KVM: selftests: Play nice with EACCES errors in open_path_or_exit()

Expand the SKIP conditions of the open_path_or_exit() helper to skip on
EACCES as well as ENOENT.  Most often, lack of permissions to a file
needed by a KVM selftests is due to a file being root-only by default,
not because of any bug/misconfiguration that warrants failing a test.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

Author: sean-jc

tools/testing/selftests/kvm/lib/kvm_util.c

@@ -37,9 +37,10 @@ int __open_path_or_exit(const char *path, int flags, const char *enoent_help)
 	return fd;
 
 error:
-	if (errno == ENOENT)
+	if (errno == EACCES || errno == ENOENT)
 		ksft_exit_skip("- Cannot open '%s': %s.  %s\n",
-			       path, strerror(errno), enoent_help);
+			       path, strerror(errno),
+			       errno == EACCES ? "Root required?" : enoent_help);
 	TEST_FAIL("Failed to open '%s'", path);
 }