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Thu, 14 Apr 2022 12:36:02 -0700 (PDT) From: Oleksandr Tyshchenko To: xen-devel@lists.xenproject.org Cc: Oleksandr Tyshchenko , Wei Liu , Anthony PERARD , Juergen Gross , Stefano Stabellini , Julien Grall , Bertrand Marquis , Wei Chen , Henry Wang , Kaly Xin , Jiamei Xie , =?UTF-8?q?Alex=20Benn=C3=A9e?= Subject: [RFC PATCH] libxl/arm: Insert "xen,dev-domid" property to virtio-mmio device node Date: Thu, 14 Apr 2022 22:36:00 +0300 Message-Id: <1649964960-24864-1-git-send-email-olekstysh@gmail.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1649964994116100001 From: Oleksandr Tyshchenko 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 --- !!! This patch is based on non upstreamed yet =E2=80=9CVirtio support for t= oolstack on Arm=E2=80=9D series which is on review now: https://lore.kernel.org/xen-devel/1649442065-8332-1-git-send-email-olekstys= h@gmail.com/ All details are at: https://lore.kernel.org/xen-devel/1649963973-22879-1-git-send-email-oleksty= sh@gmail.com/ --- 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, =20 =20 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 =3D fdt_property(fdt, "dma-coherent", NULL, 0); if (res) return res; =20 + if (backend_domid !=3D LIBXL_TOOLSTACK_DOMID) { + uint32_t domid[1]; + + domid[0] =3D cpu_to_fdt32(backend_domid); + res =3D fdt_property(fdt, "xen,dev-domid", domid, sizeof(domid)); + if (res) return res; + } + res =3D fdt_end_node(fdt); if (res) return res; =20 @@ -1218,7 +1227,8 @@ next_resize: libxl_device_disk *disk =3D &d_config->disks[i]; =20 if (disk->protocol =3D=3D 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) ); } =20 if (pfdt) --=20 2.7.4