Changeset 71446 in vbox for trunk/src/VBox

Timestamp:

Mar 22, 2018 10:50:35 AM (7 years ago)

Author:

vboxsync

Message:

VMM/HMSVMR0: Use #MF exception and CR0.NE=1 method of handling legacy-FPU error handling.

File:

• trunk/src/VBox/VMM/VMMR0/HMSVMR0.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR0/HMSVMR0.cpp

@@ -1443 +1443 @@
                    |  X86_CR0_WP;     /* Guest CPL 0 writes to its read-only pages should cause a #PF #VMEXIT. */
     }
+
+    /*
+     * Use the #MF style of legacy-FPU error reporting for now as IEM needs work
+     * if we want to fully emulate it properly. AMD-V has MSRs that lets us isolate
+     * the host from it, but IEM needs work, see @bugref{7243#c103}.
+     */
+    if (!(uGuestCr0 & X86_CR0_NE))
+    {
+        uShadowCr0 |= X86_CR0_NE;
+        hmR0SvmAddXcptIntercept(pVmcb, X86_XCPT_MF);
+    }
+    else
+        hmR0SvmRemoveXcptIntercept(pVCpu, pCtx, pVmcb, X86_XCPT_MF);
 
     /*