x86/boot: move kextra into boot info

... so it can be removed as a distinct parameter to create_dom0().

Signed-off-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/include/asm/bootinfo.h

@@ -66,6 +66,7 @@ struct boot_module {
 struct boot_info {
     const char *loader;
     const char *cmdline;
+    const char *kextra;
 
     paddr_t memmap_addr;
     size_t memmap_length;

xen/arch/x86/setup.c

@@ -1108,6 +1108,7 @@ void asmlinkage __init noreturn __start_xen(void)
         *kextra = '\0';
         kextra += 3;
         while ( kextra[1] == ' ' ) kextra++;
+        bi->kextra = kextra;
     }
     cmdline_parse(bi->cmdline);
 
@@ -2111,7 +2112,7 @@ void asmlinkage __init noreturn __start_xen(void)
     dom0 = create_dom0(bi->mods[0].mod, bi->mods[0].headroom,
                        initrdidx < bi->nr_modules ? bi->mods[initrdidx].mod
                                                   : NULL,
-                       kextra, bi->loader);
+                       bi->kextra, bi->loader);
     if ( !dom0 )
         panic("Could not set up DOM0 guest OS\n");