** Changed in: linux-azure (Ubuntu Eoan)
Status: In Progress => Fix Committed
** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1867220
Title:
Assignment of VDEV Somtimes Fails using Intel QAT
Status in linux-azure package in Ubuntu:
New
Status in linux-azure-4.15 package in Ubuntu:
New
Status in linux-azure source package in Bionic:
Invalid
Status in linux-azure-4.15 source package in Bionic:
Fix Committed
Status in linux-azure source package in Eoan:
Fix Committed
Status in linux-azure-4.15 source package in Eoan:
Invalid
Bug description:
The QAT is a PCIe device which supports SR-IOV. It is used to
accelerate the crypto and compression operations by hardware.
There is additional info for this hardware on the Intel website:
https://www.intel.com/content/www/us/en/products/docs/network-io/ethernet/10-25-40-gigabit-adapters/quickassist-adapter-for-servers.html
https://01.org/intel-quick-assist-technology
On Ubuntu, when the QAT device is enabled with SR-IOV, one device will have
16 VFs.
When we assign the VDEV to Linux VM, sometimes, it will fail but sometimes it
will not.
This issue was debugged and is resolved by applying three patches and
removing some buggy code that was added as SAUCE. The following three patches
are needed:
f73f8a504e27 PCI: hv: Use bytes 4 and 5 from instance ID as the PCI domain
numbers
be700103efd1 PCI: hv: Detect and fix Hyper-V PCI domain number collision
6ae91579061c PCI: hv: Add __aligned(8) to struct retarget_msi_interrupt
Also, revert the patch Revert "PCI: hv: Make sure the bus domain is really
unique", i.e. the line "if (list_empty(&hbus->children)) hbus->sysdata.domain =
desc->ser" in new_pcichild_device() should be completely removed.
The patch “UBUNTU: SAUCE: pci-hyperv: Use only 16 bit integer for PCI
domai” is also pointless now.
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