linux-kernel - Re: [RFC][PATCH] virtio: 64 bit features

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Date:	Tue, 12 Apr 2011 17:45:04 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Carsten Otte <cotte@...ibm.com>, linux390@...ibm.com,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	lguest@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC][PATCH] virtio: 64 bit features

On Tue, Apr 12, 2011 at 04:04:56PM +0200, Christian Borntraeger wrote:
> Am 11.04.2011 18:55, schrieb Michael S. Tsirkin:
> 
> Looks mostly good, but 
> 
> 
> > --- a/drivers/s390/kvm/kvm_virtio.c
> > +++ b/drivers/s390/kvm/kvm_virtio.c
> > @@ -82,13 +82,13 @@ static unsigned desc_size(const struct kvm_device_desc *desc)
> >  static u32 kvm_get_features(struct virtio_device *vdev)
> 
> This should be u64.
> 

Ugh. Sure. Will fix, thanks!

> >  {
> >  	unsigned int i;
> > -	u32 features = 0;
> > +	u64 features = 0;
> >  	struct kvm_device_desc *desc = to_kvmdev(vdev)->desc;
> >  	u8 *in_features = kvm_vq_features(desc);
> > 
> > -	for (i = 0; i < min(desc->feature_len * 8, 32); i++)
> > +	for (i = 0; i < min(desc->feature_len * 8, 64); i++)
> >  		if (in_features[i / 8] & (1 << (i % 8)))
> > -			features |= (1 << i);
> > +			features |= (1ull << i);
> >  	return features;
> >  }
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