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From: Alexander Motin <mav@FreeBSD.org>
Date: Mon, 16 Mar 2015 20:13:26 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r280154 - head/usr.sbin/bhyve
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Author: mav
Date: Mon Mar 16 20:13:25 2015
New Revision: 280154
URL: https://svnweb.freebsd.org/changeset/base/280154

Log:
  Report that we may have write cache, and that we do support FLUSH.
  
  FreeBSD guest driver does not use that legacy flag, but Linux seems does.
  
  MFC after:	2 weeks

Modified:
  head/usr.sbin/bhyve/pci_virtio_block.c

Modified: head/usr.sbin/bhyve/pci_virtio_block.c
==============================================================================
--- head/usr.sbin/bhyve/pci_virtio_block.c	Mon Mar 16 20:00:09 2015	(r280153)
+++ head/usr.sbin/bhyve/pci_virtio_block.c	Mon Mar 16 20:13:25 2015	(r280154)
@@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
 /* Capability bits */
 #define	VTBLK_F_SEG_MAX		(1 << 2)	/* Maximum request segments */
 #define	VTBLK_F_BLK_SIZE	(1 << 6)	/* cfg block size valid */
+#define	VTBLK_F_FLUSH		(1 << 9)	/* Cache flush support */
 #define	VTBLK_F_TOPOLOGY	(1 << 10)	/* Optimal I/O alignment */
 
 /*
@@ -72,6 +73,7 @@ __FBSDID("$FreeBSD$");
 #define VTBLK_S_HOSTCAPS      \
   ( VTBLK_F_SEG_MAX  |						    \
     VTBLK_F_BLK_SIZE |						    \
+    VTBLK_F_FLUSH    |						    \
     VTBLK_F_TOPOLOGY |						    \
     VIRTIO_RING_F_INDIRECT_DESC )	/* indirect descriptors */