Hi,
passing a device through to a guest I sometimes get the following WARN
message on the host:
Dec 8 12:28:52 astat kernel: [ 248.472109] WARNING: at
kernel/irq/manage.c:225 enable_irq+0x6b/0x90()
Dec 8 12:28:52 astat kernel: [ 248.472114] Unbalanced enable for IRQ 488
Dec 8 12:28:52 astat kernel: [ 248.472118] Modules linked in: kvm_amd kvm
af_packet radeon drm rfcomm sco bridge stp bnep l2cap bluetooth ppdev ipv6
powernow_k8 cpufreq_stats cpufreq_powersave cpufreq_conservative
cpufreq_ondemand freq_table cpufreq_userspace video output rfkill input_polldev
sbs sbshc battery iptable_filter ip_tables x_tables ac parport_pc lp parport
psmouse serio_raw pcspkr i2c_piix4 i2c_core shpchp pci_hotplug container button
evdev ext3 jbd mbcache usbhid hid sg sd_mod atiixp pata_acpi ata_generic
ehci_hcd pata_atiixp ahci ohci_hcd bnx2 libata scsi_mod usbcore thermal
processor fan thermal_sys fuse
Dec 8 12:28:52 astat kernel: [ 248.472205] Pid: 5520, comm: qemu-system-x86
Tainted: G W 2.6.28-rc7 #3
Dec 8 12:28:52 astat kernel: [ 248.472210] Call Trace:
Dec 8 12:28:52 astat kernel: [ 248.472224] [<ffffffff8024124d>]
warn_slowpath+0xcd/0x110
Dec 8 12:28:52 astat kernel: [ 248.472235] [<ffffffff8035cfd1>]
elv_insert+0x141/0x300
Dec 8 12:28:52 astat kernel: [ 248.472243] [<ffffffff8035d9b3>]
drive_stat_acct+0xc3/0xf0
Dec 8 12:28:52 astat kernel: [ 248.472250] [<ffffffff8035fe19>]
__make_request+0xf9/0x4d0
Dec 8 12:28:52 astat kernel: [ 248.472256] [<ffffffff802355e8>]
enqueue_task_fair+0x188/0x1e0
Dec 8 12:28:52 astat kernel: [ 248.472290] [<ffffffffa0351319>]
gfn_to_hva+0x9/0x70 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472318] [<ffffffffa0351621>]
kvm_read_guest_page+0x61/0x70 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472343] [<ffffffffa0351319>]
gfn_to_hva+0x9/0x70 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472367] [<ffffffffa0351621>]
kvm_read_guest_page+0x61/0x70 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472390] [<ffffffffa0351678>]
kvm_read_guest+0x48/0x80 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472415] [<ffffffffa0361a1c>]
paging64_walk_addr+0x17c/0x330 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472422] [<ffffffff8028983b>]
enable_irq+0x6b/0x90
Dec 8 12:28:52 astat kernel: [ 248.472447] [<ffffffffa0354359>]
kvm_notify_acked_irq+0x39/0x60 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472471] [<ffffffffa0353eb2>]
kvm_ioapic_update_eoi+0x42/0x90 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472495] [<ffffffffa036a4eb>]
apic_mmio_write+0x50b/0x6c0 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472505] [<ffffffff8021ef25>]
do_suspend_lowlevel+0x65/0x130
Dec 8 12:28:52 astat kernel: [ 248.472529] [<ffffffffa035b30b>]
emulator_write_emulated_onepage+0x9b/0x120 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472556] [<ffffffffa0362f03>]
x86_emulate_insn+0x423/0x4a40 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472583] [<ffffffffa0367872>]
x86_decode_insn+0x352/0xed0 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472607] [<ffffffffa03550d9>]
kvm_get_cs_db_l_bits+0x29/0x50 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472633] [<ffffffffa03575a7>]
emulate_instruction+0x127/0x330 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472657] [<ffffffffa03608cc>]
kvm_mmu_page_fault+0x5c/0xa0 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472681] [<ffffffffa0359929>]
kvm_arch_vcpu_ioctl_run+0x299/0x850 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472705] [<ffffffffa03507cb>]
kvm_vcpu_ioctl+0x2fb/0x5b0 [kvm]
Dec 8 12:28:52 astat kernel: [ 248.472714] [<ffffffff802d4b2f>]
vfs_ioctl+0x2f/0xb0
Dec 8 12:28:52 astat kernel: [ 248.472721] [<ffffffff802d4c2c>]
do_vfs_ioctl+0x7c/0x480
Dec 8 12:28:52 astat kernel: [ 248.472728] [<ffffffff80266754>]
sys_futex+0xc4/0x170
Dec 8 12:28:52 astat kernel: [ 248.472735] [<ffffffff802d50d1>]
sys_ioctl+0xa1/0xb0
Dec 8 12:28:52 astat kernel: [ 248.472741] [<ffffffff8020c30b>]
system_call_fastpath+0x16/0x1b
Dec 8 12:28:52 astat kernel: [ 248.472746] ---[ end trace 0f717136b7f1724f
]---
IRQ 488 is assigned to the device passed through to the guest.
Joerg
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