tmp_suning_uos_patched/drivers/xen
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/events: support threaded irqs for interdomain event channels 2014-09-23 13:36:19 +00:00
xen-pciback xen-pciback: drop SR-IOV VFs when PF driver unloads 2014-12-04 12:42:03 +00:00
xenbus xen: remove DEFINE_XENBUS_DRIVER() macro 2014-10-06 10:27:57 +01:00
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 xen/gntalloc: safely delete grefs in add_grefs() undo path 2014-09-04 13:14:05 +01:00
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 xen-scsiback: Add Xen PV SCSI backend driver 2014-09-23 13:36:19 +00:00
Makefile xen-scsiback: Add Xen PV SCSI backend driver 2014-09-23 13:36:19 +00:00
manage.c xen/manage: Always freeze/thaw processes when suspend/resuming 2014-09-02 15:36:59 +01:00
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 drivers: xen: Include appropriate header file in pcpu.c 2014-02-28 15:26:08 -05:00
platform-pci.c drivers: xen: Mark function as static in platform-pci.c 2014-02-28 15:26:04 -05:00
privcmd.c
privcmd.h
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 ACPI: Drop acpi_evaluate_hotplug_ost() and ACPI_HOTPLUG_OST 2014-02-22 00:50:49 +01:00
xen-acpi-memhotplug.c ACPI: Drop acpi_evaluate_hotplug_ost() and ACPI_HOTPLUG_OST 2014-02-22 00:50:49 +01:00
xen-acpi-pad.c ACPI / PAD / xen: use acpi_evaluate_ost() to replace open-coded version 2014-02-21 00:27:47 +01:00
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-scsiback.c xen/grant-table: add helpers for allocating pages 2015-01-28 14:03:12 +00:00
xen-selfballoon.c drivers:xen-selfballoon:reset 'frontswap_inertia_counter' after frontswap_shrink 2014-02-28 15:26:12 -05:00
xen-stub.c