On 12/15/2012 05:16 PM, Robert Hancock wrote:
On 12/14/2012 03:32 PM, Don Dutile wrote:
On 12/13/2012 04:50 AM, Jason Gao wrote:
Dear List:
Description of problem:
After installed Centos 6.3(RHEL6.3) on my Dell R710(lastest
bios:Version: 6.3.0,Release Date: 07/24/2012) server,and updated
lastest kernel "2.6.32-279.14.1.el6.x86_64",I want to use the Intel
82576 ET Dual Port nic's SR-IOV feature,assigning VFs to kvm guest
appended kernel boot parameter: intel_iommu=on,after boot with the
following messages:
Dec 13 16:58:15 2 kernel: DRHD: handling fault status reg 2
Dec 13 16:58:15 2 kernel: DMAR:[DMA Read] Request device [03:00.0]
fault addr ffe65000
Dec 13 16:58:15 2 kernel: DMAR:[fault reason 06] PTE Read access is
not set
Dec 13 16:58:15 2 kernel: DRHD: handling fault status reg 102
Dec 13 16:58:15 2 kernel: DMAR:[DMA Read] Request device [03:00.0]
fault addr ffe8a000
Dec 13 16:58:15 2 kernel: DMAR:[fault reason 06] PTE Read access is
not set
Dec 13 16:58:15 2 kernel: scsi 0:0:32:0: Enclosure DP
BACKPLANE 1.07 PQ: 0 ANSI: 5
Dec 13 16:58:15 2 kernel: DRHD: handling fault status reg 202
Dec 13 16:58:15 2 kernel: DMAR:[DMA Read] Request device [03:00.0]
fault addr ffe89000
Dec 13 16:58:15 2 kernel: DMAR:[fault reason 06] PTE Read access is
not set
full dmesg detail:
http://pastebin.com/BzFQV0jU
lspci -vvv full detail:
http://pastebin.com/9rP2d1br
it's a production server,and I'm not sure if this is a critical
problem,how to fix it,any help would be greatly appreciated.
DMAR table does not have an entry for this device to this region.
Once the driver reconfigs/resets the device to stop polling bios-boot
cmd rings and use (new) OS (dma-mapped) rings, there's a period of time
during this transition that the hw is babbling away to an area that is no
longer mapped.
Maybe some kind of boot PCI quirk is needed to stop the device DMA activity before enabling the IOMMU?
No, lack of a *proper* RMRR for this device is the source of the problem;
that's why the RMRR's exist -- so this transition state does not cause these
types of problems.
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