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, 116 insertions, 0 deletions

diff --git a/include/sound/jack.h b/include/sound/jack.h
new file mode 100644
index 000000000..715b95983
--- /dev/null
+++ b/include/sound/jack.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __SOUND_JACK_H
+#define __SOUND_JACK_H
+
+/*
+ *  Jack abstraction layer
+ *
+ *  Copyright 2008 Wolfson Microelectronics plc
+ */
+
+#include <sound/core.h>
+
+struct input_dev;
+
+/**
+ * enum snd_jack_types - Jack types which can be reported
+ * @SND_JACK_HEADPHONE: Headphone
+ * @SND_JACK_MICROPHONE: Microphone
+ * @SND_JACK_HEADSET: Headset
+ * @SND_JACK_LINEOUT: Line out
+ * @SND_JACK_MECHANICAL: Mechanical switch
+ * @SND_JACK_VIDEOOUT: Video out
+ * @SND_JACK_AVOUT: AV (Audio Video) out
+ * @SND_JACK_LINEIN:  Line in
+ * @SND_JACK_USB: USB audio device
+ * @SND_JACK_BTN_0: Button 0
+ * @SND_JACK_BTN_1: Button 1
+ * @SND_JACK_BTN_2: Button 2
+ * @SND_JACK_BTN_3: Button 3
+ * @SND_JACK_BTN_4: Button 4
+ * @SND_JACK_BTN_5: Button 5
+ *
+ * These values are used as a bitmask.
+ *
+ * Note that this must be kept in sync with the lookup table in
+ * sound/core/jack.c.
+ */
+enum snd_jack_types {
+	SND_JACK_HEADPHONE	= 0x0001,
+	SND_JACK_MICROPHONE	= 0x0002,
+	SND_JACK_HEADSET	= SND_JACK_HEADPHONE | SND_JACK_MICROPHONE,
+	SND_JACK_LINEOUT	= 0x0004,
+	SND_JACK_MECHANICAL	= 0x0008, /* If detected separately */
+	SND_JACK_VIDEOOUT	= 0x0010,
+	SND_JACK_AVOUT		= SND_JACK_LINEOUT | SND_JACK_VIDEOOUT,
+	SND_JACK_LINEIN		= 0x0020,
+	SND_JACK_USB		= 0x0040,
+
+	/* Kept separate from switches to facilitate implementation */
+	SND_JACK_BTN_0		= 0x4000,
+	SND_JACK_BTN_1		= 0x2000,
+	SND_JACK_BTN_2		= 0x1000,
+	SND_JACK_BTN_3		= 0x0800,
+	SND_JACK_BTN_4		= 0x0400,
+	SND_JACK_BTN_5		= 0x0200,
+};
+
+/* Keep in sync with definitions above */
+#define SND_JACK_SWITCH_TYPES 7
+
+struct snd_jack {
+	struct list_head kctl_list;
+	struct snd_card *card;
+	const char *id;
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+	struct input_dev *input_dev;
+	struct mutex input_dev_lock;
+	int registered;
+	int type;
+	char name[100];
+	unsigned int key[6];   /* Keep in sync with definitions above */
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
+	int hw_status_cache;
+	void *private_data;
+	void (*private_free)(struct snd_jack *);
+};
+
+#ifdef CONFIG_SND_JACK
+
+int snd_jack_new(struct snd_card *card, const char *id, int type,
+		 struct snd_jack **jack, bool initial_kctl, bool phantom_jack);
+int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask);
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
+		     int keytype);
+#endif
+void snd_jack_report(struct snd_jack *jack, int status);
+
+#else
+static inline int snd_jack_new(struct snd_card *card, const char *id, int type,
+			       struct snd_jack **jack, bool initial_kctl, bool phantom_jack)
+{
+	return 0;
+}
+
+static inline int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
+{
+	return 0;
+}
+
+static inline void snd_jack_report(struct snd_jack *jack, int status)
+{
+}
+
+#endif
+
+#if !defined(CONFIG_SND_JACK) || !defined(CONFIG_SND_JACK_INPUT_DEV)
+static inline int snd_jack_set_key(struct snd_jack *jack,
+				   enum snd_jack_types type,
+				   int keytype)
+{
+	return 0;
+}
+#endif /* !CONFIG_SND_JACK || !CONFIG_SND_JACK_INPUT_DEV */
+
+#endif