linux-kernel - [PATCH v4 04/42] virtio: disable virtio 1.0 in transports

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Date:	Tue, 25 Nov 2014 18:41:35 +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,
	Rusty Russell <rusty@...tcorp.com.au>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Pawel Moll <pawel.moll@....com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Sudeep Dutt <sudeep.dutt@...el.com>,
	Ashutosh Dixit <ashutosh.dixit@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nikhil Rao <nikhil.rao@...el.com>,
	Siva Yerramreddy <yshivakrishna@...il.com>,
	lguest@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH v4 04/42] virtio: disable virtio 1.0 in transports

disable virtio 1.0 in transports that don't
support it yet.
We will gradually re-enable as support is added.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/lguest/lguest_device.c     | 3 ++-
 drivers/misc/mic/card/mic_virtio.c | 2 ++
 drivers/s390/kvm/virtio_ccw.c      | 3 ++-
 drivers/virtio/virtio_mmio.c       | 2 ++
 4 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 4d29bcd..4deaf88 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -106,7 +106,8 @@ static u64 lg_get_features(struct virtio_device *vdev)
 		if (in_features[i / 8] & (1 << (i % 8)))
 			features |= (1ULL << i);
 
-	return features;
+	/* lguest is not in virtio 1.0 */
+	return features & ~BIT_ULL(VIRTIO_F_VERSION_1);
 }
 
 /*
diff --git a/drivers/misc/mic/card/mic_virtio.c b/drivers/misc/mic/card/mic_virtio.c
index 6d94f04..edc77f1 100644
--- a/drivers/misc/mic/card/mic_virtio.c
+++ b/drivers/misc/mic/card/mic_virtio.c
@@ -82,6 +82,8 @@ static u64 mic_get_features(struct virtio_device *vdev)
 		if (ioread8(&in_features[i / 8]) & (BIT_ULL(i % 8)))
 			features |= BIT_ULL(i);
 
+	/* MIC is not in virtio 1.0, disable it for now. */
+	features &= ~BIT_ULL(VIRTIO_F_VERSION_1);
 	return features;
 }
 
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index abba04d..08536f0 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -704,7 +704,8 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev)
 out_free:
 	kfree(features);
 	kfree(ccw);
-	return rc;
+	/* TODO: enable virtio 1.0 */
+	return rc & ~BIT_ULL(VIRTIO_F_VERSION_1);;
 }
 
 static void virtio_ccw_finalize_features(struct virtio_device *vdev)
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index fd01c6d..e1d38a9 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -151,6 +151,8 @@ static u64 vm_get_features(struct virtio_device *vdev)
 	features = readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES);
 	writel(1, vm_dev->base + VIRTIO_MMIO_HOST_FEATURES_SEL);
 	features |= ((u64)readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES) << 32);
+	/* TODO: enable virtio 1.0 support */
+	features &= ~BIT_ULL(VIRTIO_F_VERSION_1);
 	return features;
 }
 
-- 
MST

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