KVM: x86: Revert NoBigReal patch in the emulator

Commit 10e38fc7cab6 ("KVM: x86: Emulator flag for instruction that only support
16-bit addresses in real mode") introduced NoBigReal for instructions such as
MONITOR. Apparetnly, the Intel SDM description that led to this patch is
misleading.  Since no instruction is using NoBigReal, it is safe to remove it,
we fully understand what the SDM means.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index e020fed0b019b3f257de80c7952e8cf89764e848..5d47714d895d5a6f7b00e44f443ee6fbe11e6a13 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -690,13 +690,7 @@ static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
                if (!fetch && (desc.type & 8) && !(desc.type & 2))
                        goto bad;
                lim = desc_limit_scaled(&desc);
-               if ((ctxt->mode == X86EMUL_MODE_REAL) && !fetch &&
-                   (ctxt->d & NoBigReal)) {
-                       /* la is between zero and 0xffff */
-                       if (la > 0xffff)
-                               goto bad;
-                       *max_size = 0x10000 - la;
-               } else if ((desc.type & 8) || !(desc.type & 4)) {
+               if ((desc.type & 8) || !(desc.type & 4)) {
                        /* expand-up segment */
                        if (addr.ea > lim)
                                goto bad;