devices: implement MsixConfig struct and generic MSI-X functions

The MsixConfig struct is responsible for all the operations of MSI-X
Capability Structure and MSI-X Table.

A msix_config object is created for each virtio device.

BUG=chromium:854765
TEST=cargo test -p devices

Change-Id: Ide7c34d335d49a201f20b0a4307bcda97d1d61b7
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.corp-partner.google.com>
Signed-off-by: Zide Chen <zide.chen@intel.corp-partner.google.com>
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1828337
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Tested-by: Daniel Verkamp <dverkamp@chromium.org>
Commit-Queue: Stephen Barber <smbarber@chromium.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/devices/src/virtio/tpm.rs b/devices/src/virtio/tpm.rs
index 4e557dc..2267fed 100644
--- a/devices/src/virtio/tpm.rs
+++ b/devices/src/virtio/tpm.rs
@@ -13,6 +13,8 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
 use std::thread;
 
+use crate::pci::MsixConfig;
+use sync::Mutex;
 use sys_util::{error, EventFd, GuestMemory, PollContext, PollToken};
 use tpm2;
 
@@ -216,6 +218,7 @@ impl VirtioDevice for Tpm {
         mem: GuestMemory,
         interrupt_evt: EventFd,
         interrupt_resample_evt: EventFd,
+        _msix_config: Option<Arc<Mutex<MsixConfig>>>,
         interrupt_status: Arc<AtomicUsize>,
         mut queues: Vec<Queue>,
         mut queue_evts: Vec<EventFd>,