[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH V1] libxl/arm: Insert "xen,dev-domid" property to virtio-mmio device node
From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> Use specific binding for the virtio devices for which the restricted memory access using Xen grant mappings need to be enabled. Based on device-tree binding from Linux: Documentation/devicetree/bindings/arm/xen,dev-domid.yaml Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> --- !!! This patch is based on non upstreamed yet “Virtio support for toolstack on Arm” V8 series which is on review now: https://lore.kernel.org/xen-devel/1651598763-12162-1-git-send-email-olekstysh@xxxxxxxxx/ New device-tree binding (commit #5) is a part of solution to restrict memory access under Xen using xen-grant DMA-mapping layer (which is also on review): https://lore.kernel.org/xen-devel/1651947548-4055-1-git-send-email-olekstysh@xxxxxxxxx/ Changes RFC -> V1: - update commit description - rebase according to the recent changes to "libxl: Introduce basic virtio-mmio support on Arm" --- tools/libs/light/libxl_arm.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/tools/libs/light/libxl_arm.c b/tools/libs/light/libxl_arm.c index 37403a2..27ff328 100644 --- a/tools/libs/light/libxl_arm.c +++ b/tools/libs/light/libxl_arm.c @@ -862,7 +862,8 @@ static int make_vpci_node(libxl__gc *gc, void *fdt, static int make_virtio_mmio_node(libxl__gc *gc, void *fdt, - uint64_t base, uint32_t irq) + uint64_t base, uint32_t irq, + uint32_t backend_domid) { int res; gic_interrupt intr; @@ -887,6 +888,14 @@ static int make_virtio_mmio_node(libxl__gc *gc, void *fdt, res = fdt_property(fdt, "dma-coherent", NULL, 0); if (res) return res; + if (backend_domid != LIBXL_TOOLSTACK_DOMID) { + uint32_t domid[1]; + + domid[0] = cpu_to_fdt32(backend_domid); + res = fdt_property(fdt, "xen,dev-domid", domid, sizeof(domid)); + if (res) return res; + } + res = fdt_end_node(fdt); if (res) return res; @@ -1205,7 +1214,8 @@ next_resize: libxl_device_disk *disk = &d_config->disks[i]; if (disk->specification == LIBXL_DISK_SPECIFICATION_VIRTIO) - FDT( make_virtio_mmio_node(gc, fdt, disk->base, disk->irq) ); + FDT( make_virtio_mmio_node(gc, fdt, disk->base, disk->irq, + disk->backend_domid) ); } if (pfdt) -- 2.7.4
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