[Xen-devel] [PATCH v6 6/8] xen/arm: handle "multiboot, device-tree" compatible nodes

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Detect "multiboot,device-tree" compatible nodes. Add them to the bootmod
array as BOOTMOD_GUEST_DTB.  In kernel_probe, find the right
BOOTMOD_GUEST_DTB and store a pointer to it in dtb_bootmodule.

Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>
---
Changes in v4:
- use uint32_t
- remove useless 0 initialization
- add return value check

Changes in v2:
- rename BOOTMOD_DTB to BOOTMOD_GUEST_DTB
- rename multiboot,dtb to multiboot,device-tree
---
 xen/arch/arm/bootfdt.c      |  2 ++
 xen/arch/arm/kernel.c       | 14 +++++++++++++-
 xen/arch/arm/setup.c        |  1 +
 xen/include/asm-arm/setup.h |  1 +
 4 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index a7810abb15..08fb59f4e7 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -242,6 +242,8 @@ static void __init process_multiboot_node(const void *fdt, 
int node,
         kind = BOOTMOD_RAMDISK;
     else if ( fdt_node_check_compatible(fdt, node, "xen,xsm-policy") == 0 )
         kind = BOOTMOD_XSM;
+    else if ( fdt_node_check_compatible(fdt, node, "multiboot,device-tree") == 
0 )
+        kind = BOOTMOD_GUEST_DTB;
     else
         kind = BOOTMOD_UNKNOWN;
 
diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c
index 389bef2afa..8eff074836 100644
--- a/xen/arch/arm/kernel.c
+++ b/xen/arch/arm/kernel.c
@@ -425,7 +425,7 @@ int __init kernel_probe(struct kernel_info *info,
     struct bootmodule *mod = NULL;
     struct bootcmdline *cmd = NULL;
     struct dt_device_node *node;
-    u64 kernel_addr, initrd_addr, size;
+    u64 kernel_addr, initrd_addr, dtb_addr, size;
     int rc;
 
     /* domain is NULL only for the hardware domain */
@@ -469,6 +469,18 @@ int __init kernel_probe(struct kernel_info *info,
                 info->initrd_bootmodule = boot_module_find_by_addr_and_kind(
                         BOOTMOD_RAMDISK, initrd_addr);
             }
+            else if ( dt_device_is_compatible(node, "multiboot,device-tree") )
+            {
+                uint32_t len;
+                const __be32 *val;
+
+                val = dt_get_property(node, "reg", &len);
+                if ( val == NULL )
+                    continue;
+                dt_get_range(&val, node, &dtb_addr, &size);
+                info->dtb_bootmodule = boot_module_find_by_addr_and_kind(
+                        BOOTMOD_GUEST_DTB, dtb_addr);
+            }
             else
                 continue;
         }
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index fca7e68cba..d764a4e9b2 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -369,6 +369,7 @@ const char * __init 
boot_module_kind_as_string(bootmodule_kind kind)
     case BOOTMOD_KERNEL:  return "Kernel";
     case BOOTMOD_RAMDISK: return "Ramdisk";
     case BOOTMOD_XSM:     return "XSM";
+    case BOOTMOD_GUEST_DTB:     return "DTB";
     case BOOTMOD_UNKNOWN: return "Unknown";
     default: BUG();
     }
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index fa0a8721b2..2f8f24e286 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -16,6 +16,7 @@ typedef enum {
     BOOTMOD_KERNEL,
     BOOTMOD_RAMDISK,
     BOOTMOD_XSM,
+    BOOTMOD_GUEST_DTB,
     BOOTMOD_UNKNOWN
 }  bootmodule_kind;
 
-- 
2.17.1


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