2008-04-03 01:54:13 +08:00
|
|
|
/******************************************************************************
|
|
|
|
* Xen balloon driver - enables returning/claiming memory to/from Xen.
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*
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* Copyright (c) 2003, B Dragovic
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* Copyright (c) 2003-2004, M Williamson, K Fraser
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* Copyright (c) 2005 Dan M. Smith, IBM Corporation
|
2011-07-26 08:12:06 +08:00
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* Copyright (c) 2010 Daniel Kiper
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*
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* Memory hotplug support was written by Daniel Kiper. Work on
|
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* it was sponsored by Google under Google Summer of Code 2010
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* program. Jeremy Fitzhardinge from Citrix was the mentor for
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* this project.
|
2008-04-03 01:54:13 +08:00
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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2013-06-28 18:21:41 +08:00
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#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
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2013-08-04 22:39:40 +08:00
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#include <linux/cpu.h>
|
2008-04-03 01:54:13 +08:00
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#include <linux/kernel.h>
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#include <linux/sched.h>
|
2017-02-03 00:54:15 +08:00
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|
#include <linux/cred.h>
|
2008-04-03 01:54:13 +08:00
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#include <linux/errno.h>
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#include <linux/mm.h>
|
2018-10-31 06:09:49 +08:00
|
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|
#include <linux/memblock.h>
|
2008-04-03 01:54:13 +08:00
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
|
|
|
#include <linux/gfp.h>
|
2011-07-26 08:12:06 +08:00
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|
|
#include <linux/notifier.h>
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|
|
#include <linux/memory.h>
|
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|
#include <linux/memory_hotplug.h>
|
2013-08-04 22:39:40 +08:00
|
|
|
#include <linux/percpu-defs.h>
|
2015-06-24 22:58:42 +08:00
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|
|
#include <linux/slab.h>
|
2015-06-25 23:29:18 +08:00
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|
|
#include <linux/sysctl.h>
|
2008-04-03 01:54:13 +08:00
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
|
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|
|
#include <asm/tlb.h>
|
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|
2008-12-17 04:37:07 +08:00
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|
|
#include <asm/xen/hypervisor.h>
|
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|
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#include <asm/xen/hypercall.h>
|
2009-10-07 06:11:14 +08:00
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|
|
#include <xen/xen.h>
|
2008-12-17 04:37:07 +08:00
|
|
|
#include <xen/interface/xen.h>
|
2008-04-03 01:54:13 +08:00
|
|
|
#include <xen/interface/memory.h>
|
2011-03-14 23:29:37 +08:00
|
|
|
#include <xen/balloon.h>
|
2008-04-03 01:54:13 +08:00
|
|
|
#include <xen/features.h>
|
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|
|
#include <xen/page.h>
|
2018-07-20 17:01:44 +08:00
|
|
|
#include <xen/mem-reservation.h>
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2015-06-25 23:29:18 +08:00
|
|
|
static int xen_hotplug_unpopulated;
|
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|
|
#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
|
|
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|
|
static struct ctl_table balloon_table[] = {
|
|
|
|
{
|
|
|
|
.procname = "hotplug_unpopulated",
|
|
|
|
.data = &xen_hotplug_unpopulated,
|
|
|
|
.maxlen = sizeof(int),
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|
|
|
.mode = 0644,
|
|
|
|
.proc_handler = proc_dointvec_minmax,
|
proc/sysctl: add shared variables for range check
In the sysctl code the proc_dointvec_minmax() function is often used to
validate the user supplied value between an allowed range. This
function uses the extra1 and extra2 members from struct ctl_table as
minimum and maximum allowed value.
On sysctl handler declaration, in every source file there are some
readonly variables containing just an integer which address is assigned
to the extra1 and extra2 members, so the sysctl range is enforced.
The special values 0, 1 and INT_MAX are very often used as range
boundary, leading duplication of variables like zero=0, one=1,
int_max=INT_MAX in different source files:
$ git grep -E '\.extra[12].*&(zero|one|int_max)' |wc -l
248
Add a const int array containing the most commonly used values, some
macros to refer more easily to the correct array member, and use them
instead of creating a local one for every object file.
