Patch still needed for 4.12 -----Original Message----- From: Jork Loeser Sent: Thursday, June 29, 2017 3:08 PM To: stephen@xxxxxxxxxxxxxxxxxx; KY Srinivasan <kys@xxxxxxxxxxxxx>; bhelgaas@xxxxxxxxxx Cc: linux-pci@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> Subject: RE: [PATCH] hv: fix msi affinity when device requests all possible CPU's > -----Original Message----- > From: Stephen Hemminger [mailto:stephen@xxxxxxxxxxxxxxxxxx] > Sent: Wednesday, June 28, 2017 4:22 PM > To: KY Srinivasan <kys@xxxxxxxxxxxxx>; bhelgaas@xxxxxxxxxx > Cc: linux-pci@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; Stephen > Hemminger <sthemmin@xxxxxxxxxxxxx> > Subject: [PATCH] hv: fix msi affinity when device requests all possible CPU's > > When Intel 10G (ixgbevf) is passed to a Hyper-V guest with SR-IOV, the driver > requests affinity with all possible CPU's (0-239) even those CPU's are not online > (and will never be). Because of this the device is unable to correctly get MSI > interrupt's setup. > > This was caused by the change in 4.12 that converted this affinity into all > possible CPU's (0-31) but then host reports an error since this is larger than the > number of online cpu's. > > Previously, this worked (up to 4.12-rc1) because only online cpu's would be put > in mask passed to the host. > > This patch applies only to 4.12. > The driver in linux-next needs a a different fix because of the changes to PCI > host protocol version. The vPCI patch in linux-next has the issue fixed already. Regards, Jork
