23 Oct, 2015
8 commits
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The type of the item in frame_list is xen_pfn_t which is not an unsigned
long on ARM but an uint64_t.With the current computation, the size of frame_list will be 2 *
PAGE_SIZE rather than PAGE_SIZE.I bet it's just mistake when the type has been switched from "unsigned
long" to "xen_pfn_t" in commit 965c0aaafe3e75d4e65cd4ec862915869bde3abd
"xen: balloon: use correct type for frame_list".Signed-off-by: Julien Grall
Signed-off-by: David Vrabel -
For ARM64 guests, Linux is able to support either 64K or 4K page
granularity. Although, the hypercall interface is always based on 4K
page granularity.With 64K page granularity, a single page will be spread over multiple
Xen frame.To avoid splitting the page into 4K frame, take advantage of the
extent_order field to directly allocate/free chunk of the Linux page
size.Note that PVMMU is only used for PV guest (which is x86) and the page
granularity is always 4KB. Some BUILD_BUG_ON has been added to ensure
that because the code has not been modified.Signed-off-by: Julien Grall
Reviewed-by: Stefano Stabellini
Signed-off-by: David Vrabel -
Pages returned by alloc_xenballooned_pages() will be used for grant
mapping which will call set_phys_to_machine() (in PV guests).Ballooned pages are set as INVALID_P2M_ENTRY in the p2m and thus may
be using the (shared) missing tables and a subsequent
set_phys_to_machine() will need to allocate new tables.Since the grant mapping may be done from a context that cannot sleep,
the p2m entries must already be allocated.Signed-off-by: David Vrabel
Reviewed-by: Daniel Kiper -
alloc_xenballooned_pages() is used to get ballooned pages to back
foreign mappings etc. Instead of having to balloon out real pages,
use (if supported) hotplugged memory.This makes more memory available to the guest and reduces
fragmentation in the p2m.This is only enabled if the xen.balloon.hotplug_unpopulated sysctl is
set to 1. This sysctl defaults to 0 in case the udev rules to
automatically online hotplugged memory do not exist.Signed-off-by: David Vrabel
Reviewed-by: Daniel Kiper
---
v3:
- Add xen.balloon.hotplug_unpopulated sysctl to enable use of hotplug
for unpopulated pages. -
All users of alloc_xenballoon_pages() wanted low memory pages, so
remove the option for high memory.Signed-off-by: David Vrabel
Reviewed-by: Daniel Kiper -
Now that we track the total number of pages (included hotplugged
regions), it is easy to determine if more memory needs to be
hotplugged.Add a new BP_WAIT state to signal that the balloon process needs to
wait until kicked by the memory add notifier (when the new section is
onlined by userspace).Signed-off-by: David Vrabel
Reviewed-by: Daniel Kiper
---
v3:
- Return BP_WAIT if enough sections are already hotplugged.v2:
- New BP_WAIT status after adding new memory sections. -
The stats used for memory hotplug make no sense and are fiddled with
in odd ways. Remove them and introduce total_pages to track the total
number of pages (both populated and unpopulated) including those within
hotplugged regions (note that this includes not yet onlined pages).This will be used in a subsequent commit (xen/balloon: only hotplug
additional memory if required) when deciding whether additional memory
needs to be hotplugged.Signed-off-by: David Vrabel
Reviewed-by: Daniel Kiper -
Instead of placing hotplugged memory at the end of RAM (which may
conflict with PCI devices or reserved regions) use allocate_resource()
to get a new, suitably aligned resource that does not conflict.Signed-off-by: David Vrabel
Reviewed-by: Daniel Kiper
---
v3:
- Remove stale comment.
09 Sep, 2015
1 commit
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Based on include/xen/mm.h [1], Linux is mistakenly using MFN when GFN
is meant, I suspect this is because the first support for Xen was for
PV. This resulted in some misimplementation of helpers on ARM and
confused developers about the expected behavior.For instance, with pfn_to_mfn, we expect to get an MFN based on the name.
