virtio-balloon: allow hypervisor refuse locking some pages
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From: Avi Kivity on 20 Mar 2010 09:10 On 03/19/2010 10:46 PM, Dmitry Torokhov wrote: > Some hypervisors may refuse our request to lock pages in certain > circumstances. For example, VMware may decide that the target balloon > size decreased since it was last communicated to the guest and thus > current page should not be locked. > > > static struct virtio_driver virtio_balloon_driver = { > diff --git a/include/linux/virtio_balloon.h b/include/linux/virtio_balloon.h > index a50ecd1..4baad1c 100644 > --- a/include/linux/virtio_balloon.h > +++ b/include/linux/virtio_balloon.h > @@ -6,12 +6,16 @@ > #include<linux/virtio_config.h> > > /* The feature bitmap for virtio balloon */ > -#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ > -#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ > +#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ > +#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ > +#define VIRTIO_BALLOON_F_HOST_MAY_REFUSE 2 /* Host may refuse some pages */ > > /* Size of a PFN in the balloon interface. */ > #define VIRTIO_BALLOON_PFN_SHIFT 12 > > +#define VIRTIO_BALLOON_PFN_OK 0 > +#define VIRTIO_BALLOON_PFN_FAIL 1 > + > struct virtio_balloon_config > { > /* Number of pages host wants Guest to give up. */ > Please update the virtio pci spec (can't find the URL - Rusty?) to reflect the protocol change. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |