Hi Wenli, Could you please provide more details regarding the following:
> \[ 84.703574\] vp-vdpa 0000:01:00.0: Failed to register to vdpa bus > > kernel answers: File exists > > # vdpa dev del vdpa0 I suspect the device wasn't created successfully. Could it be that a vdpa0 already existed before you tried to create one? Thanks, Cindy On Tue, Jul 15, 2025 at 9:19 AM Jason Wang <jasow...@redhat.com> wrote: > > Adding Cindy for help here. > > On Mon, Jul 14, 2025 at 9:18 PM Wenli Quan <wq...@redhat.com> wrote: > > > > Hello all: > > > > I am encountering an issue when creating a vp_vdpa device with feature > > provisioning enabled. > > > > In the vm: > > > > # uname -r > > 6.16.0-rc2+ > > > > # cd /sys/bus/pci/drivers/virtio-pci/ > > > > # echo 0000:01:00.0 > unbind > > > > # modprobe vp_vdpa > > > > # cd ../vp-vdpa/ > > > > # echo "1af4 1041" > new_id > > > > # vdpa dev add name vdpa0 mgmtdev pci/0000:01:00.0 device_features 0x1 > > > > # vdpa dev add name vdpa0 mgmtdev pci/0000:01:00.0 device_features 0x1 > > > > [ 84.703574] vp-vdpa 0000:01:00.0: Failed to register to vdpa bus > > > > kernel answers: File exists > > > > # vdpa dev del vdpa0 > > > > > > [ 194.055148] BUG: kernel NULL pointer dereference, address: > > 00000000000000d0 > > > > [ 194.055698] #PF: supervisor read access in kernel mode > > > > [ 194.056100] #PF: error_code(0x0000) - not-present page > > > > [ 194.056497] PGD 7c7e067 P4D 0 > > > > [ 194.056739] Oops: Oops: 0000 [#1] SMP > > > > [ 194.057040] CPU: 0 UID: 0 PID: 13582 Comm: vdpa Not tainted 6.16.0-rc2+ > > #6 PREEMPT(voluntary) > > > > [ 194.057697] Hardware name: Red Hat KVM/RHEL, BIOS > > edk2-20241117-2.el9_6.1 11/17/2024 > > > > [ 194.058299] RIP: 0010:device_del+0x40/0x480 > > > > [ 194.058623] Code: 00 00 55 48 89 fd 53 48 83 ec 20 4c 8b 7f 40 4c 89 e7 > > 65 48 8b 05 10 bf 73 01 48 89 44 24 18 31 c0 e8 b4 2f 63 00 48 8b 55 48 > > <0f> b6 82 d0 00 00 00 a8 01 75 09 83 c8 01 88 82 d0 00 00 00 4c 89 > > > > [ 194.060031] RSP: 0018:ffa00000004dba90 EFLAGS: 00010246 > > > > [ 194.060436] RAX: 0000000000000000 RBX: ff110000089f1720 RCX: > > ffffffffa05f2200 > > > > [ 194.060976] RDX: 0000000000000000 RSI: ff11000018296800 RDI: > > ff11000018297080 > > > > [ 194.061510] RBP: ff11000018297000 R08: ff1100000a3ea048 R09: > > ffa00000004dbc50 > > > > [ 194.062051] R10: ff11000006abae00 R11: 0000000000000026 R12: > > ff11000018297080 > > > > [ 194.062586] R13: ff1100000571c300 R14: ffa00000004dbc50 R15: > > 0000000000000000 > > > > [ 194.063132] FS: 00007f03a6a95740(0000) GS:ff110000d8597000(0000) > > knlGS:0000000000000000 > > > > [ 194.063748] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > > [ 194.064189] CR2: 00000000000000d0 CR3: 0000000007830004 CR4: > > 0000000000773ef0 > > > > [ 194.064722] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > 0000000000000000 > > > > [ 194.065258] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: > > 0000000000000400 > > > > [ 194.065813] PKRU: 55555554 > > > > [ 194.066022] Call Trace: > > > > [ 194.066240] <TASK> > > > > [ 194.066418] device_unregister+0x12/0x30 > > > > [ 194.066724] vp_vdpa_dev_del+0x16/0x20 [vp_vdpa] > > > > [ 194.067078] vdpa_nl_cmd_dev_del_set_doit+0x67/0xe0 [vdpa] > > > > [ 194.067497] genl_family_rcv_msg_doit+0xd2/0x120 > > > > [ 194.067863] genl_rcv_msg+0x182/0x2b0 > > > > [ 