Although, if we look at the implementation on x86, it's returning a GFN.For clarity and avoid new confusion, replace any reference to mfn with
gfn in any helpers used by PV drivers. The x86 code will still keep some
reference of pfn_to_mfn which may be used by all kind of guests
No changes as been made in the hypercall field, even
though they may be invalid, in order to keep the same as the defintion
in xen repo.Note that page_to_mfn has been renamed to xen_page_to_gfn to avoid a
name to close to the KVM function gfn_to_page.Take also the opportunity to simplify simple construction such
as pfn_to_mfn(page_to_pfn(page)) into xen_page_to_gfn. More complex clean up
will come in follow-up patches.[1] http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=e758ed14f390342513405dd766e874934573e6cb
Signed-off-by: Julien Grall
Reviewed-by: Stefano Stabellini
Acked-by: Dmitry Torokhov
Acked-by: Wei Liu
Signed-off-by: David Vrabel
08 Sep, 2015
1 commit
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Instead of using physical addresses for accounting of extra memory
areas available for ballooning switch to pfns as this is much less
error prone regarding partial pages.Reported-by: Roger Pau Monné
Tested-by: Roger Pau Monné
Signed-off-by: Juergen Gross
Signed-off-by: David Vrabel
20 Jul, 2015
1 commit
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When dom0 is being ballooned balloon_process() will hold the balloon
mutex until it is finished. This will block e.g. creation of new
domains as the device backends for the new domain need some
autoballooned pages for the ring buffers.Avoid this by releasing the balloon mutex from time to time during
ballooning. Adjust the comment above balloon_process() regarding
multiple instances of balloon_process().Instead of open coding it, just use cond_resched().
Signed-off-by: Juergen Gross
Signed-off-by: David Vrabel
23 Mar, 2015
1 commit
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Commit 25b884a83d487fd62c3de7ac1ab5549979188482 ("x86/xen: set
regions above the end of RAM as 1:1") introduced a regression.To be able to add memory pages which were added via memory hotplug to
a pv domain, the pages must be "invalid" instead of "identity" in the
p2m list before they can be added.Suggested-by: David Vrabel
Signed-off-by: Juergen Gross
Cc: # 3.16+
Reviewed-by: Daniel Kiper
Signed-off-by: David Vrabel
28 Jan, 2015
1 commit
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The scratch frame mappings for ballooned pages and the m2p override
are broken. Remove them in preparation for replacing them with
simpler mechanisms that works.The scratch pages did not ensure that the page was not in use. In
particular, the foreign page could still be in use by hardware. If
the guest reused the frame the hardware could read or write that
frame.The m2p override did not handle the same frame being granted by two
different grant references. Trying an M2P override lookup in this
case is impossible.With the m2p override removed, the grant map/unmap for the kernel
mappings (for x86 PV) can be easily batched in
set_foreign_p2m_mapping() and clear_foreign_p2m_mapping().Signed-off-by: David Vrabel
Reviewed-by: Stefano Stabellini
23 Oct, 2014
1 commit
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Commit 3dcf63677d4e ("xen/balloon: cancel ballooning if adding new
memory failed") makes reserve_additional_memory() return BP_ECANCELED
when an error is encountered. This error, however, is ignored by the
caller (balloon_process()) since it is overwritten by subsequent call
to update_schedule(). This results in continuous attempts to add more
memory, all of which are likely to fail again.We should stop trying to schedule next iteration of ballooning when
the current one has failed.Signed-off-by: Boris Ostrovsky
Reviewed-by: Daniel Kiper
Signed-off-by: David Vrabel
02 Sep, 2014
1 commit
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If the balloon driver is adding additional memory regions to the
balloon and add_memory() fails it will likely continuously fail so
cancel the balloon operation.Signed-off-by: David Vrabel
Reviewed-by: Daniel Kiper
04 Jul, 2014
1 commit
-
Since cd9151e26d31048b2b5e00fd02e110e07d2200c9 (xen/balloon: set a
mapping for ballooned out pages), a ballooned out page had its entry
