I simply defined the syscall myself - but this only works if your kernel supports the eventfd syscall.
Note: You need to adjust the the syscall NR for your architecture.
-------------------------------------------------------------------------------------
glibc < 2.8 does not have eventfd support. So we define the
syscall manually. That is required for vhost=on.
Index: new/hw/event_notifier.c
===================================================================
--- new.orig/hw/event_notifier.c 2011-03-01 12:16:30.000000000 +0100
+++ new/hw/event_notifier.c 2011-03-01 12:36:02.000000000 +0100
@@ -14,6 +14,13 @@
#include "event_notifier.h"
#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
+#else
+#include <sys/syscall.h>
+#include <unistd.h>
+/* this is for AMD64 */
+#define __NR_eventfd2 290
+#define EFD_NONBLOCK 04000
+#define EFD_CLOEXEC 02000000
#endif
int event_notifier_init(EventNotifier *e, int active)
@@ -25,7 +32,11 @@
e->fd = fd;
return 0;
#else
- return -ENOSYS;
+ int fd = syscall(__NR_eventfd2, !!active, EFD_NONBLOCK | EFD_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+ e->fd = fd;
+ return 0;
#endif
}
> -----Original Message-----
> From: Nikola Ciprich [mailto:extmaillist@xxxxxxxxxxx]
> Sent: Montag, 21. März 2011 21:48
> To: Dietmar Maurer
> Cc: kvm@xxxxxxxxxxxxxxx; nikola.ciprich@xxxxxxxxxxx
> Subject: Re: qemu-kvm-0.14.0 msix_mask_notifier failed.
>
> Hello Dietmar,
> did You somehow fixed this problem?
> BR
> nik
>
> On Tue, Mar 01, 2011 at 11:43:39AM +0000, Dietmar Maurer wrote:
> > Seems the bug is related to EVENTFD support.
> >
> > int event_notifier_init(EventNotifier *e, int active)
> >
> > That simply return -ENOSYS on older glibc (< 2.8)
> >
> > I can define the syscall manually, but I wonder if there is a better way?
> >
> > - Dietmar
> >
> >
> > > I get this error when I run new kvm 0.14.0 on kernel 2.6.35 (vhost=on):
> > >
> > > # kvm -netdev type=tap,id=n0,vhost=on -device
> > > virtio-net-pci,netdev=n0 -cdrom ubuntu-10.10-desktop-amd64.iso
> > >
> > > kvm: /home/code/qemu-kvm/hw/msix.c:639: msix_unset_mask_notifier:
> > > Assertion `dev->msix_mask_notifier' failed.
> > >
> > > Any ideas?
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