KVM: Don't pre-reserve xarray entries when storing empty/NULL attributesgrafted

Skip the xarray reservation loop when clearing all memory attributes, as
storing NULL only erases the entry and never needs to allocate, so no
reservation (and no cleanup of a failed one) is required in that case.

Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: David Ballesteros <davimaba.v@proton.me>
Signed-off-by: Zeng Chi <zengchi@kylinos.cn>
Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/Documentation/maintainer/configure-git.rst b/Documentation/maintainer/configure-git.rst
new file mode 100644
index 000000000..0c21f203c
--- /dev/null
+++ b/Documentation/maintainer/configure-git.rst
@@ -0,0 +1,30 @@
+Configuring Git
+===============
+
+This chapter describes maintainer level git configuration.
+
+Tagged branches used in pull requests (see
+Documentation/maintainer/pull-requests.rst) should be signed with the
+developers public GPG key. Signed tags can be created by passing
+``-u <key-id>`` to ``git tag``. However, since you would *usually* use the same
+key for the project, you can set it in the configuration and use the ``-s``
+flag. To set the default ``key-id`` use::
+
+	git config user.signingkey "keyname"
+
+Alternatively, edit your ``.git/config`` or ``~/.gitconfig`` file by hand::
+
+	[user]
+		name = Jane Developer
+		email = jd@domain.org
+		signingkey = jd@domain.org
+
+You may need to tell ``git`` to use ``gpg2``::
+
+	[gpg]
+		program = /path/to/gpg2
+
+You may also like to tell ``gpg`` which ``tty`` to use (add to your shell
+rc file)::
+
+	export GPG_TTY=$(tty)