On Fri, Nov 08, 2019 at 05:32:48PM +0000, Will Deacon wrote: > On Fri, Nov 08, 2019 at 05:25:09PM +0000, John Garry wrote: > > On 08/11/2019 16:47, Will Deacon wrote: > > > On Fri, Nov 08, 2019 at 04:44:25PM +0000, John Garry wrote: > > > > BTW, it now looks like it was your v1 series I was testing there, on > > > > your > > > > branch iommu/module. It would be helpful to update for ease of testing. > > > > > > Yes, sorry about that. I'll update it now (although I'm not sure it will > > > help with this -- I was going to see what happens with other devices such > > > as the intel-iommu or storage controllers) > > > > So I tried your v2 series for this - it has the same issue, as I > > anticipated. > > Right, I'm just not sure how resilient drivers are expected to be to force > unbinding like this. You can break lots of stuff with root... > > > It seems that some iommu drivers do call iommu_device_register(), so maybe a > > decent reference. Or simply stop the driver being unbound. > > I'm not sure what you mean about iommu_device_register() (we call that > already), but I guess we can keep the '.suppress_bind_attrs = true' if > necessary. I'll have a play on my laptop and see how well that works if > you start unbinding stuff.
So unbinding the nvme driver goes bang: [90139.090158] nvme nvme0: failed to set APST feature (-19) [90141.966780] Aborting journal on device dm-1-8. [90141.967124] Buffer I/O error on dev dm-1, logical block 26247168, lost sync page write [90141.967169] JBD2: Error -5 detected when updating journal superblock for dm-1-8. [90141.967403] Buffer I/O error on dev dm-1, logical block 0, lost sync page write [90141.967454] EXT4-fs (dm-1): I/O error while writing superblock [90141.967467] EXT4-fs error (device dm-1): ext4_journal_check_start:61: Detected aborted journal [90141.967473] EXT4-fs (dm-1): Remounting filesystem read-only [90141.967569] Buffer I/O error on dev dm-1, logical block 0, lost sync page write [90141.967682] EXT4-fs (dm-1): I/O error while writing superblock and I've not managed to recover the thing yet (it's stuck trying to reboot.) What state was your system in after unbinding the SMMU? Will _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