This is the bloat-o-meter output comparing the old and new binary
compiled with the default Fedora config:
# scripts/bloat-o-meter -d vmlinux.o.old vmlinux.o
add/remove: 2/2 grow/shrink: 0/2 up/down: 24/-188 (-164)
Data old new delta
sysctl_vals - 12 +12
__kstrtab_sysctl_vals - 12 +12
max 14 10 -4
int_max 16 - -16
one 68 - -68
zero 128 28 -100
Total: Before=20583249, After=20583085, chg -0.00%
[mcroce@redhat.com: tipc: remove two unused variables]
Link: http://lkml.kernel.org/r/20190530091952.4108-1-mcroce@redhat.com
[akpm@linux-foundation.org: fix net/ipv6/sysctl_net_ipv6.c]
[arnd@arndb.de: proc/sysctl: make firmware loader table conditional]
Link: http://lkml.kernel.org/r/20190617130014.1713870-1-arnd@arndb.de
[akpm@linux-foundation.org: fix fs/eventpoll.c]
Link: http://lkml.kernel.org/r/20190430180111.10688-1-mcroce@redhat.com
Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-07-19 06:58:50 +08:00
|
|
|
.extra1 = SYSCTL_ZERO,
|
|
|
|
.extra2 = SYSCTL_ONE,
|
2015-06-25 23:29:18 +08:00
|
|
|
},
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct ctl_table balloon_root[] = {
|
|
|
|
{
|
|
|
|
.procname = "balloon",
|
|
|
|
.mode = 0555,
|
|
|
|
.child = balloon_table,
|
|
|
|
},
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct ctl_table xen_root[] = {
|
|
|
|
{
|
|
|
|
.procname = "xen",
|
|
|
|
.mode = 0555,
|
|
|
|
.child = balloon_root,
|
|
|
|
},
|
|
|
|
{ }
|
|
|
|
};
|
|
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|
#endif
|
|
|
|
|
2015-05-04 22:39:08 +08:00
|
|
|
/*
|
|
|
|
* Use one extent per PAGE_SIZE to avoid to break down the page into
|
|
|
|
* multiple frame.
|
|
|
|
*/
|
|
|
|
#define EXTENT_ORDER (fls(XEN_PFN_PER_PAGE) - 1)
|
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
/*
|
|
|
|
* balloon_process() state:
|
|
|
|
*
|
|
|
|
* BP_DONE: done or nothing to do,
|
2015-06-25 19:10:28 +08:00
|
|
|
* BP_WAIT: wait to be rescheduled,
|
2011-03-09 05:48:24 +08:00
|
|
|
* BP_EAGAIN: error, go to sleep,
|
|
|
|
* BP_ECANCELED: error, balloon operation canceled.
