Message-ID: <20240814195053.5564-2-jason.andryuk@amd.com>
Date: Wed, 14 Aug 2024 15:50:49 -0400
From: Jason Andryuk <jason.andryuk@....com>
To: Juergen Gross <jgross@...e.com>, Boris Ostrovsky
	<boris.ostrovsky@...cle.com>, Thomas Gleixner <tglx@...utronix.de>, "Ingo
 Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, <x86@...nel.org>, "H. Peter Anvin"
	<hpa@...or.com>, Stefano Stabellini <sstabellini@...nel.org>, "Oleksandr
 Tyshchenko" <oleksandr_tyshchenko@...m.com>, Paolo Bonzini
	<pbonzini@...hat.com>, Brian Gerst <brgerst@...il.com>
CC: <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>, "Jason
 Andryuk" <jason.andryuk@....com>
Subject: [PATCH v2 1/5] xen: sync elfnote.h from xen tree

Sync Xen's elfnote.h header from xen.git to pull in the
XEN_ELFNOTE_PHYS32_RELOC define.

xen commit dfc9fab00378 ("x86/PVH: Support relocatable dom0 kernels")

This is a copy except for the removal of the emacs editor config at the
end of the file.

Signed-off-by: Jason Andryuk <jason.andryuk@....com>
Reviewed-by: Juergen Gross <jgross@...e.com>
---
 include/xen/interface/elfnote.h | 93 +++++++++++++++++++++++++++++++--
 1 file changed, 88 insertions(+), 5 deletions(-)

diff --git a/include/xen/interface/elfnote.h b/include/xen/interface/elfnote.h
index 38deb1214613..918f47d87d7a 100644
--- a/include/xen/interface/elfnote.h
+++ b/include/xen/interface/elfnote.h
@@ -11,7 +11,9 @@
 #define __XEN_PUBLIC_ELFNOTE_H__
 
 /*
- * The notes should live in a SHT_NOTE segment and have "Xen" in the
+ * `incontents 200 elfnotes ELF notes
+ *
+ * The notes should live in a PT_NOTE segment and have "Xen" in the
  * name field.
  *
  * Numeric types are either 4 or 8 bytes depending on the content of
@@ -22,6 +24,8 @@
  *
  * String values (for non-legacy) are NULL terminated ASCII, also known
  * as ASCIZ type.
+ *
+ * Xen only uses ELF Notes contained in x86 binaries.
  */
 
 /*
@@ -52,7 +56,7 @@
 #define XEN_ELFNOTE_VIRT_BASE      3
 
 /*
- * The offset of the ELF paddr field from the acutal required
+ * The offset of the ELF paddr field from the actual required
  * pseudo-physical address (numeric).
  *
  * This is used to maintain backwards compatibility with older kernels
@@ -92,7 +96,12 @@
 #define XEN_ELFNOTE_LOADER         8
 
 /*
- * The kernel supports PAE (x86/32 only, string = "yes" or "no").
+ * The kernel supports PAE (x86/32 only, string = "yes", "no" or
+ * "bimodal").
+ *
+ * For compatibility with Xen 3.0.3 and earlier the "bimodal" setting
+ * may be given as "yes,bimodal" which will cause older Xen to treat
+ * this kernel as PAE.
  *
  * LEGACY: PAE (n.b. The legacy interface included a provision to
  * indicate 'extended-cr3' support allowing L3 page tables to be
@@ -149,7 +158,9 @@
  * The (non-default) location the initial phys-to-machine map should be
  * placed at by the hypervisor (Dom0) or the tools (DomU).
  * The kernel must be prepared for this mapping to be established using
- * large pages, despite such otherwise not being available to guests.
+ * large pages, despite such otherwise not being available to guests. Note
+ * that these large pages may be misaligned in PFN space (they'll obviously
+ * be aligned in MFN and virtual address spaces).
  * The kernel must also be able to handle the page table pages used for
  * this mapping not being accessible through the initial mapping.
  * (Only x86-64 supports this at present.)
@@ -185,9 +196,81 @@
  */
 #define XEN_ELFNOTE_PHYS32_ENTRY 18
 
+/*
+ * Physical loading constraints for PVH kernels
+ *
+ * The presence of this note indicates the kernel supports relocating itself.
+ *
+ * The note may include up to three 32bit values to place constraints on the
+ * guest physical loading addresses and alignment for a PVH kernel.  Values
+ * are read in the following order:
+ *  - a required start alignment (default 0x200000)
+ *  - a minimum address for the start of the image (default 0; see below)
+ *  - a maximum address for the last byte of the image (default 0xffffffff)
+ *
+ * When this note specifies an alignment value, it is used.  Otherwise the
+ * maximum p_align value from loadable ELF Program Headers is used, if it is
+ * greater than or equal to 4k (0x1000).  Otherwise, the default is used.
+ */
+#define XEN_ELFNOTE_PHYS32_RELOC 19
+
 /*
  * The number of the highest elfnote defined.
  */
-#define XEN_ELFNOTE_MAX XEN_ELFNOTE_PHYS32_ENTRY
+#define XEN_ELFNOTE_MAX XEN_ELFNOTE_PHYS32_RELOC
+
+/*
+ * System information exported through crash notes.
+ *
+ * The kexec / kdump code will create one XEN_ELFNOTE_CRASH_INFO
+ * note in case of a system crash. This note will contain various
+ * information about the system, see xen/include/xen/elfcore.h.
+ */
+#define XEN_ELFNOTE_CRASH_INFO 0x1000001
+
+/*
+ * System registers exported through crash notes.
+ *
+ * The kexec / kdump code will create one XEN_ELFNOTE_CRASH_REGS
+ * note per cpu in case of a system crash. This note is architecture
+ * specific and will contain registers not saved in the "CORE" note.
+ * See xen/include/xen/elfcore.h for more information.
+ */
+#define XEN_ELFNOTE_CRASH_REGS 0x1000002
+
+
+/*
+ * xen dump-core none note.
+ * xm dump-core code will create one XEN_ELFNOTE_DUMPCORE_NONE
+ * in its dump file to indicate that the file is xen dump-core
+ * file. This note doesn't have any other information.
+ * See tools/libxc/xc_core.h for more information.
+ */
+#define XEN_ELFNOTE_DUMPCORE_NONE               0x2000000
+
+/*
+ * xen dump-core header note.
+ * xm dump-core code will create one XEN_ELFNOTE_DUMPCORE_HEADER
+ * in its dump file.
+ * See tools/libxc/xc_core.h for more information.
+ */
+#define XEN_ELFNOTE_DUMPCORE_HEADER             0x2000001
+
+/*
+ * xen dump-core xen version note.
+ * xm dump-core code will create one XEN_ELFNOTE_DUMPCORE_XEN_VERSION
+ * in its dump file. It contains the xen version obtained via the
+ * XENVER hypercall.
+ * See tools/libxc/xc_core.h for more information.
+ */
+#define XEN_ELFNOTE_DUMPCORE_XEN_VERSION        0x2000002
+
+/*
+ * xen dump-core format version note.
+ * xm dump-core code will create one XEN_ELFNOTE_DUMPCORE_FORMAT_VERSION
+ * in its dump file. It contains a format version identifier.
+ * See tools/libxc/xc_core.h for more information.
+ */
+#define XEN_ELFNOTE_DUMPCORE_FORMAT_VERSION     0x2000003
 
 #endif /* __XEN_PUBLIC_ELFNOTE_H__ */
-- 
2.34.1

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