Re: [Xen-devel] [xen-unstable test] 145393: regressions - FAIL

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Dec 30, 2019 at 08:19:23PM +0000, osstest service owner wrote:
> flight 145393 xen-unstable real [real]
> http://logs.test-lab.xenproject.org/osstest/logs/145393/
> 
> Regressions :-(
> 
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-amd64-amd64-qemuu-nested-intel 17 debian-hvm-install/l1/l2 fail REGR. 
> vs. 145025

While da9290639eb5d6ac did fix the vmlaunch error, now the L1 guest
seems to loose interrupts:

[  412.127078] NETDEV WATCHDOG: eth0 (e1000): transmit queue 0 timed out
[  412.151837] ------------[ cut here ]------------
[  412.164281] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:320 
dev_watchdog+0x252/0x260
[  412.185821] Modules linked in: xen_gntalloc ext4 mbcache jbd2 e1000 sym53c8xx
[  412.204399] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.150+ #1
[  412.223988] Hardware name: Xen HVM domU, BIOS 4.14-unstable 12/30/2019
[  412.241657] task: ffffffff82213480 task.stack: ffffffff82200000
[  412.256979] RIP: e030:dev_watchdog+0x252/0x260
[  412.268444] RSP: e02b:ffff88801fc03e90 EFLAGS: 00010286
[  412.281727] RAX: 0000000000000039 RBX: 0000000000000000 RCX: 0000000000000000
[  412.300097] RDX: ffff88801fc1de70 RSI: ffff88801fc16298 RDI: ffff88801fc16298
[  412.318283] RBP: ffff888006c6e41c R08: 000000000001f066 R09: 000000000000023b
[  412.336540] R10: ffff88801fc1a3f0 R11: ffffffff8287d96d R12: ffff888006c6e000
[  412.354643] R13: 0000000000000000 R14: ffff888006e3ac80 R15: 0000000000000001
[  412.373034] FS:  00007fa05293ecc0(0000) GS:ffff88801fc00000(0000) 
knlGS:0000000000000000
[  412.393367] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[  412.408112] CR2: 00007fd80ff16000 CR3: 000000000ce78000 CR4: 0000000000040660
[  412.426338] Call Trace:
[  412.432747]  <IRQ>
[  412.438102]  ? dev_deactivate_queue.constprop.33+0x50/0x50
[  412.451896]  call_timer_fn+0x2b/0x130
[  412.464208]  run_timer_softirq+0x3d8/0x4b0
[  412.474598]  ? handle_irq_event_percpu+0x3c/0x50
[  412.486426]  __do_softirq+0x116/0x2ce
[  412.495883]  irq_exit+0xcd/0xe0
[  412.503999]  xen_evtchn_do_upcall+0x27/0x40
[  412.514626]  xen_do_hypervisor_callback+0x29/0x40
[  412.526684]  </IRQ>
[  412.532252] RIP: e030:xen_hypercall_sched_op+0xa/0x20
[  412.545034] RSP: e02b:ffffffff82203ea0 EFLAGS: 00000246
[  412.558347] RAX: 0000000000000000 RBX: ffffffff82213480 RCX: ffffffff810013aa
[  412.576390] RDX: ffffffff822483e8 RSI: deadbeefdeadf00d RDI: deadbeefdeadf00d
[  412.594580] RBP: 0000000000000000 R08: ffffffffffffffff R09: 0000000000000000
[  412.612831] R10: ffffffff82203e30 R11: 0000000000000246 R12: ffffffff82213480
[  412.630980] R13: 0000000000000000 R14: ffffffff82213480 R15: ffffffff82238e80
[  412.649138]  ? xen_hypercall_sched_op+0xa/0x20
[  412.660671]  ? xen_safe_halt+0xc/0x20
[  412.670177]  ? default_idle+0x23/0x110
[  412.679862]  ? do_idle+0x168/0x1f0
[  412.688666]  ? cpu_startup_entry+0x14/0x20
[  412.699059]  ? start_kernel+0x4c3/0x4cb
[  412.708807]  ? xen_start_kernel+0x527/0x530
[  412.720776] Code: cb e9 a0 fe ff ff 0f 0b 4c 89 e7 c6 05 00 d6 c6 00 01 e8 
82 89 fd ff 89 d9 48 89 c2 4c 89 e6 48 c7 c7 30 fb 01 82 e8 44 e9 a6 ff <0f> 0b 
e9 58 fe ff ff 0f 1f 80 00 00 00 00 41 57 41 56 41 55 41 
[  412.767900] ---[ end trace d9e35c3f725f4b57 ]---
[  412.780193] e1000 0000:00:05.0 eth0: Reset adapter

This only happens when L1 is using x2APIC and a guest has been
launched (by L1). Prior to launching any guest L1 seems to be fully
functional. I'm currently trying to figure out how/when that interrupt
is lost, which I bet it's related to the merging of vmcs between L1
and L2 done in L0.

As a workaround I could disable exposing x2APIC in CPUID when nested
virtualization is enabled on Intel.

Roger.

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