in the p2m set to the MFN of one of the scratch pages. This means
that the p2m will contain many entries pointing to the same MFN.During a domain save, these many-to-one entries are not identified as
such and the scratch page is saved multiple times. On restore the
ballooned pages are populated with new frames and the domain may use
up its allocation before all pages can be restored.Since the original fix only needed to keep a mapping for the ballooned
page it is safe to set ballooned out pages as INVALID_P2M_ENTRY in the
p2m (as they were before). Thus preventing them from being saved and
re-populated on restore.Signed-off-by: David Vrabel
Reported-by: Marek Marczykowski
Tested-by: Marek Marczykowski
Acked-by: Stefano Stabellini
Cc:
08 Apr, 2014
1 commit
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Pull CPU hotplug notifiers registration fixes from Rafael Wysocki:
"The purpose of this single series of commits from Srivatsa S Bhat
(with a small piece from Gautham R Shenoy) touching multiple
subsystems that use CPU hotplug notifiers is to provide a way to
register them that will not lead to deadlocks with CPU online/offline
operations as described in the changelog of commit 93ae4f978ca7f ("CPU
hotplug: Provide lockless versions of callback registration
functions").The first three commits in the series introduce the API and document
it and the rest simply goes through the users of CPU hotplug notifiers
and converts them to using the new method"* tag 'cpu-hotplug-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (52 commits)
net/iucv/iucv.c: Fix CPU hotplug callback registration
net/core/flow.c: Fix CPU hotplug callback registration
mm, zswap: Fix CPU hotplug callback registration
mm, vmstat: Fix CPU hotplug callback registration
profile: Fix CPU hotplug callback registration
trace, ring-buffer: Fix CPU hotplug callback registration
xen, balloon: Fix CPU hotplug callback registration
hwmon, via-cputemp: Fix CPU hotplug callback registration
hwmon, coretemp: Fix CPU hotplug callback registration
thermal, x86-pkg-temp: Fix CPU hotplug callback registration
octeon, watchdog: Fix CPU hotplug callback registration
oprofile, nmi-timer: Fix CPU hotplug callback registration
intel-idle: Fix CPU hotplug callback registration
clocksource, dummy-timer: Fix CPU hotplug callback registration
drivers/base/topology.c: Fix CPU hotplug callback registration
acpi-cpufreq: Fix CPU hotplug callback registration
zsmalloc: Fix CPU hotplug callback registration
scsi, fcoe: Fix CPU hotplug callback registration
scsi, bnx2fc: Fix CPU hotplug callback registration
scsi, bnx2i: Fix CPU hotplug callback registration
...
25 Mar, 2014
1 commit
-
Xen balloon driver will update ballooned out pages' P2M entries to point
to scratch page for PV guests. In 24f69373e2 ("xen/balloon: don't alloc
page while non-preemptible", kmap_flush_unused was moved after updating
P2M table. In that case for 32 bit PV guest we might end up withP2M X -----> S (S is mfn of balloon scratch page)
M2P Y -----> X (Y is mfn in persistent kmap entry)kmap_flush_unused() iterates through all the PTEs in the kmap address
space, using pte_to_page() to obtain the page. If the p2m and the m2p
are inconsistent the incorrect page is returned. This will clear
page->address on the wrong page which may cause subsequent oopses if
that page is currently kmap'ed.Move the flush back between get_page and __set_phys_to_machine to fix
this.Signed-off-by: Wei Liu
Signed-off-by: David Vrabel
Cc: stable@vger.kernel.org # 3.12+
20 Mar, 2014
1 commit
-
Subsystems that want to register CPU hotplug callbacks, as well as perform
initialization for the CPUs that are already online, often do it as shown
below:get_online_cpus();
for_each_online_cpu(cpu)
init_cpu(cpu);register_cpu_notifier(&foobar_cpu_notifier);
put_online_cpus();
This is wrong, since it is prone to ABBA deadlocks involving the
cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
with CPU hotplug operations).The xen balloon driver doesn't take get/put_online_cpus() around this code,
but that is also buggy, since it can miss CPU hotplug events in between the
initialization and callback registration:for_each_online_cpu(cpu)
init_cpu(cpu);
^
| Race window; Can miss CPU hotplug events here.
