On Thu, 6 Feb 2025 14:14:28 +0100 Cédric Le Goater <c...@redhat.com> wrote:
> MIME-Version: 1.0 > Content-Type: text/plain; charset=UTF-8 > Content-Transfer-Encoding: 8bit > > Hello, > > Under certain circumstances, a MMIO region of a device fails to map > because the region is outside the supported IOVA ranges of the VM. In > this case, PCI peer-to-peer transactions on BARs are not supported. > This typically occurs when the IOMMU address space width is less than > the physical address width, as can be the case on some Intel consumer > processors or when using a vIOMMU device with default settings. > > This series tries to clarify the error message reported to the user. > > Thanks, > > C. > > Changes in v3: > > - Fixed warn_report_err_once() > - Improved commit logs a bit > - Dropped check on compatibility of CPU and IOMMU address space > width. Will address later in its own series. > > Changes in v2: > > - Removed advice on how to resolve the issue. Diagnostic is enough. > - Introduced helpers > - Checked device type, since this only applies to PCI > - Added cleanup > > Cédric Le Goater (7): > util/error: Introduce warn_report_err_once() > vfio/pci: Replace "iommu_device" by "vIOMMU" > vfio: Rephrase comment in vfio_listener_region_add() error path > vfio: Introduce vfio_get_vfio_device() > vfio: Improve error reporting when MMIO region mapping fails > vfio: Remove reports of DMA mapping errors in backends > vfio: Remove superfluous error report in vfio_listener_region_add() > > include/hw/vfio/vfio-common.h | 1 + > include/qapi/error.h | 12 +++++++++++ > backends/iommufd.c | 3 --- > hw/vfio/common.c | 40 +++++++++++++++++++++++++---------- > hw/vfio/container.c | 2 -- > hw/vfio/helpers.c | 10 +++++++++ > hw/vfio/pci.c | 2 +- > util/error.c | 11 ++++++++++ > 8 files changed, 64 insertions(+), 17 deletions(-) > Reviewed-by: Alex Williamson <alex.william...@redhat.com>
