devices: virtio: enable MSI-X for all devices

All virtio devices can use the same generic calculation for number of
MSI-X vectors required: number of queues plus one for configuration
changes.  Move this calculation to the VirtioPciDevice implementation
and remove the Option to unconditionally enable MSI-X support for all
PCI virtio devices.

BUG=chromium:854765
TEST=Verify all virtio interrupts in /proc/interrupts are PCI-MSI

Change-Id: I5905ab52840e7617b0b342ec6ca3f75dccd16e4d
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1925169
Reviewed-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/devices/src/virtio/fs/mod.rs b/devices/src/virtio/fs/mod.rs
index 0442bad..a1f8868 100644
--- a/devices/src/virtio/fs/mod.rs
+++ b/devices/src/virtio/fs/mod.rs
@@ -192,10 +192,6 @@ impl VirtioDevice for Fs {
         TYPE_FS
     }
 
-    fn msix_vectors(&self) -> u16 {
-        self.queue_sizes.len() as u16
-    }
-
     fn queue_max_sizes(&self) -> &[u16] {
         &self.queue_sizes
     }