Commits
Gavin Shan committed 11e42532ada
PCI: Assume all Mellanox devices have broken INTx masking The VFIO driver routes LSI interrupts by capturing, masking, and then delivering. When passing though Mellanox adapters from host to guest, interrupt storm are reported from host and guest. That's because the PCI command register INTx Disable bit doesn't work on Mellanox devices. # lspci | grep Mellanox 0001:05:00.0 Ethernet controller: Mellanox Technologies MT27500 Family [ConnectX-3] 0005:01:00.0 Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0) Amir Vadai confirmed that all Mellanox devices have same problem. The patch marks broken INTx masking for all Mellanox adapters. Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-By: Amir Vadai <amirv@mellanox.com>