29 Jan
2025
29 Jan
'25
8:15 p.m.
On Wed, Jan 29, 2025 at 06:49:22PM +0100, Eric Auger wrote:
If it was overriden inside iommufd then the user told the kernel what range to use to override it. I don't need to go back and report back to userspace information that it already gave to the kernel..
Looks strange to me because info exposed in sysfs is wrong then. What if someone else relies on this info, either at kernel level through the get_resv_regions callback or from user space.
Nothing else should call get_resv_regions() because VFIO is bound to the device and iommufd owns the domain. We expect some exclusivity here :)
sysfs for sw_msi should be understood as reporting the driver recommendation, not anything to do with the current MSI operation of the device.
Jason