diff options
| author | Jason Wang <jasowang@redhat.com> | 2021-03-08 12:49:19 +0800 |
|---|---|---|
| committer | Jason Wang <jasowang@redhat.com> | 2021-03-15 16:41:22 +0800 |
| commit | 51a81a2118df0c70988f00d61647da9e298483a4 (patch) | |
| tree | fff15fbe6a331398e261ad6497ac3a8a23734aae /hw/core/machine.c | |
| parent | 6157b0e19721aadb4c7fdcfe57b2924af6144b14 (diff) | |
virtio-net: calculating proper msix vectors on init
Currently, the default msix vectors for virtio-net-pci is 3 which is
obvious not suitable for multiqueue guest, so we depends on the user
or management tools to pass a correct vectors parameter. In fact, we
can simplifying this by calculating the number of vectors on realize.
Consider we have N queues, the number of vectors needed is 2*N + 2
(#queue pairs + plus one config interrupt and control vq). We didn't
check whether or not host support control vq because it was added
unconditionally by qemu to avoid breaking legacy guests such as Minix.
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'hw/core/machine.c')
| -rw-r--r-- | hw/core/machine.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/core/machine.c b/hw/core/machine.c index 4386f57b5c..979133f8b7 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -39,6 +39,7 @@ GlobalProperty hw_compat_5_2[] = { { "ICH9-LPC", "smm-compat", "on"}, { "PIIX4_PM", "smm-compat", "on"}, + { "virtio-net-pci", "vectors", "3"}, }; const size_t hw_compat_5_2_len = G_N_ELEMENTS(hw_compat_5_2); |