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* Problems with APIC on versions 4.9 and later (4.8 works)
@ 2021-01-18 20:15 Claudemir Todo Bom
  2021-01-19  9:07 ` Jan Beulich
  0 siblings, 1 reply; 26+ messages in thread
From: Claudemir Todo Bom @ 2021-01-18 20:15 UTC (permalink / raw)
  To: xen-users, xen-devel

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Hi,

Sorry for the simultaneous post on xen-users and xen-devel, but as I noted
that the problem appears only for versions of xen that are >= 4.9, I think
that developers may have a look at this.

I recently bought a generic mainboard and a Xeon E5-2926v2 CPU, it is a 12
core, 24 threads cpu.

My system was already running on another machine with xen 4.11 on a debian
10 system and after replacing the mainboard it didn't boot.

After many tries I noticed that downgrading to the previous version of Xen
(4.8, available on Debian 9) works well. I also tried a lot of variations
for the dom0 kernel, all of them with the same results.

All my tests were done with 4.11, but I checked with a live version of
Alpine Linux (3.7.3, with Xen 4.9.4) that the system doesn't boot on that
release also.

With more research I noticed that if I limit dom0 to use only one CPU
(dom0_max_vcpus=1) the system boots up, I didn't check if guest VM worked,
but I suppose that they would not be able to use the other 23 vcpus
available, anyway, a system with one vcpu for dom0 would be very slow I
think.

I've noticed also that if I keep dom0 to use more than one core but disable
acpi on the dom0 kernel, it boots up, unfortunately this is not
sufficient because I cannot use any device attached to the system (not even
the usb keyboard). This only helps to detect that the problem may be in the
ACPI/APIC code.

I tried many variations with parameters related with ACPI and APIC. None of
them was satisfactory, always ended on a halted system or a self rebooting
one.

Can anyone point me to a solution for this?

Best regards,
Claudemir

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^ permalink raw reply	[flat|nested] 26+ messages in thread

end of thread, other threads:[~2021-02-01 16:48 UTC | newest]

Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-18 20:15 Problems with APIC on versions 4.9 and later (4.8 works) Claudemir Todo Bom
2021-01-19  9:07 ` Jan Beulich
2021-01-19 19:47   ` Claudemir Todo Bom
     [not found]   ` <CANyqHYcifnCgd5C5vbYoi4CTtoMX5+jzGqHfs6JZ+e=d2Y_dmg@mail.gmail.com>
2021-01-20  8:50     ` Jan Beulich
2021-01-20 15:13       ` Jürgen Groß
2021-01-20 20:13         ` Claudemir Todo Bom
2021-01-21  7:59           ` Jan Beulich
2021-01-22 12:55         ` Claudemir Todo Bom
2021-01-22 23:36         ` Claudemir Todo Bom
2021-01-25  9:38           ` Jan Beulich
2021-01-25 19:37             ` Claudemir Todo Bom
2021-01-26 11:48               ` Jan Beulich
2021-01-27 12:25                 ` Claudemir Todo Bom
     [not found]                 ` <CANyqHYeDR_NUKzPtbfLiUzxAUzerKepbU4B-_6=U-7Y6uy8gpQ@mail.gmail.com>
2021-01-28  9:47                   ` Jan Beulich
2021-01-28  9:49                     ` Jan Beulich
2021-01-28 13:08                       ` Claudemir Todo Bom
2021-01-29 14:21                         ` Jan Beulich
2021-01-29 15:07                           ` Claudemir Todo Bom
2021-01-29 16:24                         ` Jan Beulich
2021-01-29 19:31                           ` Claudemir Todo Bom
2021-02-01  7:51                             ` Jan Beulich
2021-02-01 12:47                             ` Jan Beulich
2021-02-01 14:46                               ` Claudemir Todo Bom
2021-02-01 15:09                                 ` Jan Beulich
2021-02-01 15:26                                   ` Claudemir Todo Bom
2021-02-01 16:48                                     ` Jan Beulich

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