[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [RFC PATCH] libxl/arm: Insert "xen,dev-domid" property to virtio-mmio device node
From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> This is needed for grant table based DMA ops layer (CONFIG_XEN_VIRTIO) at the guest side to retrieve the ID of Xen domain where the corresponding backend resides (it is used as an argument to the grant table APIs). This is a part of restricted memory access under Xen feature. Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> --- !!! This patch is based on non upstreamed yet “Virtio support for toolstack on Arm” series which is on review now: https://lore.kernel.org/xen-devel/1649442065-8332-1-git-send-email-olekstysh@xxxxxxxxx/ All details are at: https://lore.kernel.org/xen-devel/1649963973-22879-1-git-send-email-olekstysh@xxxxxxxxx/ --- 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 8132a47..d9b26fc 100644 --- a/tools/libs/light/libxl_arm.c +++ b/tools/libs/light/libxl_arm.c @@ -875,7 +875,8 @@ 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; @@ -900,6 +901,14 @@ 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; @@ -1218,7 +1227,8 @@ next_resize: libxl_device_disk *disk = &d_config->disks[i]; if (disk->protocol == LIBXL_DISK_PROTOCOL_VIRTIO_MMIO) - 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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