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,
thomas.lendacky@amd.com, david@gibson.dropbear.id.au,
linuxram@us.ibm.com, heiko.carstens@de.ibm.com,
gor@linux.ibm.com
Subject: [PATCH v5 2/2] s390: virtio: PV needs VIRTIO I/O device protection
Date: Thu, 9 Jul 2020 10:39:19 +0200 [thread overview]
Message-ID: <1594283959-13742-3-git-send-email-pmorel@linux.ibm.com> (raw)
In-Reply-To: <1594283959-13742-1-git-send-email-pmorel@linux.ibm.com>
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@linux.ibm.com>
---
arch/s390/mm/init.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 6dc7c3b60ef6..b8e6f90117da 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -45,6 +45,7 @@
#include <asm/kasan.h>
#include <asm/dma-mapping.h>
#include <asm/uv.h>
+#include <linux/virtio_config.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
@@ -161,6 +162,32 @@ bool force_dma_unencrypted(struct device *dev)
return is_prot_virt_guest();
}
+/*
+ * arch_validate_virtio_features
+ * @dev: the VIRTIO device being added
+ *
+ * Return an error if required features are missing on a guest running
+ * with protected virtualization.
+ */
+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, "device must provide VIRTIO_F_VERSION_1\n");
+ return -ENODEV;
+ }
+
+ if (!virtio_has_feature(dev, VIRTIO_F_IOMMU_PLATFORM)) {
+ dev_warn(&dev->dev,
+ "device must provide VIRTIO_F_IOMMU_PLATFORM\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
/* protected virtualization */
static void pv_init(void)
{
--
2.25.1
next prev parent reply other threads:[~2020-07-09 8:39 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-09 8:39 [PATCH v5 0/2] s390: virtio: let arch validate VIRTIO features Pierre Morel
2020-07-09 8:39 ` [PATCH v5 1/2] " Pierre Morel
2020-07-09 9:58 ` Halil Pasic
2020-07-09 10:48 ` Pierre Morel
2020-07-09 8:39 ` Pierre Morel [this message]
2020-07-09 8:57 ` [PATCH v5 2/2] s390: virtio: PV needs VIRTIO I/O device protection Cornelia Huck
2020-07-09 9:55 ` Halil Pasic
2020-07-09 10:58 ` Pierre Morel
2020-07-09 10:51 ` Pierre Morel
2020-07-09 14:47 ` Halil Pasic
2020-07-09 14:51 ` Pierre Morel
2020-07-09 15:06 ` Halil Pasic
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