linux-kernel - [PATCH 2/2] lguest: handle new paravirt lazy mode (fix userspace segfaults)

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Message-Id: <1177853818.30071.182.camel@localhost.localdomain>
Date:	Sun, 29 Apr 2007 23:36:58 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	Zachary Amsden <zach@...are.com>
Subject: [PATCH 2/2] lguest: handle new paravirt lazy mode (fix userspace
	segfaults)

There's a new paravirt_lazy_mode mode in town.

Well, it's spelled "mode", but it's pronounced "hack".

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 drivers/lguest/lguest.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

===================================================================
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -59,9 +59,13 @@ static enum paravirt_lazy_mode lazy_mode
 static enum paravirt_lazy_mode lazy_mode;
 static void lguest_lazy_mode(enum paravirt_lazy_mode mode)
 {
-	lazy_mode = mode;
-	if (mode == PARAVIRT_LAZY_NONE)
+	if (mode == PARAVIRT_LAZY_FLUSH)
 		hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0);
+	else {
+		lazy_mode = mode;
+		if (mode == PARAVIRT_LAZY_NONE)
+			hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0);
+	}
 }
 
 static void lazy_hcall(unsigned long call,


-
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