Index: /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp	(revision 87307)
+++ /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp	(revision 87308)
@@ -6992,4 +6992,7 @@
 #endif
     IEM_CTX_IMPORT_NORET(pVCpu, CPUMCTX_EXTRN_X87 | CPUMCTX_EXTRN_SSE_AVX | CPUMCTX_EXTRN_OTHER_XSAVE | CPUMCTX_EXTRN_XCRx);
+
+    /* Make sure any changes are loaded the next time around. */
+    pVCpu->cpum.GstCtx.CTX_SUFF(pXState)->Hdr.bmXState |= XSAVE_C_SSE;
 }
 
@@ -7030,4 +7033,7 @@
 #endif
     IEM_CTX_IMPORT_NORET(pVCpu, CPUMCTX_EXTRN_X87 | CPUMCTX_EXTRN_SSE_AVX | CPUMCTX_EXTRN_OTHER_XSAVE | CPUMCTX_EXTRN_XCRx);
+
+    /* Just assume we're going to make changes to the SSE and YMM_HI parts. */
+    pVCpu->cpum.GstCtx.CTX_SUFF(pXState)->Hdr.bmXState |= XSAVE_C_YMM | XSAVE_C_SSE;
 }