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authorStephan Gerhold <stephan.gerhold@kernkonzept.com>2022-06-21 14:06:21 +0300
committerMichael S. Tsirkin <mst@redhat.com>2022-06-27 15:05:35 +0300
commite0c2ce8217955537dd5434baeba061f209797119 (patch)
tree75700d630ab72f1f21ef3f97f8e0fe5de56e5660 /drivers/virtio/virtio_mmio.c
parented7ac37fde33ccd84e4bd2b9363c191f925364c7 (diff)
downloadlinux-e0c2ce8217955537dd5434baeba061f209797119.tar.xz
virtio_mmio: Restore guest page size on resume
Virtio devices might lose their state when the VMM is restarted after a suspend to disk (hibernation) cycle. This means that the guest page size register must be restored for the virtio_mmio legacy interface, since otherwise the virtio queues are not functional. This is particularly problematic for QEMU that currently still defaults to using the legacy interface for virtio_mmio. Write the guest page size register again in virtio_mmio_restore() to make legacy virtio_mmio devices work correctly after hibernation. Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com> Message-Id: <20220621110621.3638025-3-stephan.gerhold@kernkonzept.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio/virtio_mmio.c')
-rw-r--r--drivers/virtio/virtio_mmio.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 980dffd69586..083ff1eb743d 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -569,6 +569,9 @@ static int virtio_mmio_restore(struct device *dev)
{
struct virtio_mmio_device *vm_dev = dev_get_drvdata(dev);
+ if (vm_dev->version == 1)
+ writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE);
+
return virtio_device_restore(&vm_dev->vdev);
}