* [PATCH] firmware: arm_scmi: Make virtio Version_1 compliance optional
@ 2021-11-15 10:29 Cristian Marussi
2021-11-25 12:39 ` Sudeep Holla
0 siblings, 1 reply; 2+ messages in thread
From: Cristian Marussi @ 2021-11-15 10:29 UTC (permalink / raw)
To: linux-kernel, linux-arm-kernel, virtualization, virtio-dev
Cc: sudeep.holla, vincent.guittot, souvik.chakravarty, igor.skalkin,
peter.hilber, Cristian Marussi
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(-)
diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig
index 3d7081e84853..1e6c4659b640 100644
--- a/drivers/firmware/arm_scmi/Kconfig
+++ b/drivers/firmware/arm_scmi/Kconfig
@@ -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
diff --git a/drivers/firmware/arm_scmi/virtio.c b/drivers/firmware/arm_scmi/virtio.c
index c8cab5652daf..bcfc4474535b 100644
--- a/drivers/firmware/arm_scmi/virtio.c
+++ b/drivers/firmware/arm_scmi/virtio.c
@@ -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;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] firmware: arm_scmi: Make virtio Version_1 compliance optional
2021-11-15 10:29 [PATCH] firmware: arm_scmi: Make virtio Version_1 compliance optional Cristian Marussi
@ 2021-11-25 12:39 ` Sudeep Holla
0 siblings, 0 replies; 2+ messages in thread
From: Sudeep Holla @ 2021-11-25 12:39 UTC (permalink / raw)
To: virtio-dev, linux-arm-kernel, Cristian Marussi, virtualization,
linux-kernel
Cc: Sudeep Holla, souvik.chakravarty, igor.skalkin, vincent.guittot,
peter.hilber
On Mon, 15 Nov 2021 10:29:10 +0000, Cristian Marussi wrote:
> 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.
>
>
Applied to sudeep.holla/linux (for-next/scmi), thanks!
[1/1] firmware: arm_scmi: Make virtio Version_1 compliance optional
https://git.kernel.org/sudeep.holla/c/530897ecdb
--
Regards,
Sudeep
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-11-25 12:41 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-11-15 10:29 [PATCH] firmware: arm_scmi: Make virtio Version_1 compliance optional Cristian Marussi
2021-11-25 12:39 ` Sudeep Holla
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).