194.068160] ? vdpa_nl_cmd_dev_get_dumpit+0xa0/0xa0 [vdpa] > > > > [ 194.068594] ? genl_family_rcv_msg_dumpit+0xf0/0xf0 > > > > [ 194.068971] netlink_rcv_skb+0x57/0x100 > > > > [ 194.069270] genl_rcv+0x28/0x40 > > > > [ 194.069515] netlink_unicast+0x278/0x3a0 > > > > [ 194.069828] netlink_sendmsg+0x1e7/0x420 > > > > [ 194.070134] __sock_sendmsg+0x38/0x60 > > > > [ 194.070414] ? move_addr_to_kernel.part.0+0x1b/0x60 > > > > [ 194.070794] __sys_sendto+0x115/0x170 > > > > [ 194.071086] ? __sys_recvmsg+0x6a/0xc0 > > > > [ 194.071378] __x64_sys_sendto+0x24/0x30 > > > > [ 194.071674] do_syscall_64+0x59/0x1f0 > > > > [ 194.071963] entry_SYSCALL_64_after_hwframe+0x4b/0x53 > > > > [ 194.072347] RIP: 0033:0x7f03a6ba7dea > > > > [ 194.072625] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f > > 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 > > <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89 > > > > [ 194.074021] RSP: 002b:00007ffceb0ebeb8 EFLAGS: 00000246 ORIG_RAX: > > 000000000000002c > > > > [ 194.074610] RAX: ffffffffffffffda RBX: 00005646e0680350 RCX: > > 00007f03a6ba7dea > > > > [ 194.075154] RDX: 0000000000000020 RSI: 00005646e0680350 RDI: > > 0000000000000003 > > > > [ 194.075699] RBP: 00005646e06802a0 R08: 00007f03a6cae200 R09: > > 000000000000000c > > > > [ 194.076455] R10: 0000000000000000 R11: 0000000000000246 R12: > > 0000000000000000 > > > > [ 194.077197] R13: 0000000000000000 R14: 00007ffceb0ec75d R15: > > 0000000000000064 > > > > [ 194.077944] </TASK> > > > > [ 194.078321] Modules linked in: vp_vdpa vdpa kvm_intel kvm irqbypass fuse > > configfs xfs virtio_net net_failover failover virtio_pci > > virtio_pci_legacy_dev virtio_pci_modern_dev be2iscsi cxgb3i cxgb3 mdio > > libcxgbi libcxgb iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi > > autofs4 > > > > [ 194.080556] CR2: 00000000000000d0 > > > > [ 194.081040] ---[ end trace 0000000000000000 ]--- > > > > [ 194.660537] RIP: 0010:device_del+0x40/0x480 > > > > [ 194.662514] Code: 00 00 55 48 89 fd 53 48 83 ec 20 4c 8b 7f 40 4c 89 e7 > > 65 48 8b 05 10 bf 73 01 48 89 44 24 18 31 c0 e8 b4 2f 63 00 48 8b 55 48 > > <0f> b6 82 d0 00 00 00 a8 01 75 09 83 c8 01 88 82 d0 00 00 00 4c 89 > > > > [ 194.664367] RSP: 0018:ffa00000004dba90 EFLAGS: 00010246 > > > > [ 194.664996] RAX: 0000000000000000 RBX: ff110000089f1720 RCX: > > ffffffffa05f2200 > > > > [ 194.665760] RDX: 0000000000000000 RSI: ff11000018296800 RDI: > > ff11000018297080 > > > > [ 194.666527] RBP: ff11000018297000 R08: ff1100000a3ea048 R09: > > ffa00000004dbc50 > > > > [ 194.667300] R10: ff11000006abae00 R11: 0000000000000026 R12: > > ff11000018297080 > > > > [ 194.668066] R13: ff1100000571c300 R14: ffa00000004dbc50 R15: > > 0000000000000000 > > > > [ 194.668823] FS: 00007f03a6a95740(0000) GS:ff110000d8597000(0000) > > knlGS:0000000000000000 > > > > [ 194.669653] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > > [ 194.670322] CR2: 00000000000000d0 CR3: 0000000007830004 CR4: > > 0000000000773ef0 > > > > [ 194.671083] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > 0000000000000000 > > > > [ 194.671845] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: > > 0000000000000400 > > > > [ 194.672607] PKRU: 55555554 > > > > [ 194.673042] note: vdpa[13582] exited with irqs disabled > > > > Killed > > > > > > Best Regards, > > > > > > wenli > > Thanks >