|
|
|
|
*/
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
enum bp_state {
|
|
|
|
BP_DONE,
|
2015-06-25 19:10:28 +08:00
|
|
|
BP_WAIT,
|
2011-03-09 05:48:24 +08:00
|
|
|
BP_EAGAIN,
|
|
|
|
BP_ECANCELED
|
2008-04-03 01:54:13 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static DEFINE_MUTEX(balloon_mutex);
|
|
|
|
|
2011-03-14 23:29:37 +08:00
|
|
|
struct balloon_stats balloon_stats;
|
|
|
|
EXPORT_SYMBOL_GPL(balloon_stats);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
|
|
|
/* We increase/decrease in batches which fit in a page */
|
2015-10-07 21:04:33 +08:00
|
|
|
static xen_pfn_t frame_list[PAGE_SIZE / sizeof(xen_pfn_t)];
|
2013-08-04 22:39:40 +08:00
|
|
|
|
2008-04-03 01:54:13 +08:00
|
|
|
|
|
|
|
/* List of ballooned pages, threaded through the mem_map array. */
|
|
|
|
static LIST_HEAD(ballooned_pages);
|
2015-06-25 23:29:18 +08:00
|
|
|
static DECLARE_WAIT_QUEUE_HEAD(balloon_wq);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
|
|
|
/* Main work function, always executed in process context. */
|
|
|
|
static void balloon_process(struct work_struct *work);
|
2011-03-09 05:47:39 +08:00
|
|
|
static DECLARE_DELAYED_WORK(balloon_worker, balloon_process);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
|
|
|
/* When ballooning out (allocating memory to return to Xen) we don't really
|
|
|
|
want the kernel to try too hard since that can trigger the oom killer. */
|
|
|
|
#define GFP_BALLOON \
|
|
|
|
(GFP_HIGHUSER | __GFP_NOWARN | __GFP_NORETRY | __GFP_NOMEMALLOC)
|
|
|
|
|
|
|
|
/* balloon_append: add the given page to the balloon. */
|
2019-10-01 17:01:50 +08:00
|
|
|
static void balloon_append(struct page *page)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2019-10-01 17:01:51 +08:00
|
|
|
__SetPageOffline(page);
|
|
|
|
|
2008-04-03 01:54:13 +08:00
|
|
|
/* Lowmem is re-populated first, so highmem pages go at list tail. */
|
|
|
|
if (PageHighMem(page)) {
|
|
|
|
list_add_tail(&page->lru, &ballooned_pages);
|
|
|
|
balloon_stats.balloon_high++;
|
|
|
|
} else {
|
|
|
|
list_add(&page->lru, &ballooned_pages);
|
|
|
|
balloon_stats.balloon_low++;
|
|
|
|
}
|
2015-06-25 23:29:18 +08:00
|
|
|
wake_up(&balloon_wq);
|
2010-09-01 06:01:16 +08:00
|
|
|
}
|
2009-07-31 05:54:36 +08:00
|
|
|
|
2008-04-03 01:54:13 +08:00
|
|
|
/* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
|
2015-06-25 20:12:46 +08:00
|
|
|
static struct page *balloon_retrieve(bool require_lowmem)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
if (list_empty(&ballooned_pages))
|
|
|
|
return NULL;
|
|
|
|
|
2015-06-25 20:12:46 +08:00
|
|
|
page = list_entry(ballooned_pages.next, struct page, lru);
|
|
|
|
if (require_lowmem && PageHighMem(page))
|
|
|
|
return NULL;
|
2008-04-03 01:54:13 +08:00
|
|
|
list_del(&page->lru);
|
|
|
|
|
2013-07-04 06:03:21 +08:00
|
|
|
if (PageHighMem(page))
|
2008-04-03 01:54:13 +08:00
|
|
|
balloon_stats.balloon_high--;
|
2013-07-04 06:03:21 +08:00
|
|
|
else
|
2008-04-03 01:54:13 +08:00
|
|
|
balloon_stats.balloon_low--;
|
|
|
|
|
2019-10-01 17:01:52 +08:00
|
|
|
__ClearPageOffline(page);
|
2008-04-03 01:54:13 +08:00
|
|
|
return page;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct page *balloon_next_page(struct page *page)
|
|
|
|
{
|
|
|
|
struct list_head *next = page->lru.next;
|
|
|
|
if (next == &ballooned_pages)
|
|
|
|
return NULL;
|
|
|
|
return list_entry(next, struct page, lru);
|
|
|
|
}
|
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
