From: Jan Kiszka <jan.kiszka@web.de>
To: Stefan Hajnoczi <stefanha@gmail.com>, kvm <kvm@vger.kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Michael Tokarev <mjt@tls.msk.ru>,
Eduardo Habkost <ehabkost@redhat.com>
Subject: Re: x2apic issues with Solaris and Xen guests
Date: Mon, 20 Apr 2015 19:29:24 +0200 [thread overview]
Message-ID: <55353774.6070408@web.de> (raw)
In-Reply-To: <CAJSP0QWNqFMfbe_3eCt2nYFmmGcQr80jA_x8nm+hyeZjaYx93w@mail.gmail.com>
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On 2015-04-20 19:07, Stefan Hajnoczi wrote:
> I wonder whether the following two x2apic issues are related:
>
> Solaris 10 U11 network doesn't work
> https://bugzilla.redhat.com/show_bug.cgi?id=1040500
>
> kvm - fails to setup timer interrupt via io-apic
> (Thanks to Michael Tokarev for posting this link)
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=528077#68
>
> It seems KVM's x2apic emulation works with regular Linux and Windows
> guests, but not necessarily with other OSes.
KVM's x2apic is kind of paravirtual - without VT-d interrupt remapping.
That may confuse the guest, though it should work. But Xen already
refuses to pick it according to the second report:
| (XEN) Not enabling x2APIC: depends on iommu_supports_eim.
>
> Has anyone looked into this?
Not yet. Is there a handy reproduction guest image? Or maybe someone
would like to start with tracing what the guest and the host do.
Jan
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next prev parent reply other threads:[~2015-04-20 17:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-20 17:07 x2apic issues with Solaris and Xen guests Stefan Hajnoczi
2015-04-20 17:29 ` Jan Kiszka [this message]
2015-04-20 18:05 ` Michael Tokarev
2015-04-20 18:30 ` Bandan Das
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