[Xen-devel] [PATCH v6 22/29] elfnotes: intorduce a new PHYS_ENTRY elfnote

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

This new elfnote contains the 32bit entry point into the kernel. Xen will
use this entry point in order to launch the guest kernel in 32bit protected
mode with paging disabled.

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Changes since v4:
 - Add Andrew Cooper Reviewed-by and Wei Liu Acked-by.
---
 tools/xcutils/readnotes.c          |  3 +++
 xen/common/libelf/libelf-dominfo.c |  4 ++++
 xen/include/public/elfnote.h       | 11 ++++++++++-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/xcutils/readnotes.c b/tools/xcutils/readnotes.c
index 5fa445e..e682dd1 100644
--- a/tools/xcutils/readnotes.c
+++ b/tools/xcutils/readnotes.c
@@ -159,6 +159,9 @@ static unsigned print_notes(struct elf_binary *elf, 
ELF_HANDLE_DECL(elf_note) st
                case XEN_ELFNOTE_L1_MFN_VALID:
                        print_l1_mfn_valid_note("L1_MFN_VALID", elf , note);
                        break;
+               case XEN_ELFNOTE_PHYS32_ENTRY:
+                       print_numeric_note("PHYS32_ENTRY", elf , note);
+                       break;
                default:
                        printf("unknown note type %#x\n",
                               (unsigned)elf_uval(elf, note, type));
diff --git a/xen/common/libelf/libelf-dominfo.c 
b/xen/common/libelf/libelf-dominfo.c
index f929968..365e058 100644
--- a/xen/common/libelf/libelf-dominfo.c
+++ b/xen/common/libelf/libelf-dominfo.c
@@ -119,6 +119,7 @@ elf_errorstatus elf_xen_parse_note(struct elf_binary *elf,
         [XEN_ELFNOTE_BSD_SYMTAB] = { "BSD_SYMTAB", 1},
         [XEN_ELFNOTE_SUSPEND_CANCEL] = { "SUSPEND_CANCEL", 0 },
         [XEN_ELFNOTE_MOD_START_PFN] = { "MOD_START_PFN", 0 },
+        [XEN_ELFNOTE_PHYS32_ENTRY] = { "PHYS32_ENTRY", 0 },
     };
 /* *INDENT-ON* */
 
@@ -212,6 +213,9 @@ elf_errorstatus elf_xen_parse_note(struct elf_binary *elf,
                 elf, note, sizeof(*parms->f_supported), i);
         break;
 
+    case XEN_ELFNOTE_PHYS32_ENTRY:
+        parms->phys_entry = val;
+        break;
     }
     return 0;
 }
diff --git a/xen/include/public/elfnote.h b/xen/include/public/elfnote.h
index 3824a94..e6fc596 100644
--- a/xen/include/public/elfnote.h
+++ b/xen/include/public/elfnote.h
@@ -200,9 +200,18 @@
 #define XEN_ELFNOTE_SUPPORTED_FEATURES 17
 
 /*
+ * Physical entry point into the kernel.
+ *
+ * 32bit entry point into the kernel. Xen will use this entry point
+ * in order to launch the guest kernel in 32bit protected mode
+ * with paging disabled.
+ */
+#define XEN_ELFNOTE_PHYS32_ENTRY 18
+
+/*
  * The number of the highest elfnote defined.
  */
-#define XEN_ELFNOTE_MAX XEN_ELFNOTE_SUPPORTED_FEATURES
+#define XEN_ELFNOTE_MAX XEN_ELFNOTE_PHYS32_ENTRY
 
 /*
  * System information exported through crash notes.
-- 
1.9.5 (Apple Git-50.3)


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