Changeset 73771 in vbox for trunk/include

Timestamp:

Aug 20, 2018 7:52:39 AM (6 years ago)

Author:

vboxsync

Message:

hm_vmx.h: Nested VMX: bugref:9180 Define VMCS field widths, add inline function for getting the width given the encoding.

File:

• trunk/include/VBox/vmm/hm_vmx.h (modified) (3 diffs)

trunk/include/VBox/vmm/hm_vmx.h

@@ -1115 +1115 @@
 typedef const VMXMSRS *PCVMXMSRS;
 
-
 /** @name VMX Basic Exit Reasons.
  * @{
@@ -1781 +1780 @@
 
 
+/** @name VMCS field encoding: Widths
+ * @{ */
+typedef enum
+{
+    VMXVMCSFIELDWIDTH_16BIT = 0,
+    VMXVMCSFIELDWIDTH_64BIT,
+    VMXVMCSFIELDWIDTH_32BIT,
+    VMXVMCSFIELDWIDTH_NATURAL
+} VMXVMCSFIELDWIDTH;
+AssertCompileSize(VMXVMCSFIELDWIDTH, 4);
+/** @} */
+
+
 /** @name Pin-based VM-execution controls.
  * @{
@@ -2810 +2822 @@
 
 
+/** @defgroup grp_hm_vmx_inline    VMX Inline Helpers
+ * @{
+ */
+/**
+ * Gets the width of a VMCS field given it's encoding.
+ *
+ * @returns The VMCS field width.
+ * @param   uFieldEnc   The VMCS field encoding.
+ *
+ * @remarks Warning! This function does not verify the encoding is for a valid and
+ *          supported VMCS field.
+ */
+DECLINLINE(uint32_t) HMVmxGetVmcsFieldWidth(uint32_t uFieldEnc)
+{
+    /* Only the "HIGH" parts of all 64-bit fields have bit 0 set. */
+    if (uFieldEnc & RT_BIT(0))
+        return VMXVMCSFIELDWIDTH_32BIT;
+
+    /* Bits 13:14 contains the width of the VMCS field, see VMXVMCSFIELDWIDTH_XXX. */
+    return (uFieldEnc >> 13) & 0x3;
+}
+/** @} */
+
+
 /** @defgroup grp_hm_vmx_asm    VMX Assembly Helpers
  * @{