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kvm: add detail error message when fail to add ioeventfd 

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>
This commit is contained in:
Amos Kong 2013-05-22 12:57:35 +08:00 committed by Paolo Bonzini
parent 1acd5a3739
commit fa4ba923bd
1 changed files with 4 additions and 0 deletions
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4
kvm-all.c
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@ -837,6 +837,8 @@ static void kvm_mem_ioeventfd_add(MemoryListener *listener,
data, true, int128_get64(section->size), data, true, int128_get64(section->size),
match_data); match_data);
if (r < 0) { if (r < 0) {
fprintf(stderr, "%s: error adding ioeventfd: %s\n",
__func__, strerror(-r));
abort(); abort();
} }
} }
@ -869,6 +871,8 @@ static void kvm_io_ioeventfd_add(MemoryListener *listener,
data, true, int128_get64(section->size), data, true, int128_get64(section->size),
match_data); match_data);
if (r < 0) { if (r < 0) {
fprintf(stderr, "%s: error adding ioeventfd: %s\n",
__func__, strerror(-r));
abort(); abort();
} }
} }