Re: Add iommu device when VM configured with > 255 vcpus

2024-05-31 Thread Dario Faggioli via Devel
On Fri, 2024-05-31 at 11:16 +0100, Joao Martins wrote: > On 30/05/2024 18:00, Dario Faggioli via Devel wrote: > > > > IIUIC, it's a matter of number of bits available in the I/O APIC > > IRQ > > destination register. Like, with only that available, and it being &g

Re: Add iommu device when VM configured with > 255 vcpus

2024-05-30 Thread Dario Faggioli via Devel
On Thu, 2024-05-30 at 14:45 +0200, Igor Mammedov wrote: > Usability of huge VMs (incl. large amount of vCPUs) heavily depends > on used guest OS. What would work for one might not work for other. > For general purpose OS adding IOMMU is typically necessary to make > vCPUs over 254 usable, for Windo