> From: Jason Gunthorpe <jgg@xxxxxxxxxx> > Sent: Monday, December 4, 2023 11:08 PM > > On Sat, Dec 02, 2023 at 05:12:11PM +0800, Yan Zhao wrote: > > - How to map MSI page on arm platform demands discussions. > > Yes, the recurring problem :( > > Probably the same approach as nesting would work for a hack - map the > ITS page into the fixed reserved slot and tell the guest not to touch > it and to identity map it. > yes logically it should follow what is planned for nesting. just that kvm needs to involve more iommu specific knowledge e.g. iommu_get_msi_cookie() to reserve the slot.
