Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging

Pull request

# gpg: Signature made Wed 24 Jun 2020 11:01:57 BST
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/block-pull-request:
  block/nvme: support nested aio_poll()
  block/nvme: keep BDRVNVMeState pointer in NVMeQueuePair
  block/nvme: clarify that free_req_queue is protected by q->lock
  block/nvme: switch to a NVMeRequest freelist
  block/nvme: don't access CQE after moving cq.head
  block/nvme: drop tautologous assertion
  block/nvme: poll queues without q->lock
  check-block: enable iotests with SafeStack
  configure: add flags to support SafeStack
  coroutine: add check for SafeStack in sigaltstack
  coroutine: support SafeStack in ucontext backend
  minikconf: explicitly set encoding to UTF-8

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

scripts/minikconf.py

@@ -402,7 +402,7 @@ class KconfigParser:
         if incl_abs_fname in self.data.previously_included:
             return
         try:
-            fp = open(incl_abs_fname, 'r')
+            fp = open(incl_abs_fname, 'rt', encoding='utf-8')
         except IOError as e:
             raise KconfigParserError(self,
                                 '%s: %s' % (e.strerror, include))
@@ -696,7 +696,7 @@ if __name__ == '__main__':
             parser.do_assignment(name, value == 'y')
             external_vars.add(name[7:])
         else:
-            fp = open(arg, 'r')
+            fp = open(arg, 'rt', encoding='utf-8')
             parser.parse_file(fp)
             fp.close()
 
@@ -705,7 +705,7 @@ if __name__ == '__main__':
         if key not in external_vars and config[key]:
             print ('CONFIG_%s=y' % key)
 
-    deps = open(argv[2], 'w')
+    deps = open(argv[2], 'wt', encoding='utf-8')
     for fname in data.previously_included:
         print ('%s: %s' % (argv[1], fname), file=deps)
     deps.close()