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, 41 insertions, 0 deletions

diff --git a/include/sound/sdca_hid.h b/include/sound/sdca_hid.h
new file mode 100644
index 000000000..848081df3
--- /dev/null
+++ b/include/sound/sdca_hid.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+/*
+ * The MIPI SDCA specification is available for public downloads at
+ * https://www.mipi.org/mipi-sdca-v1-0-download
+ *
+ */
+
+#ifndef __SDCA_HID_H__
+#define __SDCA_HID_H__
+
+struct device;
+struct sdw_slave;
+
+struct sdca_entity;
+struct sdca_interrupt;
+
+#if IS_ENABLED(CONFIG_SND_SOC_SDCA_HID)
+
+int sdca_add_hid_device(struct sdca_interrupt *interrupt);
+void sdca_destroy_hid_device(struct sdca_interrupt *interrupt);
+int sdca_hid_process_report(struct sdca_interrupt *interrupt);
+
+#else
+
+static inline int sdca_add_hid_device(struct sdca_interrupt *interrupt)
+{
+	return 0;
+}
+
+static inline void sdca_destroy_hid_device(struct sdca_interrupt *interrupt)
+{
+}
+
+static inline int sdca_hid_process_report(struct sdca_interrupt *interrupt)
+{
+	return 0;
+}
+
+#endif
+
+#endif /* __SDCA_HID_H__ */