static enum bp_state update_schedule(enum bp_state state)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2015-06-25 19:10:28 +08:00
|
|
|
if (state == BP_WAIT)
|
|
|
|
return BP_WAIT;
|
|
|
|
|
2014-10-08 05:00:07 +08:00
|
|
|
if (state == BP_ECANCELED)
|
|
|
|
return BP_ECANCELED;
|
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
if (state == BP_DONE) {
|
|
|
|
balloon_stats.schedule_delay = 1;
|
|
|
|
balloon_stats.retry_count = 1;
|
|
|
|
return BP_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
++balloon_stats.retry_count;
|
|
|
|
|
|
|
|
if (balloon_stats.max_retry_count != RETRY_UNLIMITED &&
|
|
|
|
balloon_stats.retry_count > balloon_stats.max_retry_count) {
|
|
|
|
balloon_stats.schedule_delay = 1;
|
|
|
|
balloon_stats.retry_count = 1;
|
|
|
|
return BP_ECANCELED;
|
|
|
|
}
|
|
|
|
|
|
|
|
balloon_stats.schedule_delay <<= 1;
|
|
|
|
|
|
|
|
if (balloon_stats.schedule_delay > balloon_stats.max_schedule_delay)
|
|
|
|
balloon_stats.schedule_delay = balloon_stats.max_schedule_delay;
|
|
|
|
|
|
|
|
return BP_EAGAIN;
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
|
|
|
|
2011-07-26 08:12:06 +08:00
|
|
|
#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
|
2016-05-10 17:27:54 +08:00
|
|
|
static void release_memory_resource(struct resource *resource)
|
|
|
|
{
|
|
|
|
if (!resource)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* No need to reset region to identity mapped since we now
|
|
|
|
* know that no I/O can be in this region
|
|
|
|
*/
|
|
|
|
release_resource(resource);
|
|
|
|
kfree(resource);
|
|
|
|
}
|
|
|
|
|
2015-06-24 22:58:42 +08:00
|
|
|
static struct resource *additional_memory_resource(phys_addr_t size)
|
|
|
|
{
|
2018-11-28 04:58:21 +08:00
|
|
|
struct resource *res;
|
|
|
|
int ret;
|
2015-06-24 22:58:42 +08:00
|
|
|
|
|
|
|
res = kzalloc(sizeof(*res), GFP_KERNEL);
|
|
|
|
if (!res)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
res->name = "System RAM";
|
2016-01-27 04:57:24 +08:00
|
|
|
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
|
2015-06-24 22:58:42 +08:00
|
|
|
|
2018-11-28 04:58:21 +08:00
|
|
|
ret = allocate_resource(&iomem_resource, res,
|
|
|
|
size, 0, -1,
|
|
|
|
PAGES_PER_SECTION * PAGE_SIZE, NULL, NULL);
|
|
|
|
if (ret < 0) {
|
|
|
|
pr_err("Cannot allocate new System RAM resource\n");
|
|
|
|
kfree(res);
|
|
|
|
return NULL;
|
2015-06-24 22:58:42 +08:00
|
|
|
}
|
|
|
|
|
2016-03-18 00:52:00 +08:00
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
|
|
{
|
|
|
|
unsigned long limit = 1UL << (MAX_PHYSMEM_BITS - PAGE_SHIFT);
|
|
|
|
unsigned long pfn = res->start >> PAGE_SHIFT;
|
|
|
|
|
|
|
|
if (pfn > limit) {
|
|
|
|
pr_err("New System RAM resource outside addressable RAM (%lu > %lu)\n",
|
|
|
|
pfn, limit);
|
|
|
|
release_memory_resource(res);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2015-06-24 22:58:42 +08:00
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2015-06-25 19:10:28 +08:00
|
|
|
static enum bp_state reserve_additional_memory(void)
|
2011-07-26 08:12:06 +08:00
|
|
|
{
|
2015-06-25 19:10:28 +08:00
|
|
|
long credit;
|
2015-06-24 22:58:42 +08:00
|
|
|
struct resource *resource;
|
2011-07-26 08:12:06 +08:00
|
|
|
int nid, rc;
|
2015-06-24 22:58:42 +08:00
|
|
|
unsigned long balloon_hotplug;
|
2011-07-26 08:12:06 +08:00
|
|
|
|
2015-06-25 23:29:18 +08:00
|
|
|
credit = balloon_stats.target_pages + balloon_stats.target_unpopulated
|
|
|
|
- balloon_stats.total_pages;
|
2015-06-25 19:10:28 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Already hotplugged enough pages? Wait for them to be
|
|
|
|
* onlined.
