linux/drivers/virtio, branch v3.4.33

virtio: force vring descriptors to be allocated from lowmem

2013-01-11T17:06:47Z

commit b92b1b89a33c172c075edccf6afb0edc41d851fd upstream. Virtio devices may attempt to add descriptors to a virtqueue from atomic context using GFP_ATOMIC allocation. This is problematic because such allocations can fall outside of the lowmem mapping, causing virt_to_phys to report bogus physical addresses which are subsequently passed to userspace via the buffers for the virtual device. This patch masks out __GFP_HIGH and __GFP_HIGHMEM from the requested flags when allocating descriptors for a virtqueue. If an atomic allocation is requested and later fails, we will return -ENOSPC which will be handled by the driver. Signed-off-by: Will Deacon Cc: Sasha Levin Signed-off-by: Rusty Russell Signed-off-by: Greg Kroah-Hartman

virtio: balloon: let host know of updated balloon size before module removal

2012-05-17T09:14:34Z

When the balloon module is removed, we deflate the balloon, reclaiming all the pages that were given to the host. However, we don't update the config values for the new balloon size, resulting in the host showing outdated balloon values. The size update is done after each leak and fill operation, only the module removal case was left out. Signed-off-by: Amit Shah Signed-off-by: Michael S. Tsirkin

virtio_balloon: fix handling of PAGE_SIZE != 4k

2012-04-15T08:51:06Z

As reported by David Gibson, current code handles PAGE_SIZE != 4k completely wrong which can lead to guest memory corruption errors: - page_to_balloon_pfn is wrong: e.g. on system with 64K page size it gives the same pfn value for 16 different pages. - we also need to convert back to linux pfns when we free. - for each linux page we need to tell host about multiple balloon pages, but code only adds one pfn to the array. This patch fixes all that, tested with a 64k ppc64 kernel. Reported-by: David Gibson Tested-by: David Gibson Signed-off-by: Michael S. Tsirkin

virtio_balloon: Fix endian bug

2012-04-15T08:51:05Z

Although virtio config space fields are usually in guest-native endian, the spec for the virtio balloon device explicitly states that both fields in its config space are little-endian. However, the current virtio_balloon driver does not have a suitable endian swap for the 'num_pages' field, although it does have one for the 'actual' field. This patch corrects the bug, adding sparse annotation while we're at it. Signed-off-by: David Gibson Signed-off-by: Michael S. Tsirkin

virtio-pci: switch to PM ops macro to initialise PM functions

2012-03-31T02:39:51Z

Use the SET_SYSTEM_SLEEP_PM_OPS macro to initialise the suspend/resume functions in the new PM API. Signed-off-by: Amit Shah

virtio-pci: S3 support

2012-03-31T02:39:51Z

There's no difference in supporting S3 and S4 for virtio devices: the vqs have to be re-created as the device has to be assumed to be reset at restore-time. Since S4 already handles this situation, we can directly use the same code and callbacks for S3 support. Signed-off-by: Amit Shah

virtio-pci: drop restore_common()

2012-03-31T02:39:51Z

restore_common() was shared between restore and thaw callbacks. With thaw gone, we don't need restore_common() anymore. Signed-off-by: Amit Shah

virtio: drop thaw PM operation

2012-03-31T02:39:50Z

The thaw operation was used by the balloon driver, but after the last commit there's no reason to have separate thaw and restore callbacks. Signed-off-by: Amit Shah

virtio: balloon: Allow stats update after restore from S4

2012-03-31T02:39:50Z

There's no reason stats update after restore can't work. If a host requested for stats, and before servicing the request, the guest entered S4, upon restore, the stats request can still be processed and sent off to the host. Signed-off-by: Amit Shah

Remove all #inclusions of asm/system.h

2012-03-28T17:30:03Z

Remove all #inclusions of asm/system.h preparatory to splitting and killing it. Performed with the following command: perl -p -i -e 's!^#\s*include\s*.*\n!!' `grep -Irl '^#\s*include\s*' *` Signed-off-by: David Howells