virtio-devices: Rename control parameter for VIRTIO_F_ACCESS_PLATFORM

Rename from iommu to access_platform_enabled. The original name was
iommu as this feature was exposed for devices behind an IOMMU however
this feature is also now used for confidential VMs so adopt a more
general name.

Signed-off-by: Rob Bradford <rbradford@meta.com>

virtio-devices/src/vhost_user/blk.rs

@@ -45,7 +45,7 @@ pub struct Blk {
     guest_memory: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
     seccomp_action: SeccompAction,
     exit_evt: EventFd,
-    iommu: bool,
+    access_platform_enabled: bool,
 }
 
 impl Blk {
@@ -55,7 +55,7 @@ impl Blk {
         vu_cfg: VhostUserConfig,
         seccomp_action: SeccompAction,
         exit_evt: EventFd,
-        iommu: bool,
+        access_platform_enabled: bool,
         state: Option<State>,
     ) -> Result<Blk> {
         let num_queues = vu_cfg.num_queues;
@@ -191,7 +191,7 @@ impl Blk {
             guest_memory: None,
             seccomp_action,
             exit_evt,
-            iommu,
+            access_platform_enabled,
         })
     }
 
@@ -217,7 +217,7 @@ impl VirtioDevice for Blk {
 
     fn features(&self) -> u64 {
         let mut features = self.vu_common.virtio_common.avail_features;
-        if self.iommu {
+        if self.access_platform_enabled {
             features |= 1u64 << VIRTIO_F_ACCESS_PLATFORM;
         }
         features

virtio-devices/src/vhost_user/fs.rs

@@ -68,7 +68,7 @@ pub struct Fs {
     seccomp_action: SeccompAction,
     guest_memory: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
     exit_evt: EventFd,
-    iommu: bool,
+    access_platform_enabled: bool,
 }
 
 impl Fs {
@@ -83,7 +83,7 @@ impl Fs {
         cache: Option<(VirtioSharedMemoryList, MmapRegion)>,
         seccomp_action: SeccompAction,
         exit_evt: EventFd,
-        iommu: bool,
+        access_platform_enabled: bool,
         state: Option<State>,
     ) -> Result<Fs> {
         // Calculate the actual number of queues needed.
@@ -200,7 +200,7 @@ impl Fs {
             seccomp_action,
             guest_memory: None,
             exit_evt,
-            iommu,
+            access_platform_enabled,
         })
     }
 
@@ -226,7 +226,7 @@ impl VirtioDevice for Fs {
 
     fn features(&self) -> u64 {
         let mut features = self.vu_common.virtio_common.avail_features;
-        if self.iommu {
+        if self.access_platform_enabled {
             features |= 1u64 << VIRTIO_F_ACCESS_PLATFORM;
         }
         features

virtio-devices/src/vhost_user/generic_vhost_user.rs

@@ -42,7 +42,7 @@ pub struct GenericVhostUser {
     seccomp_action: SeccompAction,
     guest_memory: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
     exit_evt: EventFd,
-    iommu: bool,
+    access_platform_enabled: bool,
     cfg_warning: AtomicBool,
 }
 
@@ -57,7 +57,7 @@ impl GenericVhostUser {
         cache: Option<(VirtioSharedMemoryList, MmapRegion)>,
         seccomp_action: SeccompAction,
         exit_evt: EventFd,
-        iommu: bool,
+        access_platform_enabled: bool,
         state: Option<State>,
     ) -> Result<GenericVhostUser> {
         // Calculate the actual number of queues needed.
@@ -159,7 +159,7 @@ since the backend only supports {backend_num_queues}\n",
             seccomp_action,
             guest_memory: None,
             exit_evt,
-            iommu,
+            access_platform_enabled,
             cfg_warning: AtomicBool::new(false),
         })
     }
@@ -201,7 +201,7 @@ impl VirtioDevice for GenericVhostUser {
 
     fn features(&self) -> u64 {
         let mut features = self.vu_common.virtio_common.avail_features;
-        if self.iommu {
+        if self.access_platform_enabled {
             features |= 1u64 << VIRTIO_F_ACCESS_PLATFORM;
         }
         features

virtio-devices/src/vhost_user/net.rs

@@ -48,7 +48,7 @@ pub struct Net {
     ctrl_queue_epoll_thread: Option<thread::JoinHandle<()>>,
     seccomp_action: SeccompAction,
     exit_evt: EventFd,
-    iommu: bool,
+    access_platform_enabled: bool,
 }
 
 impl Net {
@@ -62,7 +62,7 @@ impl Net {
         server: bool,
         seccomp_action: SeccompAction,
         exit_evt: EventFd,
-        iommu: bool,
+        access_platform_enabled: bool,
         state: Option<State>,
         offload_tso: bool,
         offload_ufo: bool,
@@ -220,7 +220,7 @@ impl Net {
             ctrl_queue_epoll_thread: None,
             seccomp_action,
             exit_evt,
-            iommu,
+            access_platform_enabled,
         })
     }
 
@@ -252,7 +252,7 @@ impl VirtioDevice for Net {
 
     fn features(&self) -> u64 {
         let mut features = self.vu_common.virtio_common.avail_features;
-        if self.iommu {
+        if self.access_platform_enabled {
             features |= 1u64 << VIRTIO_F_ACCESS_PLATFORM;
         }
         features