On Thu, Dec 09, 2021, Maxim Levitsky wrote: > > KVM: SVM: Remove unnecessary APICv/AVIC update in vCPU unblocking path ... > Probably just luck (can't reproduce this anymore) but > while running some kvm unit tests with this patch series (and few my patches > for AVIC co-existance which shouldn't affect this) I got this > > (warning about is_running already set) My best guess would be the above commit that dropped the handling in the unblock path, but I haven't been able to concoct a scenario where avic_physical_id_cache can get out of sync with respect to kvm_vcpu_apicv_active(). > Dec 08 22:53:26 amdlaptop kernel: ------------[ cut here ]------------ > Dec 08 22:53:26 amdlaptop kernel: WARNING: CPU: 3 PID: 72804 at arch/x86/kvm/svm/avic.c:1045 avic_vcpu_load+0xe3/0x100 [kvm_amd] > Dec 08 22:53:26 amdlaptop kernel: Modules linked in: kvm_amd(O) ccp rng_core kvm(O) irqbypass xt_conntrack ip6table_filter ip6_tables snd_soc_dmic snd_acp3x_> > Dec 08 22:53:26 amdlaptop kernel: r8169 realtek 8250_pci usbmon nbd fuse autofs4 [last unloaded: rng_core] > Dec 08 22:53:26 amdlaptop kernel: CPU: 3 PID: 72804 Comm: qemu-system-i38 Tainted: G O 5.16.0-rc4.unstable #6 > Dec 08 22:53:26 amdlaptop kernel: Hardware name: LENOVO 20UF001CUS/20UF001CUS, BIOS R1CET65W(1.34 ) 06/17/2021 > Dec 08 22:53:26 amdlaptop kernel: RIP: 0010:avic_vcpu_load+0xe3/0x100 [kvm_amd] > Dec 08 22:53:26 amdlaptop kernel: Code: 0d 9f e0 85 c0 74 e8 4c 89 f6 4c 89 ff e8 a5 99 f4 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b 5b 41 5c 41 5d 41 5e 41 > > Dec 08 22:53:26 amdlaptop kernel: RSP: 0018:ffffc9000b17bba8 EFLAGS: 00010247 > Dec 08 22:53:26 amdlaptop kernel: RAX: 6f63203a756d6571 RBX: ffff888106194740 RCX: ffff88812e7ac000 > Dec 08 22:53:26 amdlaptop kernel: RDX: ffff8883ff6c0000 RSI: 0000000000000003 RDI: 0000000000000003 > Dec 08 22:53:26 amdlaptop kernel: RBP: ffffc9000b17bbd0 R08: ffff888106194740 R09: 0000000000000000 > Dec 08 22:53:26 amdlaptop kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003 > Dec 08 22:53:26 amdlaptop kernel: R13: 0000000000000003 R14: ffff88810023b060 R15: dead000000000100 > Dec 08 22:53:26 amdlaptop kernel: FS: 0000000000000000(0000) GS:ffff8883ff6c0000(0000) knlGS:0000000000000000 > Dec 08 22:53:26 amdlaptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > Dec 08 22:53:26 amdlaptop kernel: CR2: 00005587e812f958 CR3: 0000000105f31000 CR4: 0000000000350ee0 > Dec 08 22:53:26 amdlaptop kernel: DR0: 00000000004008da DR1: 0000000000000000 DR2: 0000000000000000 > Dec 08 22:53:26 amdlaptop kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Dec 08 22:53:26 amdlaptop kernel: Call Trace: > Dec 08 22:53:26 amdlaptop kernel: <TASK> > Dec 08 22:53:26 amdlaptop kernel: svm_vcpu_load+0x56/0x60 [kvm_amd] > Dec 08 22:53:26 amdlaptop kernel: kvm_arch_vcpu_load+0x32/0x210 [kvm] > Dec 08 22:53:26 amdlaptop kernel: vcpu_load+0x34/0x40 [kvm] > Dec 08 22:53:26 amdlaptop kernel: kvm_arch_destroy_vm+0xd4/0x1c0 [kvm] > Dec 08 22:53:26 amdlaptop kernel: kvm_destroy_vm+0x163/0x250 [kvm] > Dec 08 22:53:26 amdlaptop kernel: kvm_put_kvm+0x26/0x40 [kvm] > Dec 08 22:53:26 amdlaptop kernel: kvm_vm_release+0x22/0x30 [kvm] > Dec 08 22:53:26 amdlaptop kernel: __fput+0x94/0x250 > Dec 08 22:53:26 amdlaptop kernel: ____fput+0xe/0x10 > Dec 08 22:53:26 amdlaptop kernel: task_work_run+0x63/0xa0 > Dec 08 22:53:26 amdlaptop kernel: do_exit+0x358/0xa30 > Dec 08 22:53:26 amdlaptop kernel: do_group_exit+0x3b/0xa0 > Dec 08 22:53:26 amdlaptop kernel: get_signal+0x15b/0x880 > Dec 08 22:53:26 amdlaptop kernel: ? _copy_to_user+0x20/0x30 > Dec 08 22:53:26 amdlaptop kernel: ? put_timespec64+0x3d/0x60 > Dec 08 22:53:26 amdlaptop kernel: arch_do_signal_or_restart+0x106/0x740 > Dec 08 22:53:26 amdlaptop kernel: ? hrtimer_nanosleep+0x9f/0x120 > Dec 08 22:53:26 amdlaptop kernel: ? __hrtimer_init+0xd0/0xd0 > Dec 08 22:53:26 amdlaptop kernel: exit_to_user_mode_prepare+0x112/0x1f0 > Dec 08 22:53:26 amdlaptop kernel: syscall_exit_to_user_mode+0x17/0x40 > Dec 08 22:53:26 amdlaptop kernel: do_syscall_64+0x42/0x80 > Dec 08 22:53:26 amdlaptop kernel: entry_SYSCALL_64_after_hwframe+0x44/0xae > Dec 08 22:53:26 amdlaptop kernel: RIP: 0033:0x7f537abb13b5 > Dec 08 22:53:26 amdlaptop kernel: Code: Unable to access opcode bytes at RIP 0x7f537abb138b. > Dec 08 22:53:26 amdlaptop kernel: RSP: 002b:00007f5376a39680 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 > Dec 08 22:53:26 amdlaptop kernel: RAX: fffffffffffffdfc RBX: 00007f5376a396d0 RCX: 00007f537abb13b5 > Dec 08 22:53:26 amdlaptop kernel: RDX: 00007f5376a396d0 RSI: 0000000000000000 RDI: 0000000000000000 > Dec 08 22:53:26 amdlaptop kernel: RBP: 00007f5376a396c0 R08: 0000000000000000 R09: 0000000000000000 > Dec 08 22:53:26 amdlaptop kernel: R10: 00007f5376a396c0 R11: 0000000000000293 R12: 00007f5376a3b640 > Dec 08 22:53:26 amdlaptop kernel: R13: 0000000000000002 R14: 00007f537ab66880 R15: 0000000000000000 > Dec 08 22:53:26 amdlaptop kernel: </TASK> > Dec 08 22:53:26 amdlaptop kernel: ---[ end trace 676058aaf29d0267 ]--- > > > I'll post my patches tomorrow, after some more testing. > > Best regards, > Maxim Levitsky >
