[Xen-devel] Regression in PCI pass-through from qemu-xen changeset "Fix hvm guest cirrus_vga hvm s3 resume failure"

[Simon Horman <horms@xxxxxxxxxxxx>]

Apologies if this has been reported elsewhere.

Changeset "Fix hvm guest cirrus_vga hvm s3 resume failure"
(08251d35eafe5bafff42d226ccd56277014b16e9) in qemu-xen-unstable.git
appears to cause a regression. This changeset was applied
between the xen-3.4.0-rc2 and xen-3.4.0-rc3 tags of qemu-xen-unstable.git.

The problem that I am seeing is that with this changeset applied
I am not able to correctly initialise Intel network cards. Though
I assume the problem is not specific to this hardware.

In the case of an Intel e100 82557/8/9/0/1 the problem manifests as the
EEPROM being declared invalid and the function is completely disabled by
the guest operating system.

In the case of an Intel igb 82576 the card is initialised by the
guest operating system but is unable to establish a link and
ethtool returning invalid values for the supported ports -
it tells me the card has fibre when in fact it has copper.

domU is running x86_32 2.6.30-rc4. dom0 is x86_64.

It is not immediately apparent to me what a fix for this problem
would look like.

-- 
Simon Horman
  VA Linux Systems Japan K.K. Satellite Lab in Sydney, Australia
  H: www.vergenet.net/~horms/            W: www.valinux.co.jp/en


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