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| 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 /include/hw/compat.h | |
| parent | bc92e4e97ed62efa61ba983f57dfe33f10fe1d88 (diff) | |
| download | focaccia-qemu-8c56c1a592b5092d91da8d8943c17777d6462a6f.tar.gz focaccia-qemu-8c56c1a592b5092d91da8d8943c17777d6462a6f.zip | |
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 'include/hw/compat.h')
0 files changed, 0 insertions, 0 deletions