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Date: Mon, 05 May 2008 15:06:50 +0200
From: Martin Schwidefsky <schwidefsky@...ibm.com>
To: Avi Kivity <avi@...ranet.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Adrian Bunk <bunk@...nel.org>, Carsten Otte <cotte@...ibm.com>,
Rusty Russell <rusty@...tcorp.com.au>,
kvm-devel@...ts.sourceforge.net, linux-s390@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: s390 kvm_virtio.c build error
On Mon, 2008-05-05 at 16:00 +0300, Avi Kivity wrote:
> Christian Borntraeger wrote:
> >> Hmm... this should help:
> >>
> >> ---
> >> drivers/s390/kvm/kvm_virtio.c | 40
> >>
> > +++++++++++++++++++++++-----------------
> >
> >> 1 file changed, 23 insertions(+), 17 deletions(-)
> >>
> >
> > Thanks Heiko.
> > I did a short test and it seems to work.
> >
> > Acked-by: Christian Borntraeger <borntraeger@...ibm.com>
> >
> > This looks almost identical to Rusty's patch. Who is going to send this (or
> > Rustys) patch to Linus?
> >
>
> I can, but tell me which one. Also, the patch (Heiko's) needs a
> changelog entry and a signoff.
I've added Heiko's patch to my patchqueue. But since this is
drivers/s390/kvm this should go in over the kvm.git. See patch below.
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
---
Subject: [PATCH] kvm/s390 compile error
From: Heiko Carstens <heiko.carstens@...ibm.com>
Fix kvm compile error:
Commit c45a6816c19dee67b8f725e6646d428901a6dc24
(virtio: explicit advertisement of driver features)
and commit e976a2b997fc4ad70ccc53acfe62811c4aaec851
(s390: KVM guest: virtio device support, and kvm hypercalls)
don't like each other:
CC drivers/s390/kvm/kvm_virtio.o
drivers/s390/kvm/kvm_virtio.c:224: error: unknown field 'feature' specified in initializer
drivers/s390/kvm/kvm_virtio.c:224: warning: initialization from incompatible pointer type
make[3]: *** [drivers/s390/kvm/kvm_virtio.o] Error 1
Cc: Adrian Bunk <bunk@...nel.org>
Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---
drivers/s390/kvm/kvm_virtio.c | 40 +++++++++++++++++++++++-----------------
1 file changed, 23 insertions(+), 17 deletions(-)
diff -urpN linux-2.6/drivers/s390/kvm/kvm_virtio.c linux-2.6-patched/drivers/s390/kvm/kvm_virtio.c
--- linux-2.6/drivers/s390/kvm/kvm_virtio.c 2008-05-05 13:20:45.000000000 +0200
+++ linux-2.6-patched/drivers/s390/kvm/kvm_virtio.c 2008-05-05 13:20:48.000000000 +0200
@@ -78,27 +78,32 @@ static unsigned desc_size(const struct k
+ desc->config_len;
}
-/*
- * This tests (and acknowleges) a feature bit.
- */
-static bool kvm_feature(struct virtio_device *vdev, unsigned fbit)
+/* This gets the device's feature bits. */
+static u32 kvm_get_features(struct virtio_device *vdev)
{
+ unsigned int i;
+ u32 features = 0;
struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
- u8 *features;
+ u8 *in_features = kvm_vq_features(desc);
- if (fbit / 8 > desc->feature_len)
- return false;
+ for (i = 0; i < min(desc->feature_len * 8, 32); i++)
+ if (in_features[i / 8] & (1 << (i % 8)))
+ features |= (1 << i);
+ return features;
+}
- features = kvm_vq_features(desc);
- if (!(features[fbit / 8] & (1 << (fbit % 8))))
- return false;
+static void kvm_set_features(struct virtio_device *vdev, u32 features)
+{
+ unsigned int i;
+ struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
+ /* Second half of bitmap is features we accept. */
+ u8 *out_features = kvm_vq_features(desc) + desc->feature_len;
- /*
- * We set the matching bit in the other half of the bitmap to tell the
- * Host we want to use this feature.
- */
- features[desc->feature_len + fbit / 8] |= (1 << (fbit % 8));
- return true;
+ memset(out_features, 0, desc->feature_len);
+ for (i = 0; i < min(desc->feature_len * 8, 32); i++) {
+ if (features & (1 << i))
+ out_features[i / 8] |= (1 << (i % 8));
+ }
}
/*
@@ -221,7 +226,8 @@ static void kvm_del_vq(struct virtqueue
* The config ops structure as defined by virtio config
*/
static struct virtio_config_ops kvm_vq_configspace_ops = {
- .feature = kvm_feature,
+ .get_features = kvm_get_features,
+ .set_features = kvm_set_features,
.get = kvm_get,
.set = kvm_set,
.get_status = kvm_get_status,
--
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