v
register_cpu_notifier(&foobar_cpu_notifier);Interestingly, the balloon code in xen can simply be reorganized as shown
below, to have a race-free method to register hotplug callbacks, without even
taking get/put_online_cpus(). This is because the initialization performed for
already online CPUs is exactly the same as that performed for CPUs that come
online later. Moreover, the code has checks in place to avoid double
initialization.register_cpu_notifier(&foobar_cpu_notifier);
get_online_cpus();
for_each_online_cpu(cpu)
init_cpu(cpu);put_online_cpus();
A hotplug operation that occurs between registering the notifier and calling
get_online_cpus(), won't disrupt anything, because the code takes care to
perform the memory allocations only once.So reorganize the balloon code in xen this way to fix the issues with CPU
hotplug callback registration.Cc: Konrad Rzeszutek Wilk
Cc: David Vrabel
Cc: Ingo Molnar
Reviewed-by: Boris Ostrovsky
Signed-off-by: Srivatsa S. Bhat
Signed-off-by: Rafael J. Wysocki
06 Jan, 2014
1 commit
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Replace the code logic at balloon_first_page() by calling
list_first_entry_or_null() directly. since here is only
one user of that routine, therefore we can just remove it.Signed-off-by: Jie Liu
Signed-off-by: Konrad Rzeszutek Wilk
Reviewed-by: David Vrabel
14 Dec, 2013
1 commit
-
The auto-xlat logic vs the non-xlat means that we don't need to for
auto-xlat guests (like PVH, HVM or ARM):
- use P2M
- use scratch page.However the code in increase_reservation does modify the p2m for
auto_translate guests, but not in decrease_reservation.Fix that by avoiding any p2m modifications in both increase_reservation
and decrease_reservation for auto_translated guests.And also avoid allocating or using scratch pages for auto_translated guests.
Lastly, since !auto-xlat is really another way of saying 'xen_pv'
remove the redundant 'xen_pv_domain' check.Signed-off-by: Stefano Stabellini
[v2: Updated the description]
Signed-off-by: Konrad Rzeszutek Wilk
09 Nov, 2013
2 commits
-
commit 6efa20e49b9cb1db1ab66870cc37323474a75a13
("xen: Support 64-bit PV guest receiving NMIs") and
commit cd9151e26d31048b2b5e00fd02e110e07d2200c9
( "xen/balloon: set a mapping for ballooned out pages")
added new instances of __cpuinit usage.We removed this a couple versions ago; we now want to remove
the compat no-op stubs. Introducing new users is not what
we want to see at this point in time, as it will break once
the stubs are gone.Cc: Konrad Rzeszutek Wilk
Cc: Stefano Stabellini
Signed-off-by: Paul Gortmaker
Signed-off-by: Konrad Rzeszutek Wilk -
Currently balloon's initial value is set to max_pfn which includes
non-RAM ranges such as MMIO hole. As result, initial memory target
(specified by guest's configuration file) will appear smaller than
what balloon driver perceives to be the current number of available
pages. Thus it will balloon down "extra" pages, decreasing amount of
available memory for no good reason.Signed-off-by: Boris Ostrovsky
Signed-off-by: Konrad Rzeszutek Wilk
25 Sep, 2013
1 commit
-
get_balloon_scratch_page() disables preemption so we cannot call
alloc_page() in between get/put_balloon_scratch_page(). Shuffle bits
around in decrease_reservation() to avoid this.Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk
12 Sep, 2013
2 commits
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The BUG_ON in increase_reservation is wrong as we have P2M entry
ballooned out page set to balloon scratch page, so it might have a valid
P2M entry at that point.Signed-off-by: Wei Liu
Signed-off-by: Stefano Stabellini -
In decrease_reservation(), if the kernel is preempted between updating
the mapping and updating the p2m then they may end up using different
scratch pages.Use get_balloon_scratch_page() and put_balloon_scratch_page() which use
get_cpu_var() and put_cpu_var() to correctly disable preemption.Signed-off-by: David Vrabel
Signed-off-by: Stefano Stabellini
Tested-by: Sander Eikelenboom
31 Aug, 2013
1 commit
-
In commit cd9151e2: xen/balloon: set a mapping for ballooned out pages
we have the ballooned out page's mapping set to a scratch page.That commit also sets the P2M entry of ballooned out page to the scratch
page's MFN. This is necessary for PV guest but not for HVM guest. On the
other hand, setting the P2M entry would trigger BUG_ON in
__set_phys_to_machine.The correct thing to do here is to avoid calling __set_phys_to_machine
for auto translated guest.Signed-off-by: Wei Liu
Cc: Stefano Stabellini
Signed-off-by: Konrad Rzeszutek Wilk
Acked-by: Stefano Stabellini
09 Aug, 2013
1 commit
-
Currently ballooned out pages are mapped to 0 and have INVALID_P2M_ENTRY
in the p2m. These ballooned out pages are used to map foreign grants
by gntdev and blkback (see alloc_xenballooned_pages).Allocate a page per cpu and map all the ballooned out pages to the
corresponding mfn. Set the p2m accordingly. This way reading from a
ballooned out page won't cause a kernel crash (see
http://lists.xen.org/archives/html/xen-devel/2012-12/msg01154.html).Signed-off-by: Stefano Stabellini
Reviewed-by: David Vrabel
CC: alex@alex.org.uk
CC: dcrisan@flexiant.com
Signed-off-by: Konrad Rzeszutek Wilk
04 Jul, 2013
2 commits
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Merge first patch-bomb from Andrew Morton:
- various misc bits
- I'm been patchmonkeying ocfs2 for a while, as Joel and Mark have been
distracted. There has been quite a bit of activity.
