From: Pierre Morel <pmorel@linux.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: pasic@linux.ibm.com, borntraeger@de.ibm.com,
frankja@linux.ibm.com, mst@redhat.com, jasowang@redhat.com,
cohuck@redhat.com, kvm@vger.kernel.org,
linux-s390@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH] s390: protvirt: virtio: Refuse device without IOMMU
Date: Wed, 10 Jun 2020 15:11:51 +0200 [thread overview]
Message-ID: <1591794711-5915-1-git-send-email-pmorel@linux.ibm.com> (raw)
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
next reply other threads:[~2020-06-10 13:11 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-10 13:11 Pierre Morel [this message]
2020-06-10 13:24 ` [PATCH] s390: protvirt: virtio: Refuse device without IOMMU Cornelia Huck
2020-06-10 14:37 ` Pierre Morel
2020-06-10 14:53 ` Cornelia Huck
2020-06-10 15:27 ` Pierre Morel
2020-06-10 17:24 ` Halil Pasic
2020-06-11 3:10 ` Jason Wang
2020-06-12 9:21 ` Pierre Morel
2020-06-12 11:38 ` Pierre Morel
2020-06-15 3:01 ` Jason Wang
2020-06-15 10:37 ` Halil Pasic
2020-06-15 11:49 ` Pierre Morel
2020-06-15 11:50 ` Pierre Morel
2020-06-12 13:45 ` Mauricio Tavares
2020-06-12 15:15 ` Pierre Morel
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