Messages in this thread Patch in this message | | | From | Pierre Morel <> | Subject | [PATCH] s390: protvirt: virtio: Refuse device without IOMMU | Date | Wed, 10 Jun 2020 15:11:51 +0200 |
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Protected Virtualisation protects the memory of the guest and do not allow a the host to access all of its memory.
Let's refuse a VIRTIO device which does not use IOMMU protected access.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> --- drivers/s390/virtio/virtio_ccw.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c index 5730572b52cd..06ffbc96587a 100644 --- a/drivers/s390/virtio/virtio_ccw.c +++ b/drivers/s390/virtio/virtio_ccw.c @@ -986,6 +986,11 @@ static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) if (!ccw) return; + /* Protected Virtualisation guest needs IOMMU */ + if (is_prot_virt_guest() && + !__virtio_test_bit(vdev, VIRTIO_F_IOMMU_PLATFORM)) + status &= ~VIRTIO_CONFIG_S_FEATURES_OK; + /* Write the status to the host. */ vcdev->dma_area->status = status; ccw->cmd_code = CCW_CMD_WRITE_STATUS; -- 2.25.1
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