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[1/5] kvm: add detail error message when fail to add ioeventfd

Message ID 1372841072-22265-2-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini July 3, 2013, 8:44 a.m. UTC 
From: Amos Kong <akong@redhat.com>

I try to hotplug 28 * 8 multiple-function devices to guest with
old host kernel, ioeventfds in host kernel will be exhausted, then
qemu fails to allocate ioeventfds for blk/nic devices.

It's better to add detail error here.

Signed-off-by: Amos Kong <akong@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
 kvm-all.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/kvm-all.c b/kvm-all.c
index c757dd2..12042f7 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -837,6 +837,8 @@  static void kvm_mem_ioeventfd_add(MemoryListener *listener,
                                data, true, int128_get64(section->size),
                                match_data);
     if (r < 0) {
+        fprintf(stderr, "%s: error adding ioeventfd: %s\n",
+                __func__, strerror(-r));
         abort();
     }
 }
@@ -869,6 +871,8 @@  static void kvm_io_ioeventfd_add(MemoryListener *listener,
                               data, true, int128_get64(section->size),
                               match_data);
     if (r < 0) {
+        fprintf(stderr, "%s: error adding ioeventfd: %s\n",
+                __func__, strerror(-r));
         abort();
     }
 }