Date: Thu, 26 Jun 2014 19:19:06 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r267928 - stable/10/usr.sbin/bhyve Message-ID: <201406261919.s5QJJ68W065611@svn.freebsd.org>
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Author: jhb Date: Thu Jun 26 19:19:06 2014 New Revision: 267928 URL: http://svnweb.freebsd.org/changeset/base/267928 Log: MFC 264277: 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.) Modified: stable/10/usr.sbin/bhyve/consport.c Directory Properties: stable/10/ (props changed) Modified: stable/10/usr.sbin/bhyve/consport.c ============================================================================== --- stable/10/usr.sbin/bhyve/consport.c Thu Jun 26 17:59:23 2014 (r267927) +++ stable/10/usr.sbin/bhyve/consport.c Thu Jun 26 19:19:06 2014 (r267928) @@ -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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