Hi,
From: Cindy Lu <l...@redhat.com>
Add support for configure interrupt, The process is used kvm_irqfd_assign
to set the gsi to kernel. When the configure notifier was signal by
host, qemu will inject a msix interrupt to guest
Signed-off-by: Cindy Lu <l...@redhat.com>
Message-Id: <20211104164827.21911-11-l...@redhat.com>
Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
---
hw/virtio/virtio-pci.h | 4 +-
hw/virtio/virtio-pci.c | 92 ++++++++++++++++++++++++++++++++++++------
2 files changed, 83 insertions(+), 13 deletions(-)
Since this commit I see the following warnings.
With -drive
if=virtio,id=disk1,file=/srv/cdimg/Linux/images/opensuse.qcow2,discard=unmap
qemu-system-x86_64: virtio-blk failed to set guest notifier (-16),
ensure -accel kvm is set.
qemu-system-x86_64: virtio_bus_start_ioeventfd: failed. Fallback to
userspace (slower).
With libvirt
<controller type='pci' index='1' model='pcie-root-port'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1c'
function='0'
multifunction='on'/>
</controller>
<controller type='pci' index='2' model='pcie-root-port'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1c'
function='1'/>
</controller>
<controller type='scsi' index='0' model='virtio-scsi'>
<driver queues='4'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00'
function='0'/>
</controller>
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none' discard='unmap'
io='io_uring'/>
<source dev='/dev/vgtmp/lnxpowerm1'/>
<target dev='sda' bus='scsi'/>
<address type='drive' controller='0' bus='0' unit='0'/>
<boot order='1'/>
</disk>
2022-01-08T17:45:26.911491Z qemu-system-x86_64: virtio-scsi: Failed to
set guest notifiers (-16), ensure -accel kvm is set.
2022-01-08T17:45:26.911505Z qemu-system-x86_64:
virtio_bus_start_ioeventfd: failed. Fallback to userspace (slower).
The messages appear around the time the Linux guest initializes the drivers.
With best regards,
Volker
