On 27/02/18 06:21, Tian, Kevin wrote: [...] >> Technically nothing prevents it, but now the resv problem discussed on >> patch 2/37 stands out. For example on x86 you'd probably need to carve >> the >> IOAPIC MSI range out of the process address space. On Arm you'd need to >> create a write-only mapping for MSIs (IOMMU translates it to the IRQ chip >> address, but thankfully accessing the doorbell from CPU side doesn't >> trigger an MSI.) > > so if overlap already exists when binding a process address space > (since binding may happen much later than creating the process), > I assume the call will simply fail since carve out at this point is not > possible? Yes in this case I think it's safer to abort the bind() call Thanks, Jean
