linux/drivers/xen
David Hildenbrand 0266def913 xen/balloon: Fix mapping PG_offline pages to user space
The XEN balloon driver - in contrast to other balloon drivers - allows
to map some inflated pages to user space. Such pages are allocated via
alloc_xenballooned_pages() and freed via free_xenballooned_pages().
The pfn space of these allocated pages is used to map other things
by the hypervisor using hypercalls.

Pages marked with PG_offline must never be mapped to user space (as
this page type uses the mapcount field of struct pages).

So what we can do is, clear/set PG_offline when allocating/freeing an
inflated pages. This way, most inflated pages can be excluded by
dumping tools and the "reused for other purpose" balloon pages are
correctly not marked as PG_offline.

Fixes: 77c4adf6a6 (xen/balloon: mark inflated pages PG_offline)
Reported-by: Julien Grall <julien.grall@arm.com>
Tested-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
2019-03-15 15:35:35 +01:00
..
events xen: Fix x86 sched_clock() interface for xen 2019-01-16 13:06:05 -05:00
xen-pciback xen/pciback: Don't disable PCI_COMMAND on PCI device reset. 2019-02-18 06:49:46 +01:00
xenbus xen: drop writing error messages to xenstore 2018-10-26 09:17:16 +02:00
xenfs
acpi.c
arm-device.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
balloon.c xen/balloon: Fix mapping PG_offline pages to user space 2019-03-15 15:35:35 +01:00
biomerge.c block: remove ARCH_BIOVEC_PHYS_MERGEABLE 2018-09-26 08:45:11 -06:00
cpu_hotplug.c xen, cpu_hotplug: Prevent an out of bounds access 2019-03-08 17:58:14 +01:00
dbgp.c
efi.c
evtchn.c treewide: kvmalloc() -> kvmalloc_array() 2018-06-12 16:19:22 -07:00
features.c
gntalloc.c
gntdev-common.h xen/gntdev: Add initial support for dma-buf UAPI 2018-07-26 23:05:14 -04:00
gntdev-dmabuf.c xen/gntdev: Check and release imported dma-bufs on close 2019-02-18 06:50:10 +01:00
gntdev-dmabuf.h xen/gntdev: Do not destroy context while dma-bufs are in use 2019-02-18 06:50:03 +01:00
gntdev.c xen/gntdev: Do not destroy context while dma-bufs are in use 2019-02-18 06:50:03 +01:00
grant-table.c xen: fixes for 4.20-rc2 2018-11-10 08:58:48 -06:00
Kconfig xen: Introduce shared buffer helpers for page directory... 2018-12-18 12:15:55 -05:00
Makefile xen: remove pre-xen3 fallback handlers 2019-03-05 12:07:32 +01:00
manage.c xen/manage: don't complain about an empty value in control/sysrq node 2018-09-14 08:51:10 -04:00
mcelog.c xen/mcelog: eliminate redundant setting of interface version 2018-08-20 14:46:18 -04:00
mem-reservation.c xen/balloon: add runtime control for scrubbing ballooned out pages 2018-09-14 08:51:10 -04:00
pci.c
pcpu.c
platform-pci.c
preempt.c
privcmd-buf.c xen: remove size limit of privcmd-buf mapping interface 2018-11-09 16:38:34 +01:00
privcmd.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
privcmd.h xen: add new hypercall buffer mapping device 2018-06-22 08:26:42 +02:00
pvcalls-back.c xen/pvcalls: remove set but not used variable 'intf' 2019-01-04 10:55:27 -05:00
pvcalls-front.c pvcalls-front: fix potential null dereference 2019-01-15 16:13:47 -05:00
pvcalls-front.h xen: fix poll misannotation 2018-02-01 10:07:32 -05:00
swiotlb-xen.c treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
sys-hypervisor.c
time.c x86/paravirt: Use a single ops structure 2018-09-03 16:50:35 +02:00
tmem.c mm, swap, frontswap: fix THP swap if frontswap enabled 2018-02-21 15:35:43 -08:00
xen-acpi-cpuhotplug.c
xen-acpi-memhotplug.c
xen-acpi-pad.c xen: don't include <xen/xen.h> from <asm/io.h> and <asm/dma-mapping.h> 2018-09-26 08:45:18 -06:00
xen-acpi-processor.c xen/ACPI: Switch to bitmap_zalloc() 2019-03-04 15:04:39 +01:00
xen-balloon.c x86/xen: dont add memory above max allowed allocation 2019-02-18 06:52:51 +01:00
xen-front-pgdir-shbuf.c xen: Introduce shared buffer helpers for page directory... 2018-12-18 12:15:55 -05:00
xen-scsiback.c xen: fixes and features for 5.1-rc1 2019-03-11 17:08:14 -07:00
xen-selfballoon.c mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
xen-stub.c
xlate_mmu.c xen: xlate_mmu: add missing header to fix 'W=1' warning 2018-11-29 17:53:27 +01:00