Re: [for-6.1 4/4] virtio-scsi: Configure all host notifiers in a single MR transaction

[Stefan Hajnoczi]

On Wed, Apr 07, 2021 at 04:35:01PM +0200, Greg Kurz wrote:
> This allows the virtio-scsi-pci device to batch the setup of all its
> host notifiers. This significantly improves boot time of VMs with a
> high number of vCPUs, e.g. from 6m5.563s down to 1m2.884s for a
> pseries machine with 384 vCPUs.
> 
> Note that memory_region_transaction_commit() must be called before
> virtio_bus_cleanup_host_notifier() because the latter might close
> ioeventfds that the transaction still assumes to be around when it
> commits.
> 
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
>  hw/scsi/virtio-scsi-dataplane.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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