|
|
|
|
*/
|
|
|
|
if (credit <= 0)
|
|
|
|
return BP_WAIT;
|
|
|
|
|
2015-06-24 22:58:42 +08:00
|
|
|
balloon_hotplug = round_up(credit, PAGES_PER_SECTION);
|
|
|
|
|
|
|
|
resource = additional_memory_resource(balloon_hotplug * PAGE_SIZE);
|
|
|
|
if (!resource)
|
|
|
|
goto err;
|
|
|
|
|
|
|
|
nid = memory_add_physaddr_to_nid(resource->start);
|
2011-07-26 08:12:06 +08:00
|
|
|
|
2015-03-20 20:55:39 +08:00
|
|
|
#ifdef CONFIG_XEN_HAVE_PVMMU
|
2015-05-04 22:39:08 +08:00
|
|
|
/*
|
|
|
|
* We don't support PV MMU when Linux and Xen is using
|
|
|
|
* different page granularity.
|
|
|
|
*/
|
|
|
|
BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE);
|
|
|
|
|
2015-03-20 20:55:39 +08:00
|
|
|
/*
|
|
|
|
* add_memory() will build page tables for the new memory so
|
|
|
|
* the p2m must contain invalid entries so the correct
|
|
|
|
* non-present PTEs will be written.
|
|
|
|
*
|
|
|
|
* If a failure occurs, the original (identity) p2m entries
|
|
|
|
* are not restored since this region is now known not to
|
|
|
|
* conflict with any devices.
|
|
|
|
*/
|
|
|
|
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
|
|
|
|
unsigned long pfn, i;
|
|
|
|
|
2015-06-24 22:58:42 +08:00
|
|
|
pfn = PFN_DOWN(resource->start);
|
2015-03-20 20:55:39 +08:00
|
|
|
for (i = 0; i < balloon_hotplug; i++) {
|
|
|
|
if (!set_phys_to_machine(pfn + i, INVALID_P2M_ENTRY)) {
|
|
|
|
pr_warn("set_phys_to_machine() failed, no memory added\n");
|
2015-06-24 22:58:42 +08:00
|
|
|
goto err;
|
2015-03-20 20:55:39 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2016-03-16 05:56:52 +08:00
|
|
|
/*
|
|
|
|
* add_memory_resource() will call online_pages() which in its turn
|
|
|
|
* will call xen_online_page() callback causing deadlock if we don't
|
|
|
|
* release balloon_mutex here. Unlocking here is safe because the
|
|
|
|
* callers drop the mutex before trying again.
|
|
|
|
*/
|
|
|
|
mutex_unlock(&balloon_mutex);
|
2018-10-31 06:10:24 +08:00
|
|
|
/* add_memory_resource() requires the device_hotplug lock */
|
|
|
|
lock_device_hotplug();
|
2018-12-28 16:35:36 +08:00
|
|
|
rc = add_memory_resource(nid, resource);
|
2018-10-31 06:10:24 +08:00
|
|
|
unlock_device_hotplug();
|
2016-03-16 05:56:52 +08:00
|
|
|
mutex_lock(&balloon_mutex);
|
|
|
|
|
2011-07-26 08:12:06 +08:00
|
|
|
if (rc) {
|
2014-09-02 01:52:44 +08:00
|
|
|
pr_warn("Cannot add additional memory (%i)\n", rc);
|
2015-06-24 22:58:42 +08:00
|
|
|
goto err;
|
2011-07-26 08:12:06 +08:00
|
|
|
}
|
|
|
|
|
2015-06-25 19:08:20 +08:00
|
|
|
balloon_stats.total_pages += balloon_hotplug;
|
2011-07-26 08:12:06 +08:00
|
|
|
|
2015-06-25 19:10:28 +08:00
|
|
|
return BP_WAIT;
|
2015-06-24 22:58:42 +08:00
|
|
|
err:
|
|
|
|
release_memory_resource(resource);
|
|
|
|
return BP_ECANCELED;
|
2011-07-26 08:12:06 +08:00
|
|
|
}
|
|
|
|
|
2019-03-06 07:42:14 +08:00
|
|
|
static void xen_online_page(struct page *page, unsigned int order)
|
