[PATCH] hv: fix msi affinity when device requests all possible CPU's

Jork Loeser Jork.Loeser at microsoft.com
Thu Jun 29 22:08:00 UTC 2017


> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen at networkplumber.org]
> Sent: Wednesday, June 28, 2017 4:22 PM
> To: KY Srinivasan <kys at microsoft.com>; bhelgaas at google.com
> Cc: linux-pci at vger.kernel.org; devel at linuxdriverproject.org; Stephen
> Hemminger <sthemmin at microsoft.com>
> 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


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