From 6d7eeb7a1328fcce82b5783d9e4605bf5e4737dd Mon Sep 17 00:00:00 2001
From: Sasha Levin <sasha.levin@oracle.com>
Date: Tue, 20 Oct 2015 23:32:33 -0400
Subject: [PATCH] kvmtool: set 9p caching mode to support writable mmaps

9p doesn't support writable mmaps by default (when cache=none), set it to
loose caching to allow for writable mmaps.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
 builtin-run.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin-run.c b/builtin-run.c
index 6e4491c..d7d3afd 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -590,7 +590,7 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
 	}
 
 	if (kvm->cfg.using_rootfs) {
-		strcat(real_cmdline, " rw rootflags=trans=virtio,version=9p2000.L rootfstype=9p");
+		strcat(real_cmdline, " rw rootflags=trans=virtio,version=9p2000.L,cache=loose rootfstype=9p");
 		if (kvm->cfg.custom_rootfs) {
 			kvm_run_set_sandbox(kvm);