On Mon, May 11, 2026 at 4:48 PM Vipin Sharma <[email protected]> wrote:
> diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig > index c12d614fc6c4..019de053f116 100644 > --- a/drivers/vfio/pci/Kconfig > +++ b/drivers/vfio/pci/Kconfig > @@ -45,13 +45,15 @@ config VFIO_PCI_IGD > > config VFIO_PCI_LIVEUPDATE > bool "VFIO PCI support for Live Update (EXPERIMENTAL)" > - depends on PCI_LIVEUPDATE > + depends on PCI_LIVEUPDATE && VFIO_DEVICE_CDEV > help > Support for preserving devices bound to vfio-pci across a Live > Update. This option should only be enabled by developers working on > implementing this support. Once enough support has landed in the > kernel, this option will no longer be marked EXPERIMENTAL. > > + Enabling this will disable support for VFIO PCI DMA buffer. > + > If you don't know what to do here, say N. > > endif > @@ -68,7 +70,7 @@ config VFIO_PCI_ZDEV_KVM > To enable s390x KVM vfio-pci extensions, say Y. > > config VFIO_PCI_DMABUF > - def_bool y if VFIO_PCI_CORE && PCI_P2PDMA && DMA_SHARED_BUFFER > + def_bool y if VFIO_PCI_CORE && PCI_P2PDMA && DMA_SHARED_BUFFER && > !VFIO_PCI_LIVEUPDATE Why does enabling VFIO_PCI_LIVEUPDATE require disabling VFIO_PCI_DMABUF? I saw the cover letter says "to keep things simple", but what specific problem does this solve or simplify?
