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, 56 insertions, 0 deletions

diff --git a/drivers/hid/hid-nti.c b/drivers/hid/hid-nti.c
new file mode 100644
index 000000000..03f7dd491
--- /dev/null
+++ b/drivers/hid/hid-nti.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  USB HID quirks support for Network Technologies, Inc. "USB-SUN" USB
+ *  adapter for pre-USB Sun keyboards
+ *
+ *  Copyright (c) 2011 Google, Inc.
+ *
+ * Based on HID apple driver by
+ *  Copyright (c) 1999 Andreas Gal
+ *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ *  Copyright (c) 2006-2007 Jiri Kosina
+ *  Copyright (c) 2008 Jiri Slaby <jirislaby@gmail.com>
+ */
+
+/*
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+MODULE_AUTHOR("Jonathan Klabunde Tomer <jktomer@google.com>");
+MODULE_DESCRIPTION("HID driver for Network Technologies USB-SUN keyboard adapter");
+
+/*
+ * NTI Sun keyboard adapter has wrong logical maximum in report descriptor
+ */
+static const __u8 *nti_usbsun_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+		unsigned int *rsize)
+{
+	if (*rsize >= 60 && rdesc[53] == 0x65 && rdesc[59] == 0x65) {
+		hid_info(hdev, "fixing up NTI USB-SUN keyboard adapter report descriptor\n");
+		rdesc[53] = rdesc[59] = 0xe7;
+	}
+	return rdesc;
+}
+
+static const struct hid_device_id nti_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_NTI, USB_DEVICE_ID_USB_SUN) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, nti_devices);
+
+static struct hid_driver nti_driver = {
+	.name = "nti",
+	.id_table = nti_devices,
+	.report_fixup = nti_usbsun_report_fixup
+};
+
+module_hid_driver(nti_driver);
+
+MODULE_LICENSE("GPL");