crosvm: virtio-pmem device

Adds support for virtio-pmem device as an alternative for virtio-blk.

Exposing disk image to guest as virtio-blk device results in both guest
and host independently caching the disk I/O. Using virtio-pmem device
allows to mount disk image as direct access (DAX) in the guest and thus
bypass the guest cache. This will reduce memory foodprint of the VMs.

BUG=None
TEST=cargo test
TEST=Boot patched termina kernel in crosvm; mount virtio-pmem device as
DAX and run xfstests.

Change-Id: I935fc8fc7527f79e5169f07ec7927e4ea4fa6027
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1605517
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Commit-Queue: Jakub Staroń <jstaron@google.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/src/lib.rs b/arch/src/lib.rs
index 91e7ee4..71e4327 100644
--- a/arch/src/lib.rs
+++ b/arch/src/lib.rs
@@ -83,7 +83,12 @@ pub trait LinuxArch {
         create_devices: F,
     ) -> Result<RunnableLinuxVm, Self::Error>
     where
-        F: FnOnce(&GuestMemory, &EventFd) -> Result<Vec<(Box<dyn PciDevice>, Option<Minijail>)>, E>,
+        F: FnOnce(
+            &GuestMemory,
+            &mut Vm,
+            &mut SystemAllocator,
+            &EventFd,
+        ) -> Result<Vec<(Box<dyn PciDevice>, Option<Minijail>)>, E>,
         E: StdError + 'static;
 }