[PATCH v6 15/44] x86/boot: introduce consumed flag for struct boot_module

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

Allow the tracking of when a boot module has been consumed by a handler in the
hypervisor independent of when it is claimed. The instances where the
hypervisor does nothing beyond claiming, the dom0 kernel, dom0 ramdisk, and a
placeholder for itself, are updated as being consumed at the time of being
claimed.

Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
---
Changes since v5:
- first flag assignment can be = instead of |=
---
 xen/arch/x86/include/asm/bootinfo.h | 1 +
 xen/arch/x86/setup.c                | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/xen/arch/x86/include/asm/bootinfo.h 
b/xen/arch/x86/include/asm/bootinfo.h
index 3010e6f4af9c..6903ab00ec90 100644
--- a/xen/arch/x86/include/asm/bootinfo.h
+++ b/xen/arch/x86/include/asm/bootinfo.h
@@ -42,6 +42,7 @@ struct boot_module {
 
     uint32_t flags;
 #define BOOTMOD_FLAG_X86_RELOCATED     (1U << 0)
+#define BOOTMOD_FLAG_X86_CONSUMED      (1U << 1)
 
     paddr_t start;
     size_t size;
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 44cec48fc877..8261a87d9fb4 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -318,6 +318,7 @@ static struct boot_info *__init 
multiboot_fill_boot_info(unsigned long mbi_p)
 
     /* map the last mb module for xen entry */
     bi->mods[bi->nr_modules].type = BOOTMOD_XEN;
+    bi->mods[bi->nr_modules].flags = BOOTMOD_FLAG_X86_CONSUMED;
 
     return bi;
 }
@@ -1180,6 +1181,7 @@ void asmlinkage __init noreturn __start_xen(unsigned long 
mbi_p)
     bitmap_fill(module_map, bi->nr_modules);
     __clear_bit(0, module_map); /* Dom0 kernel is always first */
     bi->mods[0].type = BOOTMOD_KERNEL;
+    bi->mods[0].flags = BOOTMOD_FLAG_X86_CONSUMED;
 
     if ( pvh_boot )
     {
@@ -2068,7 +2070,10 @@ void asmlinkage __init noreturn __start_xen(unsigned 
long mbi_p)
 
     initrdidx = find_first_bit(module_map, bi->nr_modules);
     if ( initrdidx < bi->nr_modules )
+    {
         bi->mods[initrdidx].type = BOOTMOD_RAMDISK;
+        bi->mods[initrdidx].flags |= BOOTMOD_FLAG_X86_CONSUMED;
+    }
     if ( bitmap_weight(module_map, bi->nr_modules) > 1 )
         printk(XENLOG_WARNING
                "Multiple initrd candidates, picking module #%u\n",
-- 
2.30.2