#include "libxl_internal.h"
#include "libxl_arch.h"
+#include "libxl_libfdt_compat.h"
#include <xc_dom.h>
#include <stdbool.h>
}
}
+#ifdef ENABLE_PARTIAL_DEVICE_TREE
+
+static int check_partial_fdt(libxl__gc *gc, void *fdt, size_t size)
+{
+ int r;
+
+ if (fdt_magic(fdt) != FDT_MAGIC) {
+ LOG(ERROR, "Partial FDT is not a valid Flat Device Tree");
+ return ERROR_FAIL;
+ }
+
+ r = fdt_check_header(fdt);
+ if (r) {
+ LOG(ERROR, "Failed to check the partial FDT (%d)", r);
+ return ERROR_FAIL;
+ }
+
+ if (fdt_totalsize(fdt) > size) {
+ LOG(ERROR, "Partial FDT totalsize is too big");
+ return ERROR_FAIL;
+ }
+
+ return 0;
+}
+
+static int copy_properties(libxl__gc *gc, void *fdt, void *pfdt,
+ int nodeoff)
+{
+ int propoff, nameoff, r;
+ const struct fdt_property *prop;
+
+ for (propoff = fdt_first_property_offset(pfdt, nodeoff);
+ propoff >= 0;
+ propoff = fdt_next_property_offset(pfdt, propoff)) {
+
+ if (!(prop = fdt_get_property_by_offset(pfdt, propoff, NULL))) {
+ return -FDT_ERR_INTERNAL;
+ }
+
+ nameoff = fdt32_to_cpu(prop->nameoff);
+ r = fdt_property(fdt, fdt_string(pfdt, nameoff),
+ prop->data, fdt32_to_cpu(prop->len));
+ if (r) return r;
+ }
+
+ /* FDT_ERR_NOTFOUND => There is no more properties for this node */
+ return (propoff != -FDT_ERR_NOTFOUND)? propoff : 0;
+}
+
+/* Copy a node from the partial device tree to the guest device tree */
+static int copy_node(libxl__gc *gc, void *fdt, void *pfdt,
+ int nodeoff, int depth)
+{
+ int r;
+
+ r = fdt_begin_node(fdt, fdt_get_name(pfdt, nodeoff, NULL));
+ if (r) return r;
+
+ r = copy_properties(gc, fdt, pfdt, nodeoff);
+ if (r) return r;
+
+ for (nodeoff = fdt_first_subnode(pfdt, nodeoff);
+ nodeoff >= 0;
+ nodeoff = fdt_next_subnode(pfdt, nodeoff)) {
+ r = copy_node(gc, fdt, pfdt, nodeoff, depth + 1);
+ if (r) return r;
+ }
+
+ if (nodeoff != -FDT_ERR_NOTFOUND)
+ return nodeoff;
+
+ r = fdt_end_node(fdt);
+ if (r) return r;
+
+ return 0;
+}
+
+static int copy_node_by_path(libxl__gc *gc, const char *path,
+ void *fdt, void *pfdt)
+{
+ int nodeoff, r;
+ const char *name = strrchr(path, '/');
+
+ if (!name)
+ return -FDT_ERR_INTERNAL;
+
+ name++;
+
+ /*
+ * The FDT function to look at a node doesn't take into account the
+ * unit (i.e anything after @) when search by name. Check if the
+ * name exactly matches.
+ */
+ nodeoff = fdt_path_offset(pfdt, path);
+ if (nodeoff < 0)
+ return nodeoff;
+
+ if (strcmp(fdt_get_name(pfdt, nodeoff, NULL), name))
+ return -FDT_ERR_NOTFOUND;
+
+ r = copy_node(gc, fdt, pfdt, nodeoff, 0);
+ if (r) return r;
+
+ return 0;
+}
+
+/*
+ * The partial device tree is not copied entirely. Only the relevant bits are
+ * copied to the guest device tree:
+ * - /passthrough node
+ * - /aliases node
+ */
+static int copy_partial_fdt(libxl__gc *gc, void *fdt, void *pfdt)
+{
+ int r;
+
+ r = copy_node_by_path(gc, "/passthrough", fdt, pfdt);
+ if (r < 0) {
+ LOG(ERROR, "Can't copy the node \"/passthrough\" from the partial FDT");
+ return r;
+ }
+
+ r = copy_node_by_path(gc, "/aliases", fdt, pfdt);
+ if (r < 0 && r != -FDT_ERR_NOTFOUND) {
+ LOG(ERROR, "Can't copy the node \"/aliases\" from the partial FDT");
+ return r;
+ }
+
+ return 0;
+}
+
+#else
+
+static int check_partial_fdt(libxl__gc *gc, void *fdt, size_t size)
+{
+ LOG(ERROR, "partial device tree not supported");
+
+ return ERROR_FAIL;
+}
+
+static int copy_partial_fdt(libxl__gc *gc, void *fdt, void *pfdt)
+{
+ /*
+ * We should never be here when the partial device tree is not
+ * supported.
+ * */
+ return -FDT_ERR_INTERNAL;
+}
+
+#endif /* ENABLE_PARTIAL_DEVICE_TREE */
+
#define FDT_MAX_SIZE (1<<20)
int libxl__arch_domain_init_hw_description(libxl__gc *gc,
struct xc_dom_image *dom)
{
void *fdt = NULL;
+ void *pfdt = NULL;
int rc, res;
size_t fdt_size = 0;
+ int pfdt_size = 0;
const libxl_version_info *vers;
const struct arch_info *ainfo;
vers->xen_version_major, vers->xen_version_minor);
LOG(DEBUG, " - vGIC version: %s", gicv_to_string(xc_config->gic_version));
+ if (info->device_tree) {
+ LOG(DEBUG, " - Partial device tree provided: %s", info->device_tree);
+
+ rc = libxl_read_file_contents(CTX, info->device_tree,
+ &pfdt, &pfdt_size);
+ if (rc) {
+ LOGEV(ERROR, rc, "failed to read the partial device file %s",
+ info->device_tree);
+ return ERROR_FAIL;
+ }
+ libxl__ptr_add(gc, pfdt);
+
+ if (check_partial_fdt(gc, pfdt, pfdt_size))
+ return ERROR_FAIL;
+ }
+
/*
* Call "call" handling FDT_ERR_*. Will either:
* - loop back to retry_resize
FDT( make_timer_node(gc, fdt, ainfo) );
FDT( make_hypervisor_node(gc, fdt, vers) );
+ if (pfdt)
+ FDT( copy_partial_fdt(gc, fdt, pfdt) );
+
FDT( fdt_end_node(fdt) );
FDT( fdt_finish(fdt) );
projects / xen.git / commitdiff