KVM: Fix the invlpg instruction emulation on AMD64

[Aurelien Jarno <aurelien-rXXEIb44qovR7s880joybQ@public.gmane.org>]

The patch below removes the check for c->modrm_reg == 7 to detect the 
invlpg instruction, as it was the case before before commit 
aa38840d3d2e0a804e628077df8d8879b496d741. This fixes the boot of FreeBSD
on an AMD64 CPU.

It also moves the assignation of c->src.bytes after the test as it is
not needed for the invlpg instruction.

Signed-off-by: Aurelien Jarno <aurelien-rXXEIb44qovR7s880joybQ@public.gmane.org>

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index fa33fcd..01aa952 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -824,12 +824,10 @@ modrm_done:
 		c->src.bytes = 4;
 		goto srcmem_common;
 	case SrcMem:
-		c->src.bytes = (c->d & ByteOp) ? 1 :
-							   c->op_bytes;
 		/* Don't fetch the address for invlpg: it could be unmapped. */
-		if (c->twobyte && c->b == 0x01
-				    && c->modrm_reg == 7)
+		if (c->twobyte && c->b == 0x01)
 			break;
+		c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
 srcmem_common:
 		c->src.type = OP_MEM;
 		break;

-- 
  .''`.  Aurelien Jarno	            | GPG: 1024D/F1BCDB73
 : :' :  Debian developer           | Electrical Engineer
 `. `'   aurel32-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org         | aurelien-rXXEIb44qovR7s880joybQ@public.gmane.org
   `-    people.debian.org/~aurel32 | www.aurel32.net

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