On Wed, 8 Nov 2017 07:00:23 -0500 Chas Williams <3ch...@gmail.com> wrote:
> On Tue, Nov 7, 2017 at 5:26 PM, Ferruh Yigit <ferruh.yi...@intel.com> wrote: > On 11/7/2017 12:47 PM, Chas Williams wrote: > > I will confess I haven't looked into the issue too hard since I have a > > workaround. My first guess is that there is something going on with the > > IOMMU > > and quiescing a PCI pass-through device/function from the guest (since I > > don't > > think the IOMMU is "visible" to the guest) seems iffy. > > > > Most devices have some sort of reset to put the device into a known state > > for > > setup/configuration (or enable/disable for the DMA engines). If this is > > done at > > .dev_close(), shouldn't that be as sufficient as resetting the function? > > This is for the cases DPDK app terminated unexpectedly, proper exit path > already > does cleanup. > > Call a usermode helper from igb_uio that does an open/close on the device > about to be released? usermode helper is hated by upstream kernel developers. There are many problems such as what namespace and security.
