From 02d552627c2b2b4e8874ff9b6e9a47b728964c18 Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Mon, 14 Feb 2022 03:19:48 +0000 Subject: [PATCH] xen/arm: Allow device-passthrough even the IOMMU is off At the moment, we are only supporting device-passthrough when Xen has enabled the IOMMU. There are some use cases where it is not possible to use the IOMMU (e.g. doesn't exist, hardware limitation, performance) yet it would be OK to assign a device to trusted domain so long they are direct-mapped or the device doesn't do DMA. Note that when the IOMMU is disabled, it will be necessary to add xen,force-assign-without-iommu for every device that needs to be assigned. Signed-off-by: Stefano Stabellini Signed-off-by: Penny Zheng Tested-by: Stefano Stabellini Acked-by: Julien Grall --- xen/arch/arm/domain_build.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index 6467e8ee32..c1e8c99f64 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -3047,7 +3047,8 @@ void __init create_domUs(void) panic("Missing property 'cpus' for domain %s\n", dt_node_name(node)); - if ( dt_find_compatible_node(node, NULL, "multiboot,device-tree") ) + if ( dt_find_compatible_node(node, NULL, "multiboot,device-tree") && + iommu_enabled ) d_cfg.flags |= XEN_DOMCTL_CDF_iommu; if ( !dt_property_read_u32(node, "nr_spis", &d_cfg.arch.nr_spis) ) -- 2.30.2