Re: [Bugfix 0/3] Fix regressions in Xen IRQ management

From: Jiang Liu
Date: Mon Jan 19 2015 - 09:20:44 EST

On 2015/1/19 20:34, Sander Eikelenboom wrote:
>
> Monday, January 19, 2015, 5:55:41 AM, you wrote:
>
>> Hi all,
>> Sander reports an Xen pci-passthrough regression caused by
>> commit cffe0a2b5a34c95a4dadc9ec7132690a5b0f6687 ("x86, irq: Keep
>> balance of IOAPIC pin reference count"). This patch set tries to
>> fix it.
>
>> Patch 1 is a fix for another issue found during fixing the regression.
>> Patch 2 is a hotfix for the regression and should be targeted for v3.19.
>> Patch 3 is the foundamental fix for the regression and should be targeted
>> at v3.20.
>
>> Hi Sander,
>> Could you please help to test by:
>> 1) only apply patch 1 and patch 2
>> 2) and then apply patch 3 ontop of patch 1/2.
>> Thanks!
>> Gerry
>
> Hi Gerry / David / Konrad,
>
> My test results:
>
> - On intel:
> - With apic v4 series and only patch 1 + 2 of this series:
> - powerbutton is still working as expected due to apic v4 series
> - irq's are delivered to the passed through wifi device,
> the wifi device is working now, so that's good !
> - However now i get this splat in dom0,
> (haven't seen this one before,
> but unfortunately i don't seem to be able to trigger it reliably (only hit this once in 10 boots),
> and i also don't know for sure if it's even due to this patch set or not):
> [ 2361.607881] irq 18: nobody cared (try booting with the "irqpoll" option)
> [ 2361.650103] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.19.0-rc5-creanuc-20150119-doflr-apicv4-apicpcipt12+ #1
> [ 2361.670344] Hardware name: /D53427RKE, BIOS RKPPT10H.86A.0017.2013.0425.1251 04/25/2013
> [ 2361.690787] 0000000000000000 ffff8800596aee8c ffffffff818af9e7 ffff8800596aee00
> [ 2361.711547] ffffffff8108151c ffff8800596aee00 0000000000000000 0000000000000000
> [ 2361.732474] ffffffff81081929 0000000000000000 0000000000000000 0000000000000012
> [ 2361.753265] Call Trace:
> [ 2361.773907] <IRQ> [<ffffffff818af9e7>] ? dump_stack+0x40/0x50
> [ 2361.795077] [<ffffffff8108151c>] ? __report_bad_irq+0x1e/0xbb
> [ 2361.815844] [<ffffffff81081929>] ? note_interrupt+0x1a9/0x234
> [ 2361.835965] [<ffffffff8107fa8f>] ? handle_irq_event_percpu+0xd7/0xf1
> [ 2361.856384] [<ffffffff8107fae0>] ? handle_irq_event+0x37/0x57
> [ 2361.876775] [<ffffffff81082212>] ? handle_fasteoi_irq+0x74/0xcb
> [ 2361.896812] [<ffffffff8107f47a>] ? generic_handle_irq+0x15/0x20
> [ 2361.916476] [<ffffffff813bf5e7>] ? evtchn_fifo_handle_events+0x138/0x16f
> [ 2361.936105] [<ffffffff813bd3a5>] ? __xen_evtchn_do_upcall+0x39/0x69
> [ 2361.955986] [<ffffffff813be71d>] ? xen_evtchn_do_upcall+0x27/0x36
> [ 2361.975998] [<ffffffff818b881e>] ? xen_do_hypervisor_callback+0x1e/0x30
> [ 2361.996017] <EOI> [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
> [ 2362.016394] [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
> [ 2362.036886] [<ffffffff81007138>] ? xen_safe_halt+0xc/0x13
> [ 2362.057118] [<ffffffff81013add>] ? default_idle+0x5/0x8
> [ 2362.077309] [<ffffffff81078b52>] ? cpu_startup_entry+0x114/0x25e
> [ 2362.097612] [<ffffffff81effe9d>] ? start_kernel+0x422/0x42d
> [ 2362.118041] [<ffffffff81eff880>] ? set_init_arg+0x50/0x50
> [ 2362.138141] [<ffffffff81f029a0>] ? xen_start_kernel+0x4d3/0x4db
> [ 2362.157862] handlers:
> [ 2362.177280] [<ffffffff8157567e>] ata_bmdma_interrupt
> [ 2362.196805] Disabling IRQ #18
> - attached complete proc-interrupts, lspci, dmesg and xl-dmesg attached as proc-interrupts12.txt, lspci12.txt, dmesg12.txt and xl-dmesg12.txt
>
>
> - With apic v4 series and patch 1 + 2 + 3 of this series:
> - powerbutton is still working as expected due to apic v4 series
> - irq's are delivered to the passed through wifi device,
> the wifi device is working now, so that's good !
> - I haven't seen the splat above so far,
> (but since i can't trigger it reliably that doesn't give any guarantees unfortunately).
>
> On AMD:
> - With apic v4 series and only patch 1 + 2 of this series:
> - powerbutton is still working as expected due to apic v4 series
> - videostream from passed through device is stable again, so that's good !
>
> - With apic v4 series and patch 1 + 2 + 3 of this series:
> - powerbutton is still working as expected due to apic v4 series
> - videostream from passed through device is stable again, so that's good !
>
>
> So to summarize:
> The reported problems are fixed, everything looks good.
> Apart from a splat which occurs infrequently and from which i don't know
> if it is due to this patch set anyway.
>
> So i'm very much inclined to say:
> Tested-by: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Thanks for your great efforts to tests those patches, Sander.
I will send out formal patch set for 3.19 tomorrow.
Thanks!
Gerry

>
>
> Thanks Gerry !
>
> --
> Sander
>
>> Jiang Liu (3):
>> xen/irq, ACPI: Fix regression in xen PCI passthrough caused by
>> cffe0a2b5a34
>> xen/irq: Override ACPI IRQ management callback __acpi_unregister_gsi
>> x86/PCI: Refine the way to release PCI IRQ resources
>
>> arch/x86/include/asm/acpi.h | 1 +
>> arch/x86/include/asm/pci_x86.h | 2 --
>> arch/x86/pci/common.c | 30 ++++++++++++++++++++++++++++--
>> arch/x86/pci/intel_mid_pci.c | 4 ++--
>> arch/x86/pci/irq.c | 15 +--------------
>> arch/x86/pci/xen.c | 2 ++
>> drivers/acpi/pci_irq.c | 10 +---------
>> 7 files changed, 35 insertions(+), 29 deletions(-)
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