5472ab70ad0764b10095372e41913 "
> >
> > KVM: x86: put vcpu_create under kvm->srcu critical section
> >
> > This is needed in case vcpu_create wants to access the memslots array.
> > Fixes this lockdep splat:
> >
> > After removing this commit from the tree, my VT-d patch-set works fine.
>
> Great, thanks. The above commit had already been reverted.
>
> I'm sorting out the kbuild reports, and then will merge VT-d PI.
Thanks a lot for make this happen!
Thanks,
Feng
>
> Paolo
>
> >
> > Kernel dump:
> > [ 221.978182] BUG: unable to handle kernel NULL pointer dereference at
> (null)
> > [ 221.986085] IP: [<ffffffffc0368ab0>] kvm_arch_vcpu_create+0x30/0x90
> [kvm]
> > [ 221.993102] PGD 0
> > [ 221.995148] Oops: 0000 [#1] SMP
> > [ 221.998440] Modules linked in: bnep rfcomm bluetooth ax88179_178a
> usbnet intel_rapl mii snd_hda_codec_hdmi iosf_mbi x86_pkg_temp_thermal
> nouveau intel_powerclamp snd_hda_intel snd_hda_codec coretemp kvm_intel
> snd_hda_core kvm snd_hwdep snd_pcm crct10dif_pclmul crc32_pclmul
> snd_seq_midi ghash_clmulni_intel mxm_wmi snd_seq_midi_event snd_rawmidi
> video snd_seq ttm aesni_intel aes_x86_64 lrw gf128mul drm_kms_helper
> snd_seq_device binfmt_misc snd_timer glue_helper ablk_helper drm cryptd
> fb_sys_fops snd syscopyarea sysfillrect sb_edac soundcore sysimgblt mei_me
> parport_pc edac_core ppdev mei shpchp lp lpc_ich mac_hid parport
> acpi_power_meter wmi ixgbe igb i2c_algo_bit hid_generic usbhid ptp ahci hid
> libahci pps_core mdio
> > [ 222.063533] CPU: 4 PID: 3384 Comm: qemu-system-x86 Not tainted
> 4.3.0-rc1+ #6
> > [ 222.070612] Hardware name: Intel Corp. GRANGEVILLE/GRANTLEY, BIOS
> GNVDCRB1.86B.0020.V07.1409241147 09/24/2014
> > [ 222.080764] task: ffff88006e7c8000 ti: ffff8800714a8000 task.ti:
> ffff8800714a8000
> > [ 222.088283] RIP: 0010:[<ffffffffc0368ab0>] [<ffffffffc0368ab0>]
> kvm_arch_vcpu_create+0x30/0x90 [kvm]
> > [ 222.097680] RSP: 0018:ffff8800714abde0 EFLAGS: 00010246
> > [ 222.103153] RAX: 0000000000000000 RBX: ffff88016f28c000 RCX:
> 0000000000000000
> > [ 222.110407] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
> ffff88016f28c000
> > [ 222.117659] RBP: ffff8800714abdf8 R08: 0000000000000001 R09:
> 0000000000000040
> > [ 222.124824] R10: ffff880077e86438 R11: ffff880163e06880 R12:
> ffff88016f28c000
> > [ 222.132150] R13: 0000000000000000 R14: 000000000000ae41 R15:
> 0000000000000000
> > [ 222.139405] FS: 00007f43fd7ec700(0000) GS:ffff880178700000(0000)
> knlGS:0000000000000000
> > [ 222.147629] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 222.153471] CR2: 0000000000000000 CR3: 000000017074b000 CR4:
> 00000000003426e0
> > [ 222.160726] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> > [ 222.167979] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> > [ 222.175231] Stack:
> > [ 222.177277] 0000000000000000 ffff88016f28c000 0000000000000000
> ffff8800714abea0
> > [ 222.184870] ffffffffc0355b17 0000000000000008 ffff8800714abe28
> ffffffff810aba32
> > [ 222.192444] ffff880178816e40 ffff8800714abe40 ffffffff810a4f44
> ffff880178816e40
> > [ 222.200017] Call Trace:
> > [ 222.202522] [<ffffffffc0355b17>] kvm_vm_ioctl+0x277/0x6e0 [kvm]
> > [ 222.208633] [<ffffffff810aba32>] ? put_prev_task_fair+0x22/0x40
> > [ 222.214741] [<ffffffff810a4f44>] ? pick_next_task_idle+0x14/0x30
> > [ 222.220942] [<ffffffff811fb53a>] do_vfs_ioctl+0x2ba/0x490
> > [ 222.226523] [<ffffffff8106274a>] ? __do_page_fault+0x1ba/0x410
> > [ 222.232546] [<ffffffff811fb789>] SyS_ioctl+0x79/0x90
> > [ 222.237684] [<ffffffff81003ba5>] ? syscall_return_slowpath+0x55/0x150
> > [ 222.244323] [<ffffffff81791d36>]
> entry_SYSCALL_64_fastpath+0x16/0x75
> > [ 222.250869] Code: 55 48 89 e5 41 55 41 54 53 41 89 f5 48 89 fb e8 27 61
> cb c0 85 c0 74 13 8b 83 f0 09 00 00 85 c0 74 09 80 3d 53 2e 04 00 00 74 40 <48>
