Changeset 97562 in vbox for trunk/src/VBox/VMM/include

Timestamp:

Nov 16, 2022 2:34:26 AM (2 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

154593

Message:

VMM/HMVMX,CPUM: Added a HM/AlwaysInterceptVmxMovDRx config for controlling how we deal with DR6.RTM & DR7.RTM and similar. Current default (-1) is the old behaviour of ignoring the issue, will change that to hide these new bits in a few hours.

File:

• trunk/src/VBox/VMM/include/HMInternal.h (modified) (5 diffs)

trunk/src/VBox/VMM/include/HMInternal.h

@@ -276 +276 @@
         /** The shift mask employed by the VMX-Preemption timer (set by ring-0). */
         uint8_t                     cPreemptTimerShift;
-        bool                        fAlignment1;
 
         /** @name Configuration (gets copied if problematic)
@@ -290 +289 @@
          * quietly clears this if the hardware doesn't support the preemption timer. */
         bool                        fUsePreemptTimerCfg;
+        /** Whether to always intercept MOV DRx: 1 (always), 0 (default), -1 (lazy).
+         * In the default case it is only always intercepted when setting DR6 to 0 on
+         * the host results in a value different from X86_DR6_RA1_MASK. */
+        int8_t                      fAlwaysInterceptMovDRxCfg;
         /** @} */
 
@@ -365 +368 @@
             /** Whether to use VMCS shadowing. */
             bool                        fUseVmcsShadowing;
-            bool                        fAlignment2;
+            /** Whether MOV DRx is always intercepted or not (set by ring-0 VMX init, for
+             * logging). */
+            bool                        fAlwaysInterceptMovDRx;
 
             /** Host CR4 value (set by ring-0 VMX init, for logging). */
@@ -375 +380 @@
             /** Host IA32_FEATURE_CONTROL MSR (set by ring-0 VMX init, for logging). */
             uint64_t                    u64HostFeatCtrl;
+            /** Host zero'ed DR6 value (set by ring-0 VMX init, for logging). */
+            uint64_t                    u64HostDr6Zeroed;
 
             /** The first valid host LBR branch-from-IP stack range. */
@@ -512 +519 @@
         /** Set if Last Branch Record (LBR) is enabled. */
         bool                        fLbr;
-        bool                        afAlignment2[3];
+        /** Set always intercept MOV DRx. */
+        bool                        fAlwaysInterceptMovDRx;
+        bool                        afAlignment2[2];
 
         /** Set if VPID is supported (copy in HM::vmx::fVpidForRing3). */