x86/svm: Adjust VMCB comments

The Intercept comments provide no value whatsoever.  For the VMCB, label the
Control area and State Save area, which are the names given by the APM.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/hvm/svm/vmcb.c

@@ -430,9 +430,13 @@ static void __init __maybe_unused build_assertions(void)
 
     /* Build-time check of the VMCB layout. */
     BUILD_BUG_ON(sizeof(vmcb) != PAGE_SIZE);
+
+    /* Control area */
     BUILD_BUG_ON(offsetof(typeof(vmcb), _pause_filter_thresh) != 0x03c);
     BUILD_BUG_ON(offsetof(typeof(vmcb), _vintr)               != 0x060);
     BUILD_BUG_ON(offsetof(typeof(vmcb), event_inj)            != 0x0a8);
+
+    /* State Save area */
     BUILD_BUG_ON(offsetof(typeof(vmcb), es)                   != 0x400);
     BUILD_BUG_ON(offsetof(typeof(vmcb), _cpl)                 != 0x4cb);
     BUILD_BUG_ON(offsetof(typeof(vmcb), _cr4)                 != 0x548);

xen/arch/x86/hvm/svm/vmcb.h

@@ -8,7 +8,6 @@
 
 struct vcpu;
 
-/* general 1 intercepts */
 enum GenericIntercept1bits
 {
     GENERAL1_INTERCEPT_INTR          = 1 << 0,
@@ -45,7 +44,6 @@ enum GenericIntercept1bits
     GENERAL1_INTERCEPT_SHUTDOWN_EVT  = 1u << 31
 };
 
-/* general 2 intercepts */
 enum GenericIntercept2bits
 {
     GENERAL2_INTERCEPT_VMRUN   = 1 << 0,
@@ -65,8 +63,6 @@ enum GenericIntercept2bits
     GENERAL2_INTERCEPT_RDPRU   = 1 << 14,
 };
 
-
-/* control register intercepts */
 enum CRInterceptBits
 {
     CR_INTERCEPT_CR0_READ   = 1 << 0,
@@ -103,8 +99,6 @@ enum CRInterceptBits
     CR_INTERCEPT_CR15_WRITE = 1u << 31,
 };
 
-
-/* debug register intercepts */
 enum DRInterceptBits
 {
     DR_INTERCEPT_DR0_READ   = 1 << 0,
@@ -400,6 +394,7 @@ typedef union
 #define MSRPM_SIZE  (8  * 1024)
 
 struct vmcb_struct {
+    /* Control area */
     u32 _cr_intercepts;         /* offset 0x00 - cleanbit 0 */
     u32 _dr_intercepts;         /* offset 0x04 - cleanbit 0 */
     u32 _exception_intercepts;  /* offset 0x08 - cleanbit 0 */
@@ -491,6 +486,7 @@ struct vmcb_struct {
     u8  guest_ins[15];          /* offset 0xD1 */
     u64 res10a[100];            /* offset 0xE0 pad to save area */
 
+    /* State Save area */
     union {
         struct segment_register sreg[6];
         struct {