From a1b2d39f071f1e85d0adb2e041f4a8a9aa9a88a8 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Roger=20Pau=20Monn=C3=A9?= Date: Thu, 12 Nov 2015 16:58:07 +0100 Subject: [PATCH] elfnotes: intorduce a new PHYS_ENTRY elfnote MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Monné Acked-by: Wei Liu Reviewed-by: Andrew Cooper --- tools/xcutils/readnotes.c | 3 +++ xen/common/libelf/libelf-dominfo.c | 4 ++++ xen/include/public/elfnote.h | 12 +++++++++++- 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/tools/xcutils/readnotes.c b/tools/xcutils/readnotes.c index 5fa445eec3..e682dd1a21 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 3de1c230b2..dacd4ba868 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 3824a94572..353985fe58 100644 --- a/xen/include/public/elfnote.h +++ b/xen/include/public/elfnote.h @@ -199,10 +199,20 @@ */ #define XEN_ELFNOTE_SUPPORTED_FEATURES 17 +/* + * Physical entry point into the kernel. + * + * 32bit entry point into the kernel. When requested to launch the + * guest kernel in a HVM container, Xen will use this entry point to + * launch the guest in 32bit protected mode with paging disabled. + * Ignored otherwise. + */ +#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. -- 2.39.5