[PATCH] s390: protvirt: virtio: Refuse device without IOMMU
From: Pierre Morel <hidden>
Date: 2020-06-10 13:12:03
Also in:
kvm, linux-s390, lkml
Subsystem:
s390 architecture, the rest, virtio drivers for s390 · Maintainers:
Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds, Cornelia Huck, Halil Pasic, Eric Farman
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 <redacted> --- 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