- About half the MM queue
- Some backlight bits
- Various lib/ updates
- checkpatch updates
- zillions more little rtc patches
- ptrace
- signals
- exec
- procfs
- rapidio
- nbd
- aoe
- pps
- memstick
- tools/testing/selftests updates* emailed patches from Andrew Morton : (445 commits)
tools/testing/selftests: don't assume the x bit is set on scripts
selftests: add .gitignore for kcmp
selftests: fix clean target in kcmp Makefile
selftests: add .gitignore for vm
selftests: add hugetlbfstest
self-test: fix make clean
selftests: exit 1 on failure
kernel/resource.c: remove the unneeded assignment in function __find_resource
aio: fix wrong comment in aio_complete()
drivers/w1/slaves/w1_ds2408.c: add magic sequence to disable P0 test mode
drivers/memstick/host/r592.c: convert to module_pci_driver
drivers/memstick/host/jmb38x_ms: convert to module_pci_driver
pps-gpio: add device-tree binding and support
drivers/pps/clients/pps-gpio.c: convert to module_platform_driver
drivers/pps/clients/pps-gpio.c: convert to devm_* helpers
drivers/parport/share.c: use kzalloc
Documentation/accounting/getdelays.c: avoid strncpy in accounting tool
aoe: update internal version number to v83
aoe: update copyright date
aoe: perform I/O completions in parallel
... -
Enhance adjust_managed_page_count() to adjust totalhigh_pages for
highmem pages. And change code which directly adjusts totalram_pages to
use adjust_managed_page_count() because it adjusts totalram_pages,
totalhigh_pages and zone->managed_pages altogether in a safe way.Remove inc_totalhigh_pages() and dec_totalhigh_pages() from xen/balloon
driver bacause adjust_managed_page_count() has already adjusted
totalhigh_pages.This patch also fixes two bugs:
1) enhances virtio_balloon driver to adjust totalhigh_pages when
reserve/unreserve pages.
2) enhance memory_hotplug.c to adjust totalhigh_pages when hot-removing
memory.We still need to deal with modifications of totalram_pages in file
arch/powerpc/platforms/pseries/cmm.c, but need help from PPC experts.[akpm@linux-foundation.org: remove ifdef, per Wanpeng Li, virtio_balloon.c cleanup, per Sergei]
[akpm@linux-foundation.org: export adjust_managed_page_count() to modules, for drivers/virtio/virtio_balloon.c]
Signed-off-by: Jiang Liu
Cc: Chris Metcalf
Cc: Rusty Russell
Cc: "Michael S. Tsirkin"
Cc: Konrad Rzeszutek Wilk
Cc: Jeremy Fitzhardinge
Cc: Wen Congyang
Cc: Tang Chen
Cc: Yasuaki Ishimatsu
Cc: Mel Gorman
Cc: Minchan Kim
Cc: "H. Peter Anvin"
Cc:
Cc: Arnd Bergmann
Cc: Catalin Marinas
Cc: David Howells
Cc: Geert Uytterhoeven
Cc: Ingo Molnar
Cc: Jianguo Wu
Cc: Joonsoo Kim
Cc: Kamezawa Hiroyuki
Cc: Marek Szyprowski
Cc: Michel Lespinasse
Cc: Rik van Riel
Cc: Tejun Heo
Cc: Thomas Gleixner
Cc: Will Deacon
Cc: Yinghai Lu
Cc: Russell King
Cc: Sergei Shtylyov
Cc: Wu Fengguang
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
28 Jun, 2013
1 commit
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Convert printks to pr_ (excludes printk(KERN_DEBUG...)
