Author: jhb
Date: Tue Apr 8 21:02:03 2014
New Revision: 264277
URL: http://svnweb.freebsd.org/changeset/base/264277
Log:
Handle single-byte reads from the bvmcons port (0x220) by returning
0xff. Some guests may attempt to read from this port to identify
psuedo-PNP ISA devices. (The ie(4) driver in FreeBSD/i386 is one
example.)
Reviewed by: grehan
Modified:
head/usr.sbin/bhyve/consport.c
Modified: head/usr.sbin/bhyve/consport.c
==============================================================================
--- head/usr.sbin/bhyve/consport.c Tue Apr 8 20:59:02 2014
(r264276)
+++ head/usr.sbin/bhyve/consport.c Tue Apr 8 21:02:03 2014
(r264277)
@@ -110,6 +110,15 @@ console_handler(struct vmctx *ctx, int v
return (0);
}
+ /*
+ * Guests might probe this port to look for old ISA devices
+ * using single-byte reads. Return 0xff for those.
+ */
+ if (bytes == 1 && in) {
+ *eax = 0xff;
+ return (0);
+ }
+
if (bytes != 4)
return (-1);
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