tools/libelf: fix elf notes check for PVH guest

PVH only requires PHYS32_ENTRY to be set. Return immediately if that's
the case.

Also remove the printk in pvh_load_kernel.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/hvm/dom0_build.c

@@ -484,10 +484,6 @@ static int __init pvh_load_kernel(struct domain *d, const module_t *image,
         return -EINVAL;
     }
 
-    printk("OS: %s version: %s loader: %s bitness: %s\n", parms.guest_os,
-           parms.guest_ver, parms.loader,
-           elf_64bit(&elf) ? "64-bit" : "32-bit");
-
     /* Copy the OS image and free temporary buffer. */
     elf.dest_base = (void *)(parms.virt_kstart - parms.virt_base);
     elf.dest_size = parms.virt_kend - parms.virt_kstart;

xen/common/libelf/libelf-dominfo.c

@@ -381,6 +381,13 @@ static elf_errorstatus elf_xen_note_check(struct elf_binary *elf,
          return 0;
     }
 
+    /* PVH only requires one ELF note to be set */
+    if ( parms->phys_entry != UNSET_ADDR32 )
+    {
+        elf_msg(elf, "ELF: Found PVH image\n");
+        return 0;
+    }
+
     /* Check the contents of the Xen notes or guest string. */
     if ( ((strlen(parms->loader) == 0) ||
           strncmp(parms->loader, "generic", 7)) &&
@@ -389,7 +396,7 @@ static elf_errorstatus elf_xen_note_check(struct elf_binary *elf,
     {
         elf_err(elf,
                 "ERROR: Will only load images built for the generic loader or Linux images"
-                " (Not '%.*s' and '%.*s')\n",
+                " (Not '%.*s' and '%.*s') or with PHYS32_ENTRY set\n",
                 (int)sizeof(parms->loader), parms->loader,
                 (int)sizeof(parms->guest_os), parms->guest_os);
         return -1;