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>

3 files changed, 252 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/board/fsl,bcsr.yaml b/Documentation/devicetree/bindings/board/fsl,bcsr.yaml
new file mode 100644
index 000000000..df3dd8399
--- /dev/null
+++ b/Documentation/devicetree/bindings/board/fsl,bcsr.yaml
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/board/fsl,bcsr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Board Control and Status
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    enum:
+      - fsl,mpc8360mds-bcsr
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    board@f8000000 {
+        compatible = "fsl,mpc8360mds-bcsr";
+        reg = <0xf8000000 0x8000>;
+    };
+
diff --git a/Documentation/devicetree/bindings/board/fsl,fpga-qixis-i2c.yaml b/Documentation/devicetree/bindings/board/fsl,fpga-qixis-i2c.yaml
new file mode 100644
index 000000000..e889dac05
--- /dev/null
+++ b/Documentation/devicetree/bindings/board/fsl,fpga-qixis-i2c.yaml
@@ -0,0 +1,128 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/board/fsl,fpga-qixis-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale on-board FPGA connected on I2C bus
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - fsl,bsc9132qds-fpga
+          - const: fsl,fpga-qixis-i2c
+      - items:
+          - enum:
+              - fsl,ls1028aqds-fpga
+              - fsl,lx2160aqds-fpga
+          - const: fsl,fpga-qixis-i2c
+          - const: simple-mfd
+      - const: fsl,lx2160ardb-fpga
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  interrupts:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  mux-controller:
+    $ref: /schemas/mux/reg-mux.yaml
+
+patternProperties:
+  "^gpio@[0-9a-f]+$":
+    type: object
+    additionalProperties: true
+
+    properties:
+      compatible:
+        contains:
+          enum:
+            - fsl,lx2160ardb-fpga-gpio-sfp
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,lx2160ardb-fpga
+    then:
+      required:
+        - "#address-cells"
+        - "#size-cells"
+    else:
+      properties:
+        "#address-cells": false
+        "#size-cells": false
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        board-control@66 {
+            compatible = "fsl,bsc9132qds-fpga", "fsl,fpga-qixis-i2c";
+            reg = <0x66>;
+        };
+    };
+
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        board-control@66 {
+            compatible = "fsl,ls1028aqds-fpga", "fsl,fpga-qixis-i2c",
+                         "simple-mfd";
+            reg = <0x66>;
+
+            mux-controller {
+                compatible = "reg-mux";
+                #mux-control-cells = <1>;
+                mux-reg-masks = <0x54 0xf0>; /* 0: reg 0x54, bits 7:4 */
+            };
+        };
+    };
+
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        board-control@66 {
+            compatible = "fsl,lx2160ardb-fpga";
+            reg = <0x66>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            gpio@19 {
+                compatible = "fsl,lx2160ardb-fpga-gpio-sfp";
+                reg = <0x19>;
+                gpio-controller;
+                #gpio-cells = <2>;
+                gpio-line-names =
+                    "SFP2_TX_EN", "",
+                    "", "",
+                    "SFP2_RX_LOS", "SFP2_TX_FAULT",
+                    "", "SFP2_MOD_ABS";
+            };
+        };
+    };
diff --git a/Documentation/devicetree/bindings/board/fsl,fpga-qixis.yaml b/Documentation/devicetree/bindings/board/fsl,fpga-qixis.yaml
new file mode 100644
index 000000000..ea1e3fbca
--- /dev/null
+++ b/Documentation/devicetree/bindings/board/fsl,fpga-qixis.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/board/fsl,fpga-qixis.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale on-board FPGA/CPLD
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: fsl,p1022ds-fpga
+          - const: fsl,fpga-ngpixis
+      - items:
+          - enum:
+              - fsl,ls1088aqds-fpga
+              - fsl,ls1088ardb-fpga
+              - fsl,ls2080aqds-fpga
+              - fsl,ls2080ardb-fpga
+          - const: fsl,fpga-qixis
+      - items:
+          - enum:
+              - fsl,ls1021aqds-fpga
+              - fsl,ls1043aqds-fpga
+              - fsl,ls1043ardb-fpga
+              - fsl,ls1046aqds-fpga
+              - fsl,ls1046ardb-fpga
+              - fsl,ls208xaqds-fpga
+          - const: fsl,fpga-qixis
+          - const: simple-mfd
+      - enum:
+          - fsl,ls1043ardb-cpld
+          - fsl,ls1046ardb-cpld
+          - fsl,t1040rdb-cpld
+          - fsl,t1042rdb-cpld
+          - fsl,t1042rdb_pi-cpld
+
+  interrupts:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges:
+    maxItems: 1
+
+patternProperties:
+  '^mdio-mux@[a-f0-9,]+$':
+    $ref: /schemas/net/mdio-mux-mmioreg.yaml
+
+  '^gpio@[0-9a-f]+$':
+    type: object
+    additionalProperties: true
+
+    properties:
+      compatible:
+        contains:
+          enum:
+            - fsl,ls1046aqds-fpga-gpio-stat-pres2
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    board-control@3 {
+        compatible = "fsl,p1022ds-fpga", "fsl,fpga-ngpixis";
+        reg = <3 0x30>;
+        interrupt-parent = <&mpic>;
+        interrupts = <8 IRQ_TYPE_LEVEL_LOW 0 0>;
+    };
+
+  - |
+    board-control@3 {
+        compatible = "fsl,ls2080ardb-fpga", "fsl,fpga-qixis";
+        reg = <0x3 0x10000>;
+    };
+