Re: Xen 4.2.0-rc4 bugs with GigaByte H77M-D3H + Core i7 3770

[Javier Marcet <jmarcet@gmail.com>]

On Fri, Aug 31, 2012 at 1:09 PM, Jan Beulich <JBeulich@suse.com> wrote:

> > [    0.358278] DMAR:[DMA Read] Request device [00:02.0] fault addr
> > 9fac7000
> > [    0.358278] DMAR:[fault reason 06] PTE Read access is not set
> > [    0.358286] DRHD: handling fault status reg 2
> > [    0.358288] DMAR:[DMA Read] Request device [00:02.0] fault addr
> > 9fac7000
> > [    0.358288] DMAR:[fault reason 06] PTE Read access is not set
> > [    0.358291] DMAR:[DMA Read] Request device [00:02.0] fault addr
> > 9fac7000
> > [    0.358291] DMAR:[fault reason 06] PTE Read access is not set
> > [    0.358307] DRHD: handling fault status reg 3
> >
> > Furthermore, later on, just after enabling the IOMMU, I get this:
> >
> > [    0.328564] DMAR: No ATSR found
> > [    0.328580] IOMMU 1 0xfed91000: using Queued invalidation
> > [    0.328582] IOMMU: Setting RMRR:
> > [    0.328589] IOMMU: Setting identity map for device 0000:00:1d.0
> > [0x9de36000 - 0x9de52fff]
> > [    0.328606] IOMMU: Setting identity map for device 0000:00:1a.0
> > [0x9de36000 - 0x9de52fff]
> > [    0.328617] IOMMU: Setting identity map for device 0000:00:14.0
> > [0x9de36000 - 0x9de52fff]
> > [    0.328625] IOMMU: Prepare 0-16MiB unity mapping for LPC
> > [    0.328630] IOMMU: Setting identity map for device 0000:00:1f.0
> > [0x0 - 0xffffff]
>
> All of these messages shouldn't appear when running under Xen,
> as it's the hypervisor, not the kernel to take care of the IOMMU(s).
> The logs you had pointers to confirm this - are you sure the above
> was seen when running under Xen?

I'm sorry I didn't make myself clearer. That dmesg output is when booting
WITHOUT xen, that is, linux directly over the bare hardware. Under xen
those errors dissapear.

The big issue I'm having running xen is that I can't use it since xen can't
get the cpu capabilities. On the same kernel, which also has kvm compiled in,
it works fine (kvm).

All the backend xen devices are built-in in the kernel. Frontend devices are
compiled as modules.


--
Javier Marcet <jmarcet@gmail.com>