> 8b 04 25 00 00 00 00 48 8d 78 48 e8 7f c4 d6 c0 41 89 c4 48
> > [ 222.270790] RIP [<ffffffffc0368ab0>] kvm_arch_vcpu_create+0x30/0x90
> [kvm]
> > [ 222.277813] RSP <ffff8800714abde0>
> > [ 222.281359] CR2: 0000000000000000
> > [ 222.290421] ---[ end trace 957f5a39692fe6c7 ]---
> > root@feng-bdw-de-pi:~/workspace/tools# dmesg > ~/dmesg.log
> > root@feng-bdw-de-pi:~/workspace/tools# vim ~/dmesg.log
> > [ 221.998440] Modules linked in: bnep rfcomm bluetooth ax88179_178a
> usbnet intel_rapl mii snd_hda_codec_hdmi iosf_mbi x86_pkg_temp_thermal
> nouveau intel_powerclamp snd_hda_intel snd_hda_codec coretemp kvm_intel
> snd_hda_core kvm snd_hwdep snd_pcm crct10dif_pclmul crc32_pclmul
> snd_seq_midi ghash_clmulni_intel mxm_wmi snd_seq_midi_event snd_rawmidi
> video snd_seq ttm aesni_intel aes_x86_64 lrw gf128mul drm_kms_helper
> snd_seq_device binfmt_misc snd_timer glue_helper ablk_helper drm cryptd
> fb_sys_fops snd syscopyarea sysfillrect sb_edac soundcore sysimgblt mei_me
> parport_pc edac_core ppdev mei shpchp lp lpc_ich mac_hid parport
> acpi_power_meter wmi ixgbe igb i2c_algo_bit hid_generic usbhid ptp ahci hid
> libahci pps_core mdio
> > [ 222.063533] CPU: 4 PID: 3384 Comm: qemu-system-x86 Not tainted
> 4.3.0-rc1+ #6
> > [ 222.070612] Hardware name: Intel Corp. GRANGEVILLE/GRANTLEY, BIOS
> GNVDCRB1.86B.0020.V07.1409241147 09/24/2014
> > [ 222.080764] task: ffff88006e7c8000 ti: ffff8800714a8000 task.ti:
> ffff8800714a8000
> > [ 222.088283] RIP: 0010:[<ffffffffc0368ab0>] [<ffffffffc0368ab0>]
> kvm_arch_vcpu_create+0x30/0x90 [kvm]
> > [ 222.097680] RSP: 0018:ffff8800714abde0 EFLAGS: 00010246
> > [ 222.103153] RAX: 0000000000000000 RBX: ffff88016f28c000 RCX:
> 0000000000000000
> > [ 222.110407] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
> ffff88016f28c000
> > [ 222.117659] RBP: ffff8800714abdf8 R08: 0000000000000001 R09:
> 0000000000000040
> > [ 222.124824] R10: ffff880077e86438 R11: ffff880163e06880 R12:
> ffff88016f28c000
> > [ 222.132150] R13: 0000000000000000 R14: 000000000000ae41 R15:
> 0000000000000000
> > [ 222.139405] FS: 00007f43fd7ec700(0000) GS:ffff880178700000(0000)
> knlGS:0000000000000000
> > [ 222.147629] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 222.153471] CR2: 0000000000000000 CR3: 000000017074b000 CR4:
> 00000000003426e0
> > [ 222.160726] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> > [ 222.167979] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> > [ 222.175231] Stack:
> > [ 222.177277] 0000000000000000 ffff88016f28c000 0000000000000000
> ffff8800714abea0
> > [ 222.184870] ffffffffc0355b17 0000000000000008 ffff8800714abe28
> ffffffff810aba32
> > [ 222.192444] ffff880178816e40 ffff8800714abe40 ffffffff810a4f44
> ffff880178816e40
> > [ 222.200017] Call Trace:
> > [ 222.202522] [<ffffffffc0355b17>] kvm_vm_ioctl+0x277/0x6e0 [kvm]
> > [ 222.208633] [<ffffffff810aba32>] ? put_prev_task_fair+0x22/0x40
> > [ 222.214741] [<ffffffff810a4f44>] ? pick_next_task_idle+0x14/0x30
> > [ 222.220942] [<ffffffff811fb53a>] do_vfs_ioctl+0x2ba/0x490
> > [ 222.226523] [<ffffffff8106274a>] ? __do_page_fault+0x1ba/0x410
> > [ 222.232546] [<ffffffff811fb789>] SyS_ioctl+0x79/0x90
> > [ 222.237684] [<ffffffff81003ba5>] ? syscall_return_slowpath+0x55/0x150
> > [ 222.244323] [<ffffffff81791d36>]
> entry_SYSCALL_64_fastpath+0x16/0x75
> > [ 222.250869] Code: 55 48 89 e5 41 55 41 54 53 41 89 f5 48 89 fb e8 27 61
> cb c0 85 c0 74 13 8b 83 f0 09 00 00 85 c0 74 09 80 3d 53 2e 04 00 00 74 40 <48>
> 8b 04 25 00 00 00 00 48 8d 78 48 e8 7f c4 d6 c0 41 89 c4 48
> > [ 222.270790] RIP [<ffffffffc0368ab0>] kvm_arch_vcpu_create+0x30/0x90
> [kvm]
> > [ 222.277813] RSP <ffff8800714abde0>
> > [ 222.281359] CR2: 0000000000000000
> > [ 222.290421] ---[ end trace 957f5a39692fe6c7 ]---
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