diff options
Diffstat (limited to 'hw/vfio/spapr.c')
| -rw-r--r-- | hw/vfio/spapr.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/hw/vfio/spapr.c b/hw/vfio/spapr.c index 259397c002..becf71a3fc 100644 --- a/hw/vfio/spapr.c +++ b/hw/vfio/spapr.c @@ -15,6 +15,7 @@ #include "hw/vfio/vfio-common.h" #include "hw/hw.h" +#include "exec/ram_addr.h" #include "qemu/error-report.h" #include "trace.h" @@ -144,9 +145,27 @@ int vfio_spapr_create_window(VFIOContainer *container, { int ret; IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); - unsigned pagesize = memory_region_iommu_get_min_page_size(iommu_mr); + uint64_t pagesize = memory_region_iommu_get_min_page_size(iommu_mr); unsigned entries, pages; struct vfio_iommu_spapr_tce_create create = { .argsz = sizeof(create) }; + long systempagesize = qemu_getrampagesize(); + + /* + * The host might not support the guest supported IOMMU page size, + * so we will use smaller physical IOMMU pages to back them. + */ + if (pagesize > systempagesize) { + pagesize = systempagesize; + } + pagesize = 1ULL << (63 - clz64(container->pgsizes & + (pagesize | (pagesize - 1)))); + if (!pagesize) { + error_report("Host doesn't support page size 0x%"PRIx64 + ", the supported mask is 0x%lx", + memory_region_iommu_get_min_page_size(iommu_mr), + container->pgsizes); + return -EINVAL; + } /* * FIXME: For VFIO iommu types which have KVM acceleration to |