@@ -77,6 +77,20 @@ config ARM_SCMI_TRANSPORT_VIRTIO
If you want the ARM SCMI PROTOCOL stack to include support for a
transport based on VirtIO, answer Y.
+config ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE
+ bool "SCMI VirtIO transport Version 1 compliance"
+ depends on ARM_SCMI_TRANSPORT_VIRTIO
+ default y
+ help
+ This enforces strict compliance with VirtIO Version 1 specification.
+
+ If you want the ARM SCMI VirtIO transport layer to refuse to work
+ with Legacy VirtIO backends and instead support only VirtIO Version 1
+ devices (or above), answer Y.
+ If you want instead to support also old Legacy VirtIO backends (like
+ the ones implemented by kvmtool) and let the core Kernel VirtIO layer
+ take care of the needed conversions, say N.
+
endif #ARM_SCMI_PROTOCOL
config ARM_SCMI_POWER_DOMAIN
@@ -459,12 +459,13 @@ static void scmi_vio_remove(struct virtio_device *vdev)
static int scmi_vio_validate(struct virtio_device *vdev)
{
+#ifdef CONFIG_ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
dev_err(&vdev->dev,
"device does not comply with spec version 1.x\n");
return -EINVAL;
}
-
+#endif
return 0;
}
Introduce a compilation option to disable strict enforcement of compliance against VirtIO Version_1 backends, so as to allow to support also Legacy VirtIO devices implementations. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> --- drivers/firmware/arm_scmi/Kconfig | 14 ++++++++++++++ drivers/firmware/arm_scmi/virtio.c | 3 ++- 2 files changed, 16 insertions(+), 1 deletion(-)