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, 79 insertions, 0 deletions

diff --git a/include/video/kyro.h b/include/video/kyro.h
new file mode 100644
index 000000000..418eef6c5
--- /dev/null
+++ b/include/video/kyro.h
@@ -0,0 +1,79 @@
+/*
+ *  linux/drivers/video/kyro/kryo.h
+ *
+ *  Copyright (C) 2002 STMicroelectronics
+ *  Copyright (C) 2004 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _KYRO_H
+#define _KYRO_H
+
+struct kyrofb_info {
+	void __iomem *regbase;
+
+	u32 palette[16];
+	u32 HTot;	/* Hor Total Time    */
+	u32 HFP;	/* Hor Front Porch   */
+	u32 HST;	/* Hor Sync Time     */
+	u32 HBP;	/* Hor Back Porch    */
+	s32 HSP;		/* Hor Sync Polarity */
+	u32 VTot;	/* Ver Total Time    */
+	u32 VFP;	/* Ver Front Porch   */
+	u32 VST;	/* Ver Sync Time     */
+	u32 VBP;	/* Ver Back Porch    */
+	s32 VSP;		/* Ver Sync Polarity */
+	u32 XRES;	/* X Resolution      */
+	u32 YRES;	/* Y Resolution      */
+	u32 VFREQ;	/* Ver Frequency     */
+	u32 PIXCLK;	/* Pixel Clock       */
+	u32 HCLK;	/* Hor Clock         */
+
+	/* Useful to hold depth here for Linux */
+	u8 PIXDEPTH;
+
+	int wc_cookie;
+};
+
+/*
+ * benedict.gaster@superh.com
+ * Added the follow IOCTLS for the creation of overlay services...
+ */
+#define KYRO_IOC_MAGIC 'k'
+
+#define KYRO_IOCTL_OVERLAY_CREATE       _IO(KYRO_IOC_MAGIC, 0)
+#define KYRO_IOCTL_OVERLAY_VIEWPORT_SET _IO(KYRO_IOC_MAGIC, 1)
+#define KYRO_IOCTL_SET_VIDEO_MODE       _IO(KYRO_IOC_MAGIC, 2)
+#define KYRO_IOCTL_UVSTRIDE             _IO(KYRO_IOC_MAGIC, 3)
+#define KYRO_IOCTL_OVERLAY_OFFSET       _IO(KYRO_IOC_MAGIC, 4)
+#define KYRO_IOCTL_STRIDE               _IO(KYRO_IOC_MAGIC, 5)
+
+/*
+ * The follow 3 structures are used to pass data from user space into the kernel
+ * for the creation of overlay surfaces and setting the video mode.
+ */
+typedef struct _OVERLAY_CREATE {
+	u32 ulWidth;
+	u32 ulHeight;
+	int bLinear;
+} overlay_create;
+
+typedef struct _OVERLAY_VIEWPORT_SET {
+	u32 xOrgin;
+	u32 yOrgin;
+	u32 xSize;
+	u32 ySize;
+} overlay_viewport_set;
+
+typedef struct _SET_VIDEO_MODE {
+	u32 ulWidth;
+	u32 ulHeight;
+	u32 ulScan;
+	u8 displayDepth;
+	int bLinear;
+} set_video_mode;
+
+#endif /* _KYRO_H */