virtio: mem: Implement device reset

ilstam · ilstam · commit 3d6f04b0b77e · 2026-05-26T15:04:39.000+01:00
The virtio-mem device does not have any backend specific state that
needs resetting so implement the method by simply returning true.
Plugged memory regions remain intact.

Signed-off-by: Ilias Stamatis &lt;ilstam@amazon.com&gt;
diff --git a/src/vmm/src/devices/virtio/mem/device.rs b/src/vmm/src/devices/virtio/mem/device.rs
@@ -661,7 +661,14 @@ impl VirtioDevice for VirtioMem {
     }
 
     fn _reset(&mut self) -> bool {
-        false
+        // Virtio spec, section 5.15.5.2:
+        // The device MUST NOT change the state of memory blocks during device
+        // reset. The device MUST NOT modify memory or memory properties of
+        // plugged memory blocks during device reset.
+        //
+        // Note: the Linux virtio-mem driver does not support rebinding when
+        // memory is plugged
+        true
     }
 
     fn activate(

Original file line number	Diff line number	Diff line change
`@@ -661,7 +661,14 @@ impl VirtioDevice for VirtioMem {`
`661`	`661`	`}`
`662`	`662`
`663`	`663`	`fn _reset(&mut self) -> bool {`
`664`		`- false`
	`664`	`+ // Virtio spec, section 5.15.5.2:`
	`665`	`+ // The device MUST NOT change the state of memory blocks during device`
	`666`	`+ // reset. The device MUST NOT modify memory or memory properties of`
	`667`	`+ // plugged memory blocks during device reset.`
	`668`	`+ //`
	`669`	`+ // Note: the Linux virtio-mem driver does not support rebinding when`
	`670`	`+ // memory is plugged`
	`671`	`+ true`
`665`	`672`	`}`
`666`	`673`
`667`	`674`	`fn activate(`