From: David Ahern <daahern@cisco.com>
To: "Rose, Gregory V" <gregory.v.rose@intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: VFs go missing with latest kernel
Date: Tue, 31 Jan 2012 16:05:00 -0700 [thread overview]
Message-ID: <4F28739C.1040907@cisco.com> (raw)
In-Reply-To: <C5551D9AAB213A418B7FD5E4A6F30A0702F6489B@ORSMSX106.amr.corp.intel.com>
On 01/31/2012 03:58 PM, Rose, Gregory V wrote:
>> Note that all of the even numbered VFs have disappeared. Accordingly,
>> trying to launch the VM to which the VFs are assigned fails. git bisect
>> pointed to this commit:
>>
>> 0224d663063d542b3d829706f3fcbd0f640f19b3 is the first bad commit
>> commit 0224d663063d542b3d829706f3fcbd0f640f19b3
>> Author: Greg Rose <gregory.v.rose@intel.com>
>> Date: Fri Oct 14 02:57:14 2011 +0000
>>
>> igb: Check if subordinate VFs are assigned to virtual machines
>>
>> Kvm and the Xen pci-back driver will set a flag in the virtual
>> function
>> pci device dev_flags when the VF is assigned to a guest VM. Before
>> destroying subordinate VFs check to see if the flag is set and if so
>> skip the call to pci_disable_sriov() to avoid system crashes.
>>
>> Copy the maintainer for the Xen pci-back driver. Also CC'ing
>> maintainers of all drivers found to call pci_disable_sriov().
>>
>>
>> Sure enough reverting the patch on 3.3.0-rc1 makes the VFs visible again.
>>
>> I am hitting some other problem trying to use the VF on 3.3.0-rc1 -- KVM
>> fails the KVM_CAP_IOMMU check though the server has one (works fine with
>> the older kernel) and it is built into the kernel. Debugging that
>> problem now.
>
> I'll see if I can reproduce that. Is this all after a fresh boot with no unloading/reloading of the PF driver?
Build kernel, reboot, run lspci - note missing VFs.
next prev parent reply other threads:[~2012-01-31 23:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-31 22:53 VFs go missing with latest kernel David Ahern
2012-01-31 22:58 ` Rose, Gregory V
2012-01-31 23:05 ` David Ahern [this message]
2012-01-31 23:07 ` Rose, Gregory V
2012-02-01 0:30 ` David Ahern
2012-02-01 0:43 ` Rose, Gregory V
2012-02-01 0:50 ` David Ahern
2012-02-01 1:03 ` Rose, Gregory V
2012-02-01 17:47 ` Rose, Gregory V
2012-02-01 17:57 ` David Ahern
2012-02-01 18:02 ` Rose, Gregory V
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