File 65263475-pygrub-remove-unnecessary-hypercall.patch of Package xen.31417

# Commit f4b504c6170c446e61055cbd388ae4e832a9deca
# Date 2023-10-11 06:36:50 +0100
# Author Alejandro Vallejo <alejandro.vallejo@cloud.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
tools/pygrub: Remove unnecessary hypercall

There's a hypercall being issued in order to determine whether PV64 is
supported, but since Xen 4.3 that's strictly true so it's not required.

Plus, this way we can avoid mapping the privcmd interface altogether in the
depriv pygrub.

This is part of XSA-443 / CVE-2023-34325

Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

--- a/tools/pygrub/src/pygrub
+++ b/tools/pygrub/src/pygrub
@@ -18,7 +18,6 @@ import os, sys, string, struct, tempfile
 import copy
 import logging
 import platform
-import xen.lowlevel.xc
 
 import curses, _curses, curses.textpad, curses.ascii
 import getopt
@@ -668,14 +667,6 @@ def run_grub(file, entry, fs, cfg_args):
 
     return grubcfg
 
-def supports64bitPVguest():
-    xc = xen.lowlevel.xc.xc()
-    caps = xc.xeninfo()['xen_caps'].split(" ")
-    for cap in caps:
-        if cap == "xen-3.0-x86_64":
-            return True
-    return False
-
 # If nothing has been specified, look for a Solaris domU. If found, perform the
 # necessary tweaks.
 def sniff_solaris(fs, cfg):
@@ -684,8 +675,7 @@ def sniff_solaris(fs, cfg):
         return cfg
 
     if not cfg["kernel"]:
-        if supports64bitPVguest() and \
-          fs.file_exists("/platform/i86xpv/kernel/amd64/unix"):
+        if fs.file_exists("/platform/i86xpv/kernel/amd64/unix"):
             cfg["kernel"] = "/platform/i86xpv/kernel/amd64/unix"
             cfg["ramdisk"] = "/platform/i86pc/amd64/boot_archive"
         elif fs.file_exists("/platform/i86xpv/kernel/unix"):