diff options
| author | Pavel Fedin <p.fedin@samsung.com> | 2015-11-20 12:37:16 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-12-17 15:24:34 +0100 |
| commit | 8c56c1a592b5092d91da8d8943c17777d6462a6f (patch) | |
| tree | 63ad5cd60370b1cdf26ff80b5c472658952d540f /CODING_STYLE | |
| parent | bc92e4e97ed62efa61ba983f57dfe33f10fe1d88 (diff) | |
memory: emulate ioeventfd
The ioeventfd mechanism is used by vhost, dataplane, and virtio-pci to
turn guest MMIO/PIO writes into eventfd file descriptor events. This
allows arbitrary threads to be notified when the guest writes to a
specific MMIO/PIO address.
qtest and TCG do not support ioeventfd because memory writes are not
checked against registered ioeventfds in QEMU. This patch implements
this in memory_region_dispatch_write() so qtest can use ioeventfd.
Also this patch fixes vhost aborting on some misconfigured old kernels
like 3.18.0 on ARM. It is possible to explicitly enable CONFIG_EVENTFD
in expert settings, while MMIO binding support in KVM will still be
missing.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Message-Id: <006e01d12377$0b9c2d40$22d487c0$@samsung.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'CODING_STYLE')
0 files changed, 0 insertions, 0 deletions