From a16c53b101a9897b0b2be96a1bb3bde7c04380f2 Mon Sep 17 00:00:00 2001
From: Anthony Liguori <aliguori@us.ibm.com>
Date: Mon, 6 Jun 2011 08:25:06 -0500
Subject: [PATCH] Fix regression introduced by -machine accel=
Commit 85097db6 changed the timing when kvm_allowed is set until after
kvm is initialized. During initialization, the ioeventfd initialization code
checks kvm_enabled() and after this change, ioeventfd is effectively disabled.
This causes a significant regression in performance.
Fix this by setting kvm_allowed before calling init.
Reported-by: Khoa Huynh <khoa@us.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
vl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/vl.c b/vl.c
index b362871089..11f6386101 100644
--- a/vl.c
+++ b/vl.c
@@ -1933,6 +1933,7 @@ static int configure_accelerator(void)
p = get_opt_name(buf, sizeof (buf), p, ':');
for (i = 0; i < ARRAY_SIZE(accel_list); i++) {
if (strcmp(accel_list[i].opt_name, buf) == 0) {
+ *(accel_list[i].allowed) = 1;
ret = accel_list[i].init();
if (ret < 0) {
init_failed = 1;
@@ -1944,9 +1945,9 @@ static int configure_accelerator(void)
accel_list[i].name,
strerror(-ret));
}
+ *(accel_list[i].allowed) = 0;
} else {
accel_initalised = 1;
- *(accel_list[i].allowed) = 1;
}
break;
}
--
2.30.2