Jennifer Herbert 3f9f1c6757 xen/grant-table: add a mechanism to safely unmap pages that are in use ... Introduce gnttab_unmap_refs_async() that can be used to safely unmap pages that may be in use (ref count > 1). If the pages are in use the unmap is deferred and retried later. This polling is not very clever but it should be good enough if the cases where the delay is necessary are rare. The initial delay is 5 ms and is increased linearly on each subsequent retry (to reduce load if the page is in use for a long time). This is needed to allow block backends using grant mapping to safely use network storage (block or filesystem based such as iSCSI or NFS). The network storage driver may complete a block request whilst there is a queued network packet retry (because the ack from the remote end races with deciding to queue the retry). The pages for the retried packet would be grant unmapped and the network driver (or hardware) would access the unmapped page. Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>		2015-01-28 14:03:14 +00:00
..
events
xen-pciback	xen-pciback: drop SR-IOV VFs when PF driver unloads	2014-12-04 12:42:03 +00:00
xenbus
xenfs
acpi.c
balloon.c	xen: remove scratch frames for ballooned pages and m2p override	2015-01-28 14:03:10 +00:00
biomerge.c
cpu_hotplug.c
dbgp.c
efi.c	efi: dmi: add support for SMBIOS 3.0 UEFI configuration table	2014-11-05 09:03:16 +01:00
evtchn.c
fallback.c
features.c
gntalloc.c
gntdev.c	xen/grant-table: add helpers for allocating pages	2015-01-28 14:03:12 +00:00
grant-table.c	xen/grant-table: add a mechanism to safely unmap pages that are in use	2015-01-28 14:03:14 +00:00
Kconfig
Makefile
manage.c
mcelog.c
pci.c	xen/pci: Allocate memory for physdev_pci_device_add's optarr	2014-10-23 16:24:02 +01:00
pcpu.c
platform-pci.c
privcmd.c
privcmd.h	xen: Add privcmd device driver	2011-12-16 13:29:31 -05:00
swiotlb-xen.c	Revert "swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single"	2014-12-10 14:58:35 +00:00
sys-hypervisor.c
tmem.c	xen/tmem: mark xen_tmem_init() __init	2015-01-23 11:55:24 +00:00
xen-acpi-cpuhotplug.c
xen-acpi-memhotplug.c
xen-acpi-pad.c
xen-acpi-processor.c	xen-acpi-processor: Don't display errors when we get -ENOSYS	2014-05-23 12:34:00 -04:00
xen-balloon.c	xen: Convert printks to pr_<level>	2013-06-28 11:19:58 -04:00
xen-scsiback.c	xen/grant-table: add helpers for allocating pages	2015-01-28 14:03:12 +00:00
xen-selfballoon.c
xen-stub.c