> -----Original Message----- > From: Tian, Kevin [mailto:[email protected]] > Sent: Thursday, March 18, 2021 4:27 PM > To: Longpeng (Mike, Cloud Infrastructure Service Product Dept.) > <[email protected]>; Nadav Amit <[email protected]> > Cc: chenjiashang <[email protected]>; David Woodhouse > <[email protected]>; [email protected]; LKML > <[email protected]>; [email protected]; Gonglei (Arei) > <[email protected]>; [email protected] > Subject: RE: A problem of Intel IOMMU hardware ？ > > > From: iommu <[email protected]> On Behalf Of > > Longpeng (Mike, Cloud Infrastructure Service Product Dept.) > > > > > 2. Consider ensuring that the problem is not somehow related to > > > queued invalidations. Try to use __iommu_flush_iotlb() instead of > qi_flush_iotlb(). > > > > > > > I tried to force to use __iommu_flush_iotlb(), but maybe something > > wrong, the system crashed, so I prefer to lower the priority of this > > operation. > > > > The VT-d spec clearly says that register-based invalidation can be used only > when > queued-invalidations are not enabled. Intel-IOMMU driver doesn't provide an > option to disable queued-invalidation though, when the hardware is capable. > If you > really want to try, tweak the code in intel_iommu_init_qi. >
Hi Kevin, Thanks to point out this. Do you have any ideas about this problem ? I tried to descript the problem much clear in my reply to Alex, hope you could have a look if you're interested. > Thanks > Kevin
