From: Cédric Le Goater Date: Thu, 6 Feb 2025 13:14:34 +0000 (+0100) Subject: vfio: Remove reports of DMA mapping errors in backends X-Git-Tag: v10.0.0-rc0~56^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=889695f8f3c10647cc27a3788b4a3f1d0192926c;p=thirdparty%2Fqemu.git vfio: Remove reports of DMA mapping errors in backends Currently, the mapping handlers of the IOMMU backends, VFIO IOMMU Type 1 aka. legacy and IOMMUFD, return an errno and also report an error. This can lead to excessive log messages at runtime for recurring DMA mapping errors. Since these errors are already reported by the callers in the vfio_container_dma_un/map() routines, simply remove them and allow the callers to handle the reporting. The mapping handler of the IOMMUFD backend has a comment suggesting MMIO region mapping failures return EFAULT. I am not sure this is entirely true, so keep the EFAULT case until the conditions are clarified. Reviewed-by: Alex Williamson Link: https://lore.kernel.org/qemu-devel/20250206131438.1505542-7-clg@redhat.com Signed-off-by: Cédric Le Goater --- diff --git a/backends/iommufd.c b/backends/iommufd.c index 7b4fc8ec46..d57da44755 100644 --- a/backends/iommufd.c +++ b/backends/iommufd.c @@ -167,8 +167,6 @@ int iommufd_backend_map_dma(IOMMUFDBackend *be, uint32_t ioas_id, hwaddr iova, /* TODO: Not support mapping hardware PCI BAR region for now. */ if (errno == EFAULT) { warn_report("IOMMU_IOAS_MAP failed: %m, PCI BAR?"); - } else { - error_report("IOMMU_IOAS_MAP failed: %m"); } } return ret; @@ -203,7 +201,6 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id, if (ret) { ret = -errno; - error_report("IOMMU_IOAS_UNMAP failed: %m"); } return ret; } diff --git a/hw/vfio/container.c b/hw/vfio/container.c index 4ebb526808..7c57bdd27b 100644 --- a/hw/vfio/container.c +++ b/hw/vfio/container.c @@ -159,7 +159,6 @@ static int vfio_legacy_dma_unmap(const VFIOContainerBase *bcontainer, unmap.size -= 1ULL << ctz64(bcontainer->pgsizes); continue; } - error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno)); return -errno; } @@ -204,7 +203,6 @@ static int vfio_legacy_dma_map(const VFIOContainerBase *bcontainer, hwaddr iova, return 0; } - error_report("VFIO_MAP_DMA failed: %s", strerror(errno)); return -errno; }