RE: [Xen-devel] pv-ops domU not working with MSI interrupts on N

I just checked the "xen dmesg". Look like DMA/iommu is the root cause of this issue. In order to tell the source of interrupt, Tachyon chip needs to do the DMA write to a dword memory location to indicate the source of interrupt. What iommu option do you recommend to use ?

(XEN) [VT-D]iommu.c:824: iommu_fault_status: Primary Pending Fault
(XEN) [VT-D]iommu.c:799: DMAR:[DMA Write] Request device [07:00.0] fault addr c00000, iommu reg = ffff82c3fff57000
(XEN) DMAR:[fault reason 05h] PTE Write access is not set
(XEN) print_vtd_entries: iommu = ffff83019fffa370 bdf = 7:0.0 gmfn = c00
(XEN)     root_entry = ffff83019ff70000
(XEN)     root_entry[7] = 19cf52001
(XEN)     context = ffff83019cf52000
(XEN)     context[0] = 102_706dc005
(XEN)     l4 = ffff8300706dc000
(XEN)     l4_index = 0
(XEN)     l4[0] = 706db003
(XEN)     l3 = ffff8300706db000
(XEN)     l3_index = 0
(XEN)     l3[0] = 706da003
(XEN)     l2 = ffff8300706da000
(XEN)     l2_index = 6
(XEN)     l2[6] = 0

-Ray

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Bruce Edge
Sent: Monday, September 27, 2010 9:46 PM
To: Jiang, Yunhong
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; Konrad Rzeszutek Wilk
Subject: Re: [Xen-devel] pv-ops domU not working with MSI interrupts on Nehalem

On Mon, Sep 27, 2010 at 8:26 PM, Jiang, Yunhong <yunhong.jiang@xxxxxxxxx> wrote:

"xm dmesg" should gives xen's boot log, and sometimes it contain some helpful information, I think, especially loglvl and guest_loglvl is set to all.

I looked at the xm dmesg output and there's nothing more than what I already provided, aside from a bunch of commands from me poking at it.

-Bruce

Thanks

--jyh

From: Bruce Edge [mailto:bruce.edge@xxxxxxxxx]
Sent: Tuesday, September 28, 2010 11:16 AM
To: Jiang, Yunhong
Cc: Konrad Rzeszutek Wilk; xen-devel@xxxxxxxxxxxxxxxxxxx

Subject: Re: [Xen-devel] pv-ops domU not working with MSI interrupts on Nehalem

On Mon, Sep 27, 2010 at 6:15 PM, Jiang, Yunhong <yunhong.jiang@xxxxxxxxx> wrote:

Is the 07:0.0 your tachyon device? The VT-d fault is suspcious.

Yes, there is 1 quad port card is this sytem:

07:00.0 Fibre Channel: PMC-Sierra Inc. Device 8032 (rev 08)

07:00.1 Fibre Channel: PMC-Sierra Inc. Device 8032 (rev 08)

07:00.2 Fibre Channel: PMC-Sierra Inc. Device 8032 (rev 08)

07:00.3 Fibre Channel: PMC-Sierra Inc. Device 8032 (rev 08)

Also is it possible to share the xen output?

I attached the dom0 boot output. Let me know if you wanted something else.

Also, here's the dom0 console output upon starting the VM: This lockdep error started with the release of 2.6.32.21. Note that I'm running the same kernel for the domU and dom0.

[ 1817.684097] ------------[ cut here ]------------

[ 1817.684113] WARNING: at kernel/lockdep.c:2323 trace_hardirqs_on_caller+0x12f/0x190()

[ 1817.684119] Hardware name: ProLiant DL380 G6

[ 1817.684122] Modules linked in: xt_physdev ipv6 osa_mfgdom0 xenfs xen_gntdev fbcon tileblit font bitblit softcursor xen_evtchn xen_pciback radeon ttm drm_kms_helper tun drm i2c_algo_bit ipmi_si i2c_core ipmi_msghandler joydev serio_raw hpwdt hpilo bridge stp llc usbhid hid cciss usb_storage

