From: "Daniel P. Smith" <dpsm...@apertussolutions.com>
Add the ability to detect both a formal hyperlaunch device tree or a dom0less
device tree. If the hyperlaunch device tree is found, then count the number of
domain entries, reporting an error if more than one is found.
Signed-off-by: Daniel P. Smith <dpsm...@apertussolutions.com>
Signed-off-by: Jason Andryuk <jason.andr...@amd.com>
Signed-off-by: Alejandro Vallejo <agarc...@amd.com>
---
v4:
* Panic if we're booting on hyperlaunch, but walking the DTB fails.
* Remove inconsequential "else" clause in fdt.c
* Remove stub, as it's not required due to DCE
* Use min() rather than open-code it
---
xen/arch/x86/include/asm/bootinfo.h | 1 +
xen/common/domain-builder/core.c | 11 +++++
xen/common/domain-builder/fdt.c | 63 +++++++++++++++++++++++++++++
xen/common/domain-builder/fdt.h | 1 +
4 files changed, 76 insertions(+)
diff --git a/xen/arch/x86/include/asm/bootinfo.h
b/xen/arch/x86/include/asm/bootinfo.h
index 82c2650fcf..1e3d582e45 100644
--- a/xen/arch/x86/include/asm/bootinfo.h
+++ b/xen/arch/x86/include/asm/bootinfo.h
@@ -84,6 +84,7 @@ struct boot_info {
bool hyperlaunch_enabled;
unsigned int nr_modules;
+ unsigned int nr_domains;
struct boot_module mods[MAX_NR_BOOTMODS + 1];
struct boot_domain domains[MAX_NR_BOOTDOMS];
};
diff --git a/xen/common/domain-builder/core.c b/xen/common/domain-builder/core.c
index a5b21fc179..3b062e85ec 100644
--- a/xen/common/domain-builder/core.c
+++ b/xen/common/domain-builder/core.c
@@ -43,6 +43,17 @@ void __init builder_init(struct boot_info *bi)
break;
}
}
+
+ if ( bi->hyperlaunch_enabled )
+ {
+ int ret;
+
+ printk(XENLOG_INFO "Hyperlaunch configuration:\n");
+ if ( (ret = walk_hyperlaunch_fdt(bi)) < 0 )
+ panic("Walk of device tree failed (%d)\n", ret);
+
+ printk(XENLOG_INFO " number of domains: %u\n", bi->nr_domains);
+ }
}
/*
diff --git a/xen/common/domain-builder/fdt.c b/xen/common/domain-builder/fdt.c
index aaf8c1cc16..b5ff8220da 100644
--- a/xen/common/domain-builder/fdt.c
+++ b/xen/common/domain-builder/fdt.c
@@ -13,6 +13,36 @@
#include "fdt.h"
+static int __init find_hyperlaunch_node(const void *fdt)
+{
+ int hv_node = fdt_path_offset(fdt, "/chosen/hypervisor");
+
+ if ( hv_node >= 0 )
+ {
+ /* Anything other than zero indicates no match */
+ if ( fdt_node_check_compatible(fdt, hv_node, "hypervisor,xen") )
+ return -ENODATA;
+
+ return hv_node;
+ }
+ else
+ {
+ /* Look for dom0less config */
+ int node, chosen_node = fdt_path_offset(fdt, "/chosen");
+
+ if ( chosen_node < 0 )
+ return -ENOENT;
+
+ fdt_for_each_subnode(node, fdt, chosen_node)
+ {
+ if ( !fdt_node_check_compatible(fdt, node, "xen,domain") )
+ return chosen_node;
+ }
+ }
+
+ return -ENODATA;
+}
+
int __init has_hyperlaunch_fdt(const struct boot_info *bi)
{
int ret = 0;
@@ -20,7 +50,40 @@ int __init has_hyperlaunch_fdt(const struct boot_info *bi)
if ( !fdt || fdt_check_header(fdt) < 0 )
ret = -EINVAL;
+ else
+ ret = find_hyperlaunch_node(fdt);
+
+ bootstrap_unmap();
+
+ return min(0, ret);
+}
+
+int __init walk_hyperlaunch_fdt(struct boot_info *bi)
+{
+ int ret = 0, hv_node, node;
+ const void *fdt = bootstrap_map_bm(&bi->mods[HYPERLAUNCH_MODULE_IDX]);
+
+ if ( unlikely(!fdt) )
+ return -EINVAL;
+
+ hv_node = find_hyperlaunch_node(fdt);
+ if ( hv_node < 0 )
+ {
+ ret = hv_node;
+ goto err_out;
+ }
+
+ fdt_for_each_subnode(node, fdt, hv_node)
+ {
+ if ( !fdt_node_check_compatible(fdt, node, "xen,domain") )
+ bi->nr_domains++;
+ }
+
+ /* Until multi-domain construction is added, throw an error */
+ if ( bi->nr_domains != 1 )
+ printk(XENLOG_ERR "hyperlaunch only supports dom0 construction\n");
+ err_out:
bootstrap_unmap();
return ret;
diff --git a/xen/common/domain-builder/fdt.h b/xen/common/domain-builder/fdt.h
index 97a45a6ec4..955aead497 100644
--- a/xen/common/domain-builder/fdt.h
+++ b/xen/common/domain-builder/fdt.h
@@ -8,5 +8,6 @@ struct boot_info;
#define HYPERLAUNCH_MODULE_IDX 0
int has_hyperlaunch_fdt(const struct boot_info *bi);
+int walk_hyperlaunch_fdt(struct boot_info *bi);
#endif /* __XEN_DOMAIN_BUILDER_FDT_H__ */
--
2.43.0