to be more consistent throughout the xen subsystem.Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME
Coalesce formats and add missing word spaces
Add missing newlines
Align arguments and reflow to 80 columns
Remove DRV_NAME from formats as pr_fmt adds the same contentThis does change some of the prefixes of these messages
but it also does make them more consistent.Signed-off-by: Joe Perches
Signed-off-by: Konrad Rzeszutek Wilk
21 May, 2013
1 commit
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Fixed assignment error in if statement in balloon.c
Signed-off-by: Lisa Nguyen
Signed-off-by: Konrad Rzeszutek Wilk
29 Nov, 2012
1 commit
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The ARM platform has no concept of PVMMU and therefor no
HYPERVISOR_update_va_mapping et al. Allow this code to be compiled out
when not required.In some similar situations (e.g. P2M) we have defined dummy functions
to avoid this, however I think we can/should draw the line at dummying
out actual hypercalls.Signed-off-by: Ian Campbell
Signed-off-by: Konrad Rzeszutek Wilk
20 Oct, 2012
2 commits
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This is now a xen_pfn_t.
Signed-off-by: Ian Campbell
Signed-off-by: Konrad Rzeszutek Wilk -
This breaks on !X86 and AFAICT is not required on X86 either.
Acked-by: Stefano Stabellini
Signed-off-by: Ian Campbell
Signed-off-by: Konrad Rzeszutek Wilk
17 Nov, 2011
1 commit
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If highmem pages are requested from the balloon on a system without
highmem, the implementation of alloc_xenballooned_pages will allocate
all available memory trying to find highmem pages to return. Allow
low memory to be returned when highmem pages are requested to avoid
this loop.Signed-off-by: Daniel De Graaf
Signed-off-by: Konrad Rzeszutek Wilk
07 Nov, 2011
1 commit
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* 'stable/cleanups-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen: use static initializers in xen-balloon.c
Xen: fix braces and tabs coding style issue in xenbus_probe.c
Xen: fix braces coding style issue in xenbus_probe.h
Xen: fix whitespaces,tabs coding style issue in drivers/xen/pci.c
Xen: fix braces coding style issue in gntdev.c and grant-table.c
Xen: fix whitespaces,tabs coding style issue in drivers/xen/events.c
Xen: fix whitespaces,tabs coding style issue in drivers/xen/balloon.cFix up trivial whitespace-conflicts in
drivers/xen/{balloon.c,pci.c,xenbus/xenbus_probe.c}
01 Nov, 2011
1 commit
-
Previously these drivers just got module.h implicitly, but we
are cleaning that up and it will be no longer. Call out the
real users of it.Signed-off-by: Paul Gortmaker
25 Oct, 2011
1 commit
-
….org/pub/scm/linux/kernel/git/konrad/xen
* 'stable/bug.fixes-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/p2m/debugfs: Make type_name more obvious.
xen/p2m/debugfs: Fix potential pointer exception.
xen/enlighten: Fix compile warnings and set cx to known value.
xen/xenbus: Remove the unnecessary check.
xen/irq: If we fail during msi_capability_init return proper error code.
xen/events: Don't check the info for NULL as it is already done.
xen/events: BUG() when we can't allocate our event->irq array.* 'stable/mmu.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen: Fix selfballooning and ensure it doesn't go too far
xen/gntdev: Fix sleep-inside-spinlock
xen: modify kernel mappings corresponding to granted pages
xen: add an "highmem" parameter to alloc_xenballooned_pages
xen/p2m: Use SetPagePrivate and its friends for M2P overrides.
xen/p2m: Make debug/xen/mmu/p2m visible again.
Revert "xen/debug: WARN_ON when identity PFN has no _PAGE_IOMAP flag set."
29 Sep, 2011
1 commit
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Allow the xen balloon driver to populate its list of extra pages from
more than one region of memory. This will allow platforms to provide
(for example) a region of low memory and a region of high memory.The maximum possible number of extra regions is 128 (== E820MAX) which
is quite large so xen_extra_mem is placed in __initdata. This is safe
as both xen_memory_setup() and balloon_init() are in __init.The balloon regions themselves are not altered (i.e., there is still
only the one region).Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk