Will Deacon 6cb6a94380 virtio: force vring descriptors to be allocated from lowmem ... commit b92b1b89a3 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 <will.deacon@arm.com> Cc: Sasha Levin <levinsasha928@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2013-01-11 09:06:47 -08:00
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config.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
Kconfig	virtio: add HAS_IOMEM dependency to MMIO platform bus driver	2011-11-24 13:04:47 +10:30
Makefile	virtio: Add platform bus driver for memory mapped virtio device	2011-11-02 11:41:01 +10:30
virtio_balloon.c	virtio: balloon: let host know of updated balloon size before module removal	2012-05-17 12:14:34 +03:00
virtio_mmio.c	virtio: harsher barriers for rpmsg.	2012-01-12 15:44:42 +10:30
virtio_pci.c	virtio-pci: switch to PM ops macro to initialise PM functions	2012-03-31 08:09:51 +05:30
virtio_ring.c	virtio: force vring descriptors to be allocated from lowmem	2013-01-11 09:06:47 -08:00
virtio.c	virtio: Add module.h to drivers/virtio users.	2011-10-31 19:32:14 -04:00