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virtio-balloon: Disable free page reporting if page poison reporting is not enabled

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We should disable free page reporting if page poisoning is enabled but we
cannot report it via the balloon interface. This way we can avoid the
possibility of corrupting guest memory. Normally the page poisoning feature
should always be present when free page reporting is enabled on the
hypervisor, however this allows us to correctly handle a case of the
virtio-balloon device being possibly misconfigured.

Fixes: 5d757c8d518d ("virtio-balloon: add support for providing free page reports to host")
Cc: stable@vger.kernel.org
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Link: https://lore.kernel.org/r/20200508173732.17877.85060.stgit@localhost.localdomain
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alexander Duyck 2020-05-08 10:40:06 -07:00 committed by Michael S. Tsirkin
parent 4b4e4867d9
commit fb69c2c896
1 changed files with 8 additions and 1 deletions
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9
drivers/virtio/virtio_balloon.c
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@ -1107,11 +1107,18 @@ static int virtballoon_restore(struct virtio_device *vdev)
static int virtballoon_validate(struct virtio_device *vdev)
{
/* Tell the host whether we care about poisoned pages. */
/*
* Inform the hypervisor that our pages are poisoned or
* initialized. If we cannot do that then we should disable
* page reporting as it could potentially change the contents
* of our free pages.
*/
if (!want_init_on_free() &&
(IS_ENABLED(CONFIG_PAGE_POISONING_NO_SANITY) ||
!page_poisoning_enabled()))
__virtio_clear_bit(vdev, VIRTIO_BALLOON_F_PAGE_POISON);
else if (!virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON))
__virtio_clear_bit(vdev, VIRTIO_BALLOON_F_REPORTING);
__virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM);
return 0;