[ 1817.684190] Pid: 11, comm: xenwatch Not tainted 2.6.32.21-xenoprof-1 #1

[ 1817.684195] Call Trace:

[ 1817.684197] <IRQ> [<ffffffff810aa18f>] ? trace_hardirqs_on_caller+0x12f/0x190

[ 1817.684209] [<ffffffff8106bed0>] warn_slowpath_common+0x80/0xd0

[ 1817.684217] [<ffffffff815f2b80>] ? _spin_unlock_irq+0x30/0x40

[ 1817.684223] [<ffffffff8106bf34>] warn_slowpath_null+0x14/0x20

[ 1817.684229] [<ffffffff810aa18f>] trace_hardirqs_on_caller+0x12f/0x190

[ 1817.684234] [<ffffffff810aa1fd>] trace_hardirqs_on+0xd/0x10

[ 1817.684240] [<ffffffff815f2b80>] _spin_unlock_irq+0x30/0x40

[ 1817.684266] [<ffffffff813c4fc5>] add_to_net_schedule_list_tail+0x85/0xd0

[ 1817.684271] [<ffffffff813c6216>] netif_be_int+0x36/0x160

[ 1817.684278] [<ffffffff810e10d0>] handle_IRQ_event+0x70/0x180

[ 1817.684284] [<ffffffff810e36e9>] handle_edge_irq+0xc9/0x170

[ 1817.684291] [<ffffffff813b8d7f>] __xen_evtchn_do_upcall+0x1bf/0x1f0

[ 1817.684297] [<ffffffff813b92fd>] xen_evtchn_do_upcall+0x3d/0x60

[ 1817.684304] [<ffffffff8101647e>] xen_do_hypervisor_callback+0x1e/0x30

[ 1817.684308] <EOI> [<ffffffff8100940a>] ? hypercall_page+0x40a/0x1010

[ 1817.684319] [<ffffffff8100940a>] ? hypercall_page+0x40a/0x1010

[ 1817.684325] [<ffffffff813bce54>] ? xb_write+0x1e4/0x290

[ 1817.684330] [<ffffffff813bd8ca>] ? xs_talkv+0x6a/0x1f0

[ 1817.684336] [<ffffffff813bd8d8>] ? xs_talkv+0x78/0x1f0

[ 1817.684341] [<ffffffff813bdbcd>] ? xs_single+0x4d/0x60

[ 1817.684346] [<ffffffff813be502>] ? xenbus_read+0x52/0x80

[ 1817.684352] [<ffffffff813c87fc>] ? frontend_changed+0x48c/0x770

[ 1817.684358] [<ffffffff813bf76d>] ? xenbus_otherend_changed+0xdd/0x1b0

[ 1817.684365] [<ffffffff8101122f>] ? xen_restore_fl_direct_end+0x0/0x1

[ 1817.684371] [<ffffffff810ac830>] ? lock_release+0xb0/0x230

[ 1817.684376] [<ffffffff813bfae0>] ? frontend_changed+0x10/0x20

[ 1817.684382] [<ffffffff813bd4f5>] ? xenwatch_thread+0x55/0x160

[ 1817.684389] [<ffffffff81093400>] ? autoremove_wake_function+0x0/0x40

[ 1817.684394] [<ffffffff813bd4a0>] ? xenwatch_thread+0x0/0x160

[ 1817.684400] [<ffffffff81093086>] ? kthread+0x96/0xb0

[ 1817.684405] [<ffffffff8101632a>] ? child_rip+0xa/0x20

[ 1817.684410] [<ffffffff81015c90>] ? restore_args+0x0/0x30

[ 1817.684415] [<ffffffff81016320>] ? child_rip+0x0/0x20

-Bruce

Thanks
--jyh

>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Bruce Edge
>Sent: Tuesday, September 28, 2010 7:54 AM
>To: Konrad Rzeszutek Wilk
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx

>Subject: Re: [Xen-devel] pv-ops domU not working with MSI interrupts on Nehalem
>

>On Mon, Sep 27, 2010 at 12:54 PM, Konrad Rzeszutek Wilk
><konrad.wilk@xxxxxxxxxx> wrote:
>> On Mon, Sep 27, 2010 at 12:16:50PM -0700, Bruce Edge wrote:
>>> On Mon, Sep 27, 2010 at 10:24 AM, Konrad Rzeszutek Wilk
>>> <konrad.wilk@xxxxxxxxxx> wrote:
>>> >
>>> > On Mon, Sep 27, 2010 at 08:52:39AM -0700, Bruce Edge wrote:
>>> > > One of our developers who is working on a tachyon driver is
>>> > > complaining that the pvops domU kernel is not working for these MSI
>>> > > interrupts.
>>> > > This is using the current head of xen/2.6.32.x on both a single
>>> > > Nahelam 920 and a dual E5540. This behavior is consistent with Xen
>>> > > 4.0.1, 4.0.2.rc1-pre and 4.1.
>>> > >
>>> > > Here are his comments:
>>> > >
>>> > > - the driver has no problem to enable msi interrupt and request the
>>> > > interrupt through kernel functions pci_enable_msi & request_irq
>>> >
>>> > What shows up in the Xen console when you send the 'q' key? Does it
>>> > show that the vector is assigned to the appropiate guest?
>>>
>>> The Xen console q key shows that the domU is assigned:
>>>
>>> (XEN) Interrupts { 32, 41-42, 47 }
>>
>> Aha!
>>
>>>
>>> but the domU thinks it has:
>>>
>>> 124/125/126/127
>>>
>>> Is there some mapping that's taking place, or is this plain wrong?
>>
>> That looks wrong. The IRQ numbers (even though they are MSI vectors) are
>> setup as IRQ numbers in the DomU guest. You should have seen
>>
>> 32:
>> 41:
>> 42:
>> 47:
>> in you /proc/interrupts on your DomU guest.
>>
>> I wonder what broke - can you use
>git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
>> devel/xen-pcifront-0.5 (or pv/pcifront-2.6.32)?
>
>Please forgive the git ignorance.
>
>Is this the right syntax?
>
>git clone git://git.kernel.org/pub/scm/linux/kernel/git/konrad:pv/pcifront-2.6.32
>linux-2.6.32-pv-pcifront
>
>Initialized empty Git repository in
>/import/kaan/bedge/src/xen/kernel/pv-ops/linux-2.6.32-pv-pcifront/.git/
>fatal: The remote end hung up unexpectedly
>
>Or:
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
>
>Initialized empty Git repository in
>/import/kaan/bedge/src/xen/kernel/pv-ops/xen/.git/
>remote: error: Could not read 59eab2f8f04147c5aadc99f2034ca7e5b81e890f
>remote: fatal: Failed to traverse parents of commit
>979e121cb348add17ed8171bf447b27a3a9d1be3
>remote: aborting due to possible repository corruption on the remote side.
>fatal: early EOF
>fatal: index-pack failed
>
>>
>> It has the latest pcifront driver but without the PVonHVM enhancments
>> so we can try to eliminate the PvONHVM logic out of the picture.
>>
>>>
>>> >
>>> > > - the interrupt does happen. But the interrupt service routine of
>>> > > tachyon driver doesn't detect any interrupt status related to this
>>> > > interrupt, which inhibits the tachyon chip from coming on-line. And
>>> > > there are high count of tachyon interrupt in /proc/interrupts
>>> >
>>> > Is it checking the PCI_STATUS_INTERRUPT or the appropiate register
>>> > in the MMIO BAR?
>>> >
>>>
>>> The driver would check the appropriate register (tachyon registers) in
>>> the MMIO to determine the source of interrupts.
>>
>> OK, so that isn't it. Is there anything at these vectors:
