[PATCH v2 02/15] x86/boot: introduce domid field to struct boot_domain

["Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>]

Add a domid field to struct boot_domain to hold the assigned domain id for the
domain. During initialization, ensure all instances of struct boot_domain have
the invalid domid to ensure that the domid must be set either by convention or
configuration.

Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
---
Changes since v1 dom0 device tree:
- made .domid part of the static init of xen_boot_info

Changes since v9 boot modules
- missing include for domid_t def
---
 xen/arch/x86/include/asm/bootdomain.h |  4 ++++
 xen/arch/x86/setup.c                  | 10 +++++-----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/xen/arch/x86/include/asm/bootdomain.h 
b/xen/arch/x86/include/asm/bootdomain.h
index 8d0e5c78d426..67be575fe781 100644
--- a/xen/arch/x86/include/asm/bootdomain.h
+++ b/xen/arch/x86/include/asm/bootdomain.h
@@ -5,10 +5,14 @@
  * Copyright (c) 2024 Christopher Clark <christopher.w.clark@xxxxxxxxx>
  */
 
+#include <public/xen.h>
+
 #ifndef __XEN_X86_BOOTDOMAIN_H__
 #define __XEN_X86_BOOTDOMAIN_H__
 
 struct boot_domain {
+    domid_t domid;
+
     struct boot_module *kernel;
     struct boot_module *ramdisk;
 
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 7e4529d6bfb2..27937a7f7aeb 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -292,6 +292,7 @@ static const char *cmdline_cook(const char *p, const char 
*loader_name);
 struct boot_info __initdata xen_boot_info = {
     .loader = "unknown",
     .cmdline = "",
+    .domains = { {.domid = DOMID_INVALID} },
 };
 
 static struct boot_info *__init multiboot_fill_boot_info(
@@ -991,7 +992,6 @@ static struct domain *__init create_dom0(struct boot_info 
*bi)
     };
     struct boot_domain *bd = &bi->domains[0];
     struct domain *d;
-    domid_t domid;
 
     if ( opt_dom0_pvh )
     {
@@ -1007,15 +1007,15 @@ static struct domain *__init create_dom0(struct 
boot_info *bi)
         dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
 
     /* Create initial domain.  Not d0 for pvshim. */
-    domid = get_initial_domain_id();
-    d = domain_create(domid, &dom0_cfg, pv_shim ? 0 : CDF_privileged);
+    bd->domid = get_initial_domain_id();
+    d = domain_create(bd->domid, &dom0_cfg, pv_shim ? 0 : CDF_privileged);
     if ( IS_ERR(d) )
-        panic("Error creating d%u: %ld\n", domid, PTR_ERR(d));
+        panic("Error creating d%u: %ld\n", bd->domid, PTR_ERR(d));
 
     init_dom0_cpuid_policy(d);
 
     if ( alloc_dom0_vcpu0(d) == NULL )
-        panic("Error creating d%uv0\n", domid);
+        panic("Error creating d%uv0\n", bd->domid);
 
     /* Grab the DOM0 command line. */
     if ( bd->kernel->cmdline_pa || bi->kextra )
-- 
2.30.2