[Xen-devel] [PATCH][SVM] CPL initialization fix

[Ben Guthro <bguthro@xxxxxxxxxxxxxxx>]

CPL should be determined by code segment's DPL, not data segment's.

This solves a problem migrating a QEMU guest without PV-on-HVM drivers

Signed-off-by: Robert Plillips <rphillips@xxxxxxxxxxxxxxx>
Signed-off-by: Ben Guthro <bguthro@xxxxxxxxxxxxxxxx>

diff -r f76f151a7431 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -557,7 +557,7 @@ static void svm_set_segment_register(str
         break;
     case x86_seg_ss:
         memcpy(&vmcb->ss, reg, sizeof(*reg));
-        vmcb->cpl = vmcb->ss.attr.fields.dpl;
+        vmcb->cpl = vmcb->cs.attr.fields.dpl;
         break;
     case x86_seg_tr:
         memcpy(&vmcb->tr, reg, sizeof(*reg));

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