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Message-ID: <1417449619-24896-6-git-send-email-mst@redhat.com>
Date: Mon, 1 Dec 2014 18:03:10 +0200
From: "Michael S. Tsirkin" <mst@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: David Miller <davem@...emloft.net>, cornelia.huck@...ibm.com,
rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
thuth@...ux.vnet.ibm.com, dahi@...ux.vnet.ibm.com,
Rusty Russell <rusty@...tcorp.com.au>,
Ohad Ben-Cohen <ohad@...ery.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Ashutosh Dixit <ashutosh.dixit@...el.com>,
Siva Yerramreddy <yshivakrishna@...il.com>,
lguest@...ts.ozlabs.org, linux-s390@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Subject: [PATCH v8 05/50] virtio: assert 32 bit features in transports
At this point, no transports set any of the high 32 feature bits.
Since transports generally can't (yet) cope with such bits, add BUG_ON
checks to make sure they are not set by mistake.
Based on rproc patch by Rusty.
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Reviewed-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>
---
drivers/lguest/lguest_device.c | 3 +++
drivers/misc/mic/card/mic_virtio.c | 3 +++
drivers/remoteproc/remoteproc_virtio.c | 3 +++
drivers/s390/kvm/kvm_virtio.c | 3 +++
drivers/s390/kvm/virtio_ccw.c | 3 +++
drivers/virtio/virtio_mmio.c | 3 +++
drivers/virtio/virtio_pci.c | 3 +++
7 files changed, 21 insertions(+)
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index d81170a..9b77b66 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -136,6 +136,9 @@ static void lg_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
+ /* Make sure we don't have any features > 32 bits! */
+ BUG_ON((u32)vdev->features != vdev->features);
+
/*
* Since lguest is currently x86-only, we're little-endian. That
* means we could just memcpy. But it's not time critical, and in
diff --git a/drivers/misc/mic/card/mic_virtio.c b/drivers/misc/mic/card/mic_virtio.c
index f5e7561..d027d29 100644
--- a/drivers/misc/mic/card/mic_virtio.c
+++ b/drivers/misc/mic/card/mic_virtio.c
@@ -96,6 +96,9 @@ static void mic_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
+ /* Make sure we don't have any features > 32 bits! */
+ BUG_ON((u32)vdev->features != vdev->features);
+
memset_io(out_features, 0, feature_len);
bits = min_t(unsigned, feature_len,
sizeof(vdev->features)) * 8;
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 62897db..627737e 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -227,6 +227,9 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features */
vring_transport_features(vdev);
+ /* Make sure we don't have any features > 32 bits! */
+ BUG_ON((u32)vdev->features != vdev->features);
+
/*
* Remember the finalized features of our vdev, and provide it
* to the remote processor once it is powered on.
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 2336c7e..f5575cc 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -103,6 +103,9 @@ static void kvm_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
+ /* Make sure we don't have any features > 32 bits! */
+ BUG_ON((u32)vdev->features != vdev->features);
+
memset(out_features, 0, desc->feature_len);
bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
for (i = 0; i < bits; i++) {
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index 56d7895..244d611 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -714,6 +714,9 @@ static void virtio_ccw_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
+ /* Make sure we don't have any features > 32 bits! */
+ BUG_ON((u32)vdev->features != vdev->features);
+
features->index = 0;
features->features = cpu_to_le32(vdev->features);
/* Write the feature bits to the host. */
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index c63d0ef..aec1dae 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -159,6 +159,9 @@ static void vm_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
+ /* Make sure we don't have any features > 32 bits! */
+ BUG_ON((u32)vdev->features != vdev->features);
+
writel(0, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
writel(vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
}
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 7e0efa7..dd6df97 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -119,6 +119,9 @@ static void vp_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
+ /* Make sure we don't have any features > 32 bits! */
+ BUG_ON((u32)vdev->features != vdev->features);
+
/* We only support 32 feature bits. */
iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
}
--
MST
--
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