In case the IOMMU translates MSI, MSI IOVA will need to be transparently allocated by the kernel in unused GPA space. Let's initialize a DMA domain where some slots will be reserved "unmanaged" slots and rest is left available for IOVA allocation.
Signed-off-by: Eric Auger <[email protected]> --- drivers/vfio/vfio_iommu_type1.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 2ba1942..ad08fd0 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -36,6 +36,7 @@ #include <linux/uaccess.h> #include <linux/vfio.h> #include <linux/workqueue.h> +#include <linux/dma-iommu.h> #define DRIVER_VERSION "0.2" #define DRIVER_AUTHOR "Alex Williamson <[email protected]>" @@ -829,6 +830,11 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, vfio_test_domain_fgsp(domain); + /* sets the IOVA window */ + if (iommu_capable(bus, IOMMU_CAP_TRANSLATE_MSI) && + iommu_get_dma_msi_region_cookie(domain->domain, 0, ULONG_MAX)) + goto out_detach; + /* replay mappings on new domains */ ret = vfio_iommu_replay(iommu, domain); if (ret) -- 1.9.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
