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[1/2] KVM: x86: Do not push eflags.vm on pushf

Message ID 1418203144-18434-2-git-send-email-namit@cs.technion.ac.il (mailing list archive)
State New, archived
Headers show

Commit Message

Nadav Amit Dec. 10, 2014, 9:19 a.m. UTC 
The pushf instruction does not push eflags.VM, so emulation should not do so as
well.  Although eflags.RF should not be pushed as well, it is already cleared
by the time pushf is executed.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
---
 arch/x86/kvm/emulate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 33ecfcf..5cd5401 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1863,7 +1863,7 @@  static int em_pusha(struct x86_emulate_ctxt *ctxt)
 
 static int em_pushf(struct x86_emulate_ctxt *ctxt)
 {
-	ctxt->src.val =  (unsigned long)ctxt->eflags;
+	ctxt->src.val = (unsigned long)ctxt->eflags & ~EFLG_VM;
 	return em_push(ctxt);
 }