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Re: [BUG] x2apic broken with current AMD hardware
- To: Elliott Mitchell <ehem+xen@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 8 Mar 2023 15:37:02 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08/03/2023 3:23 pm, Elliott Mitchell wrote:
> Mostly SSIA. As originally identified by "Neowutran", appears Xen's
> x2apic wrapper implementation fails with current generation AMD hardware
> (Ryzen 7xxx/Zen 4). This can be worked around by passing "x2apic=false"
> on Xen's command-line, though I'm wondering about the performance impact.
>
> There hasn't been much activity on xen-devel WRT x2apic, so a patch which
> fixed this may have flown under the radar. Most testing has also been
> somewhat removed from HEAD.
>
> Thanks to "Neowutran" for falling on this grenade and making it easier
> for the followers. Pointer to first report:
> https://forum.qubes-os.org/t/ryzen-7000-serie/14538
I'm sorry, but this is unactionable.
That thread is a mess of many different bugs, most entirely unrelated to
Xen in the slightest, and there is conflicting information on whether
the x2apic=false heuristic is even relevant.
There may be a Xen issue hiding in there, but my divination skill level
is unequal to the task...
~Andrew
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