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[Qemu-devel] [PATCH v2 03/31] vl.c: daemonize before guest memory alloca

From: Igor Mammedov
Subject: [Qemu-devel] [PATCH v2 03/31] vl.c: daemonize before guest memory allocation
Date: Tue, 20 May 2014 17:15:06 +0200

memory allocated for guest before QEMU is daemonized and then mapped
later in guest's address space after it is daemonized, leads to EPT
violation and QEMU aborts.

To avoid this and similar issues switch to daemonized mode early
before processing applying/processing other options.

Signed-off-by: Igor Mammedov <address@hidden>
I haven't digged in kvm itself yet why EPT violation happens,
but fix on QEMU side looks trivial so it won't hurt to use it anyway.

there is simpler reporoducer without migration, start guest with
 '-object memory-ram,id=foo,size=1G'
when guest is up and running hotplug dimm device using 'foo' memdev
as backend.
 vl.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/vl.c b/vl.c
index cda6220..8fd4ed9 100644
--- a/vl.c
+++ b/vl.c
@@ -3963,6 +3963,8 @@ int main(int argc, char **argv, char **envp)
+    os_daemonize();
     if (qemu_init_main_loop()) {
         fprintf(stderr, "qemu_init_main_loop failed\n");
@@ -4200,8 +4202,6 @@ int main(int argc, char **argv, char **envp)
-    os_daemonize();
     if (pid_file && qemu_create_pidfile(pid_file) != 0) {

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