>> 7c, 7d, 7e, and 7f? When you use xen debug-keys 'i' or 'q' it should give you
>> an inkling what device this is set for.
>
>When I run a distro kernel in hvm mode, I get the expected irq mappings:
>
>'i' - Note 66 - 69
>(XEN) IRQ: 66 affinity:ffffffff,ffffffff,ffffffff,ffffffff vec:3a
>type=PCI-MSI status=00000010 in-flight=0
>domain-list=10:127(----),
>(XEN) IRQ: 67 affinity:ffffffff,ffffffff,ffffffff,ffffffff vec:42
>type=PCI-MSI status=00000010 in-flight=0
>domain-list=10:126(----),
>(XEN) IRQ: 68 affinity:ffffffff,ffffffff,ffffffff,ffffffff vec:4a
>type=PCI-MSI status=00000010 in-flight=0
>domain-list=10:125(----),
>(XEN) IRQ: 69 affinity:ffffffff,ffffffff,ffffffff,ffffffff vec:52
>type=PCI-MSI status=00000010 in-flight=0
>domain-list=10:124(----)
>
>
>'q'
>(XEN) Interrupts { 32, 41-42, 47, 124-127 }
>
>
>The same data with pv-ops kernel shows:
>
>'i'
>IRQ numbers stop at 65, no 66 - 69 present:
>
>(XEN) IRQ: 63 affinity:ffffffff,ffffffff,ffffffff,ffffffff vec:91
>type=PCI-MSI status=00000010 in-flight=0
>domain-list=0:289(----),
>(XEN) IRQ: 64 affinity:ffffffff,ffffffff,ffffffff,ffffffff vec:99
>type=PCI-MSI status=00000002 mapped, unbound
>(XEN) IRQ: 65 affinity:ffffffff,ffffffff,ffffffff,ffffffff vec:b1
>type=PCI-MSI status=00000010 in-flight=0
>domain-list=0:287(----),
>(XEN) IO-APIC interrupt information:
>
>'q'
>(XEN) Interrupts { 32, 41-42, 47 }
>
>>
>>>
>>> > >
>>> > > kaan-18-dpm:~# cat /proc/interrupts | grep TACH
>>> > >
>124: 760415 0 0 0 0
> 0
>>> > > 0 0 0 0 0
> 0
>>> > >    0 0 xen-pirq-pcifront-msi HW_TACHYON
>>> > >
>125: 762234 0 0 0 0
> 0
>>> > > 0 0 0 0 0
> 0
>>> > >    0 0 xen-pirq-pcifront-msi HW_TACHYON
>>> > >
>126: 764180 0 0 0 0
> 0
>>> > > 0 0 0 0 0
> 0
>>> > >    0 0 xen-pirq-pcifront-msi HW_TACHYON
>>> > >
>127: 764164 0 0 0 0
> 0
>>> > > 0 0 0 0 0
> 0
>>> > >    0 0 xen-pirq-pcifront-msi HW_TACHYON
>>> >
>>> > Can you provide the full dmesg output?
>>>
>>> Attached.
>>>
>>> Some possibly related messages on dom0 console:
>>>
>>> [ 1882.269778] pciback 0000:07:00.0: enabling device (0000 -> 0003)
>>> [ 1882.269800] xen: registering gsi 32 triggering 0 polarity 1
>>> [ 1882.269827] xen_allocate_pirq: returning irq 32 for gsi 32
>>> [ 1882.269834] xen: --> irq=32
>>> [ 1882.269841] Already setup the GSI :32
>>> [ 1882.269847] pciback 0000:07:00.0: PCI INT A -> GSI 32 (level, low) -> IRQ 32
>>> [ 1882.269866] pciback 0000:07:00.0: setting latency timer to 64
>>> [ 1882.270463] pciback 0000:07:00.0: Driver tried to write to a
>>> read-only configuration space field at offset 0x62, size 2. This may
>>> be harmless, but if you have problems with your device:
>>
>> Uhhh, for that I think you need to do 'lspci -vvv -xxx -s 07:00.00'
>> to find out what is at the configuration space. You could enable
>> it using the permissive attribute.
>>
>>> [ 1882.270465] 1) see permissive attribute in sysfs
>>> [ 1882.270467] 2) report problems to the xen-devel mailing list along
>>> with details of your device obtained from lspci.
>>> [ 1882.270615] alloc irq_desc for 478 on node 0
>>> [ 1882.270625] alloc kstat_irqs on node 0
>>
>> So for 478: what do you see? xen-pciback I presume?
>>> [ 1882.348411] pciback 0000:07:00.1: enabling device (0000 -> 0003)
