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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 4/6] libxl: Add support for Device Tree passthrough
From: Julien Grall <julien.grall@xxxxxxxxxx>
On ARM, every non-PCI device are described in the device tree. Each of
them can be found via a path.
This patch introduces a very basic support, only the IOMMU will be set
up correctly. The user will have to:
- Describe the device in the partial device tree
- Map manually MMIO/IRQ
This is a first approach, that will allow to have a basic Device Tree
passthrough support in Xen. This could be improved later.
Furthermore add LIBXL_HAVE_DEVICETREE_PASSTHROUGH to indicate we
support Device Tree passthrough and partial device tree (introduced by a
previous patch).
Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Changes in v6:
- Add Ian C. and Ian J.'s ack
Changes in v5:
- Replace some "non-PCI" to "Device Tree"
Changes in v4:
- Add LIBXL_HAVE_DEVICTREE_PASSTHROUGH to indicate we support
non-PCI passthrough. This is also used in order to indicate
partial device tree is supported
- Remove libxl_dtdev.c as it contains only a 2 lines functions
and call directly xc_* from libxl_create.c
- Introduce domcreate_attach_dtdev
Changes in v3:
- Dynamic allocation has been dropped
- Rework the commit message in accordance with the previous
item
Changes in v2:
- Get DT infos earlier
- Allocate/map IRQ in libxl__arch_domain_create rather than in
libxl__device_dt_add
- Use VIRQ rather than the PIRQ to construct the interrupts
properties of the device tree
- Correct cpumask in make_dtdev_node. We allow the interrupt to
be used on the 8 CPUs
- Fix LOGE when we map the MMIO region in the guest in
libxl__device_dt_add. The domain and the IRQ were inverted
- Calculate the number of SPIs to configure the VGIC
- xc_physdev_dtdev_* helpers has been renamed to xc_dtdev_*
- Rename libxl_device_dt to libxl_device_dtdev
---
tools/libxl/libxl.h | 7 +++++++
tools/libxl/libxl_create.c | 32 ++++++++++++++++++++++++++++++++
tools/libxl/libxl_internal.h | 5 +++++
tools/libxl/libxl_types.idl | 5 +++++
4 files changed, 49 insertions(+)
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index efc0617..4aab751 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -192,6 +192,13 @@
* is not present, instead of ERROR_INVAL.
*/
#define LIBXL_HAVE_ERROR_DOMAIN_NOTFOUND 1
+
+/*
+ * libxl_domain_build_info has device_tree and libxl_device_dtdev
+ * exists. This mean Device Tree passthrough is supported for ARM
+ */
+#define LIBXL_HAVE_DEVICETREE_PASSTHROUGH 1
+
/*
* libxl ABI compatibility
*
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index f0da7dc..0a2359e 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -764,6 +764,8 @@ static void domcreate_attach_vtpms(libxl__egc *egc,
libxl__multidev *multidev,
int ret);
static void domcreate_attach_pci(libxl__egc *egc, libxl__multidev *aodevs,
int ret);
+static void domcreate_attach_dtdev(libxl__egc *egc,
+ libxl__domain_create_state *dcs);
static void domcreate_console_available(libxl__egc *egc,
libxl__domain_create_state *dcs);
@@ -1457,6 +1459,36 @@ static void domcreate_attach_pci(libxl__egc *egc,
libxl__multidev *multidev,
}
}
+ domcreate_attach_dtdev(egc, dcs);
+ return;
+
+error_out:
+ assert(ret);
+ domcreate_complete(egc, dcs, ret);
+}
+
+static void domcreate_attach_dtdev(libxl__egc *egc,
+ libxl__domain_create_state *dcs)
+{
+ STATE_AO_GC(dcs->ao);
+ int i;
+ int ret;
+ int domid = dcs->guest_domid;
+
+ /* convenience aliases */
+ libxl_domain_config *const d_config = dcs->guest_config;
+
+ for (i = 0; i < d_config->num_dtdevs; i++) {
+ const libxl_device_dtdev *dtdev = &d_config->dtdevs[i];
+
+ LOG(DEBUG, "Assign device \"%s\" to dom%u", dtdev->path, domid);
+ ret = xc_assign_dt_device(CTX->xch, domid, dtdev->path);
+ if (ret < 0) {
+ LOG(ERROR, "xc_assign_dtdevice failed: %d\n", ret);
+ goto error_out;
+ }
+ }
+
domcreate_console_available(egc, dcs);
domcreate_complete(egc, dcs, 0);
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 857abd4..dcb3f5c 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -1203,6 +1203,11 @@ _hidden int libxl__create_pci_backend(libxl__gc *gc,
uint32_t domid,
libxl_device_pci *pcidev, int num);
_hidden int libxl__device_pci_destroy_all(libxl__gc *gc, uint32_t domid);
+/* from libxl_dtdev */
+
+_hidden int libxl__device_dt_add(libxl__gc *gc, uint32_t domid,
+ const libxl_device_dtdev *dtdev);
+
/*----- xswait: wait for a xenstore node to be suitable -----*/
typedef struct libxl__xswait_state libxl__xswait_state;
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 3254617..8158691 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -541,6 +541,10 @@ libxl_device_pci = Struct("device_pci", [
("seize", bool),
])
+libxl_device_dtdev = Struct("device_dtdev", [
+ ("path", string),
+ ])
+
libxl_device_vtpm = Struct("device_vtpm", [
("backend_domid", libxl_domid),
("backend_domname", string),
@@ -567,6 +571,7 @@ libxl_domain_config = Struct("domain_config", [
("disks", Array(libxl_device_disk, "num_disks")),
("nics", Array(libxl_device_nic, "num_nics")),
("pcidevs", Array(libxl_device_pci, "num_pcidevs")),
+ ("dtdevs", Array(libxl_device_dtdev, "num_dtdevs")),
("vfbs", Array(libxl_device_vfb, "num_vfbs")),
("vkbs", Array(libxl_device_vkb, "num_vkbs")),
("vtpms", Array(libxl_device_vtpm, "num_vtpms")),
--
2.1.4
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