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xen-devel
[Xen-devel] pv-on-hvm kexec, howto reregister timer interrupt
What is the best way to reregister the timer interrupt in the kexec
kernel in a pv-on-hvm guest? Right now the crash shown below happens
because EVTCHNOP_bind_virq returns -EEXIST. Can the timer on the cpus be
unregistered during shutdown? xen_teardown_timer() does not allow that
for cpu #0. I added some silly loop which tries to match vcpu/cpu in
bind_virq_to_irq() using EVTCHNOP_status to find the currently used port
number. This helps and booting proceeds, but I feel that cant be the
right approach.
Olaf
....
[ 0.000000] No AGP bridge found
[ 0.000000] Memory: 486288k/524288k available (2812k kernel code, 452k
absent, 37548k reserved, 3557k data, 480k init)
[ 0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=8,
Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] NR_IRQS:4352 nr_irqs:1152 16
[ 0.000000] Xen HVM callback vector for event delivery is enabled
[ 0.000000] Console: colour VGA+ 80x25
[ 0.000000] console [ttyS0] enabled
[ 0.000000] Detected 2793.044 MHz processor.
[ 0.004000] Calibrating delay loop (skipped), value calculated using timer
frequency.. 5586.08 BogoMIPS (lpj=11172176)
[ 0.004000] pid_max: default: 32768 minimum: 301
[ 0.004000] Mount-cache hash table entries: 256
[ 0.004231] CPU: Physical Processor ID: 0
[ 0.005459] CPU: Processor Core ID: 0
[ 0.008671] ACPI: Core revision 20110413
[ 0.020172] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=0 pin2=0
[ 0.061644] CPU0: Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz stepping 05
[ 0.063779] Xen: using vcpuop timer interface
[ 0.064006] installing Xen timer for CPU 0
[ 0.065166] ------------[ cut here ]------------
[ 0.066468] kernel BUG at drivers/xen/events.c:902!
[ 0.067855] invalid opcode: 0000 [#1] SMP
[ 0.068003] CPU 0
[ 0.068003] Modules linked in:
[ 0.068003]
[ 0.068003] Pid: 1, comm: swapper Not tainted
3.0.0-20110722.1852.20-kernel-linux-3_0 #1 Xen HVM domU
[ 0.068003] RIP: 0010:[<ffffffff811b41dc>] [<ffffffff811b41dc>]
bind_virq_to_irq+0xac/0x170
[ 0.068003] RSP: 0018:ffff88001d89fe20 EFLAGS: 00010282
[ 0.068003] RAX: ffffffffffffffef RBX: 0000000000000040 RCX: 0000000000000246
[ 0.068003] RDX: 00000000ffffffef RSI: ffff88001d89fe40 RDI: 0000000000000001
[ 0.068003] RBP: 0000000000000000 R08: ffff88001d807500 R09: ffffffff818ee2e8
[ 0.068003] R10: 000000000000005a R11: 0000000000000000 R12: 0000000000000000
[ 0.068003] R13: 0000000000000000 R14: 000000000000ebe0 R15: 0000000000000000
[ 0.068003] FS: 0000000000000000(0000) GS:ffff88001ea00000(0000)
knlGS:0000000000000000
[ 0.068003] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 0.068003] CR2: 00007f7c9b6e0ae0 CR3: 0000000001603000 CR4: 00000000000006b0
[ 0.068003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.068003] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 0.068003] Process swapper (pid: 1, threadinfo ffff88001d89e000, task
ffff88001d8a0000)
[ 0.068003] Stack:
[ 0.068003] ffff88001d89fe80 0000000000000000 0000000000000000
0000000000000000
[ 0.068003] 0000000000000000 0000000000000000 ffffffff81636120
0000000000000000
[ 0.068003] 0000000000000000 ffff88001d830050 000000000001ce20
ffffffff81007870
[ 0.068003] Call Trace:
[ 0.068003] [<ffffffff81007870>] ? xen_hvm_setup_cpu_clockevents+0x20/0x20
[ 0.068003] [<ffffffff811b479d>] ? bind_virq_to_irqhandler+0x2d/0x80
[ 0.068003] [<ffffffff81007801>] ? xen_setup_timer+0x51/0xa0
[ 0.068003] [<ffffffff816500e2>] ? xen_time_init+0x8a/0xaf
[ 0.068003] [<ffffffff81659031>] ? native_smp_prepare_cpus+0x216/0x374
[ 0.068003] [<ffffffff816508bc>] ? xen_hvm_smp_prepare_cpus+0x9/0x2e
[ 0.068003] [<ffffffff8164c551>] ? kernel_init+0x3f/0x128
[ 0.068003] [<ffffffff812bc604>] ? kernel_thread_helper+0x4/0x10
[ 0.068003] [<ffffffff8164c512>] ? parse_early_options+0x1a/0x1a
[ 0.068003] [<ffffffff812bc600>] ? gs_change+0x13/0x13
[ 0.068003] Code: 63 81 e8 f8 dc ec ff 44 89 64 24 20 44 89 6c 24 24 bf 01
00 00 00 48 8d 74 24 20 e8 2f d2 e4 ff 83 f8 da 89 c2 74 6e 85 d2 74 04 <0f> 0b
eb fe 89 df 8b 6c 24 28 e8 b5 e5 ff ff 48 89 c1 8b 40 10
[ 0.068003] RIP [<ffffffff811b41dc>] bind_virq_to_irq+0xac/0x170
[ 0.068003] RSP <ffff88001d89fe20>
[ 0.132010] ---[ end trace 4eaa2a86a8e2da22 ]---
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