>>> [ 1882.348433] xen: registering gsi 42 triggering 0 polarity 1
>>> [ 1882.348440] xen_allocate_pirq: returning irq 42 for gsi 42
>>> [ 1882.348445] xen: --> irq=42
>>> [ 1882.348472] Already setup the GSI :42
>>> [ 1882.348479] pciback 0000:07:00.1: PCI INT B -> GSI 42 (level, low) -> IRQ 42
>>> [ 1882.348497] pciback 0000:07:00.1: setting latency timer to 64
>>> [ 1882.349063] pciback 0000:07:00.1: Driver tried to write to a
>>> read-only configuration space field at offset 0x62, size 2. This may
>>> be harmless, but if you have problems with your device:
>>> [ 1882.349066] 1) see permissive attribute in sysfs
>>> [ 1882.349067] 2) report problems to the xen-devel mailing list along
>>> with details of your device obtained from lspci.
>>> [ 1882.349205] alloc irq_desc for 477 on node 0
>>> [ 1882.349215] alloc kstat_irqs on node 0
>>> [ 1882.402893] pciback 0000:07:00.2: enabling device (0000 -> 0003)
>>> [ 1882.402908] xen: registering gsi 47 triggering 0 polarity 1
>>> [ 1882.402913] xen_allocate_pirq: returning irq 47 for gsi 47
>>> [ 1882.402916] xen: --> irq=47
>>> [ 1882.402921] Already setup the GSI :47
>>> [ 1882.402925] pciback 0000:07:00.2: PCI INT C -> GSI 47 (level, low) -> IRQ 47
>>> [ 1882.402938] pciback 0000:07:00.2: setting latency timer to 64
>>> [ 1882.403280] pciback 0000:07:00.2: Driver tried to write to a
>>> read-only configuration space field at offset 0x62, size 2. This may
>>> be harmless, but if you have problems with your device:
>>> [ 1882.403282] 1) see permissive attribute in sysfs
>>> [ 1882.403282] 2) report problems to the xen-devel mailing list along
>>> with details of your device obtained from lspci.
>>> [ 1882.403380] alloc irq_desc for 476 on node 0
>>> [ 1882.403386] alloc kstat_irqs on node 0
>>> (XEN) [VT-D]iommu.c:824: iommu_fault_status: Primary Pending Fault
>>> (XEN) [VT-D]iommu.c:799: DMAR:[DMA Write] Request device [07:00.0]
>>> fault addr e6f80000, iommu reg = ffff82c3fff57000
>>> (XEN) DMAR:[fault reason 05h] PTE Write access is not set
>>> (XEN) print_vtd_entries: iommu = ffff83019fffa370 bdf = 7:0.0 gmfn = e6f80
>>> (XEN) root_entry = ffff83019ff70000
>>> (XEN) root_entry[7] = 19cf52001
>>> (XEN) context = ffff83019cf52000
>>> (XEN) context[0] = 102_706dc005
>>> (XEN) l4 = ffff8300706dc000
>>> (XEN) l4_index = 0
>>> (XEN) l4[0] = 706db003
>>> (XEN) l3 = ffff8300706db000
>>> (XEN) l3_index = 3
>>> (XEN) l3[3] = 702b6003
>>> (XEN) l2 = ffff8300702b6000
>>> (XEN) l2_index = 137
>>> (XEN) l2[137] = 0
>>> (XEN) l2[137] not present
>>> (XEN) traps.c:466:d0 Unhandled nmi fault/trap [#2] on VCPU 0 [ec=0000]
>>
>> That is not good. What changed from your earlier emails that this was triggered?
>
>Nothing
>> Or was it triggered all along?
>
>Yes, I just included it for completeness
>
>> What happens if you run the system without the iommu enabled?
>
>Haven't tried yet. Will check that next.
>
>-Bruce
>

>_______________________________________________
>Xen-devel mailing list
>Xen-devel@xxxxxxxxxxxxxxxxxxx
>http://lists.xensource.com/xen-devel

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

WARNING - OLD ARCHIVES

xen-devel

RE: [Xen-devel] pv-ops domU not working with MSI interrupts on Nehalem