On Tue, 14 Jul 2020 13:38:02 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:
> If protected virtualization is active on s390, the virtio queues are
> not accessible to the host, unless VIRTIO_F_IOMMU_PLATFORM has been
> negotiated. Use the new arch_validate_virtio_features() interface to
> fail probe if that's not the case, preventing a host error on access
> attempt.
>
> Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
> Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
> Acked-by: Halil Pasic <pasic@xxxxxxxxxxxxx>
> ---
> arch/s390/mm/init.c | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
(...)
> +int arch_validate_virtio_features(struct virtio_device *dev)
> +{
> + if (!is_prot_virt_guest())
> + return 0;
> +
> + if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
> + dev_warn(&dev->dev,
> + "legacy virtio not supported with protected virtualizatio\n");
typo: s/virtualizatio/virtualization/
> + return -ENODEV;
> + }
> +
> + if (!virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) {
> + dev_warn(&dev->dev,
> + "support for limited memory access required for protected virtualization\n");
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> /* protected virtualization */
> static void pv_init(void)
> {
