Hi Vipin, On Mon, 16 Mar 2026 09:28:32 -0700 Vipin Sharma <[email protected]> wrote:
> On Fri, Mar 13, 2026 at 08:39:18AM -0700, Jacob Pan wrote: > > Hi David, > > > > > +config VFIO_PCI_LIVEUPDATE > > > + bool "VFIO PCI support for Live Update (EXPERIMENTAL)" > > > + depends on LIVEUPDATE && VFIO_PCI > > > + help > > > + Support for preserving devices bound to vfio-pci across > > > a Live > > > + Update. The eventual goal is that preserved devices can > > > run > > > + uninterrupted during a Live Update, including DMA to > > > preserved > > > + memory buffers and P2P. However there are many steps > > > still needed to > > > + achieve this, including: > > > + > > > + - Preservation of iommufd files > > > + - Preservation of IOMMU driver state > > In the interim, what do you think about moving forward with noiommu > > mode without preserving IOMMU driver state? I’ve tested your > > vfio_pci_liveupdate_kexec_test with the noiommu cdev, and it works > > as expected. > > > > Just curious, are you using qemu VM without iommu device for noiommu > work or do you have actual system without iommu hardware for testing? I am using a qemu VM without iommu device and with an assigned nvme device. I use a low level nvme userspace driver (modified to use iommufd noiommu mode) for testing. https://github.com/SamsungDS/libvfn
