Re: [PATCH] Request backport of a vfio patch for 5.4 stable

On Mon, Jan 11, 2021 at 12:31:27PM -0500, Matthew Rosato wrote:

Upstream commit 7d6e1329652e ("vfio iommu: Add dma available capability") should probably have been identified as a stable candidate originally, as without this available in a KVM host QEMU guests on at least s390x can end up with broken PCI passthrough devices, as the guest is unaware of the vfio DMA limit and can easily overrun it.

The commit in question won't fit cleanly to 5.4, so I've included a proposed backport patch.

Queued up, thanks!