2011-07-26 08:12:06 +08:00
|
|
|
{
|
2019-03-06 07:42:14 +08:00
|
|
|
unsigned long i, size = (1 << order);
|
|
|
|
unsigned long start_pfn = page_to_pfn(page);
|
|
|
|
struct page *p;
|
2011-07-26 08:12:06 +08:00
|
|
|
|
2019-03-06 07:42:14 +08:00
|
|
|
pr_debug("Online %lu pages starting at pfn 0x%lx\n", size, start_pfn);
|
2011-07-26 08:12:06 +08:00
|
|
|
mutex_lock(&balloon_mutex);
|
2019-03-06 07:42:14 +08:00
|
|
|
for (i = 0; i < size; i++) {
|
|
|
|
p = pfn_to_page(start_pfn + i);
|
|
|
|
__online_page_set_limits(p);
|
2019-10-01 17:01:50 +08:00
|
|
|
balloon_append(p);
|
2019-03-06 07:42:14 +08:00
|
|
|
}
|
2011-07-26 08:12:06 +08:00
|
|
|
mutex_unlock(&balloon_mutex);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int xen_memory_notifier(struct notifier_block *nb, unsigned long val, void *v)
|
|
|
|
{
|
|
|
|
if (val == MEM_ONLINE)
|
|
|
|
schedule_delayed_work(&balloon_worker, 0);
|
|
|
|
|
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block xen_memory_nb = {
|
|
|
|
.notifier_call = xen_memory_notifier,
|
|
|
|
.priority = 0
|
|
|
|
};
|
|
|
|
#else
|
2015-06-25 19:10:28 +08:00
|
|
|
static enum bp_state reserve_additional_memory(void)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2015-06-25 19:08:20 +08:00
|
|
|
balloon_stats.target_pages = balloon_stats.current_pages;
|
2015-06-25 23:29:18 +08:00
|
|
|
return BP_ECANCELED;
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
2015-06-25 19:08:20 +08:00
|
|
|
#endif /* CONFIG_XEN_BALLOON_MEMORY_HOTPLUG */
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2015-06-25 19:08:20 +08:00
|
|
|
static long current_credit(void)
|
2011-07-26 08:12:06 +08:00
|
|
|
{
|
2015-06-25 19:08:20 +08:00
|
|
|
return balloon_stats.target_pages - balloon_stats.current_pages;
|
2011-07-26 08:12:06 +08:00
|
|
|
}
|
|
|
|
|
2015-06-25 19:08:20 +08:00
|
|
|
static bool balloon_is_inflated(void)
|
2011-07-26 08:12:06 +08:00
|
|
|
{
|
2015-06-25 19:08:20 +08:00
|
|
|
return balloon_stats.balloon_low || balloon_stats.balloon_high;
|
2011-07-26 08:12:06 +08:00
|
|
|
}
|
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
static enum bp_state increase_reservation(unsigned long nr_pages)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2011-03-09 05:48:24 +08:00
|
|
|
int rc;
|
2015-05-04 22:39:08 +08:00
|
|
|
unsigned long i;
|
2008-04-03 01:54:13 +08:00
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
if (nr_pages > ARRAY_SIZE(frame_list))
|
|
|
|
nr_pages = ARRAY_SIZE(frame_list);
|
|
|
|
|
2013-11-13 20:59:58 +08:00
|
|
|
page = list_first_entry_or_null(&ballooned_pages, struct page, lru);
|
2008-04-03 01:54:13 +08:00
|
|
|
for (i = 0; i < nr_pages; i++) {
|
2011-03-09 05:48:24 +08:00
|
|
|
if (!page) {
|
|
|
|
nr_pages = i;
|
|
|
|
break;
|
|
|
|
}
|
2015-05-04 22:39:08 +08:00
|
|
|
|
|
|
|
frame_list[i] = page_to_xen_pfn(page);
|
2008-04-03 01:54:13 +08:00
|
|
|
page = balloon_next_page(page);
|
|
|
|
}
|
|
|
|
|
2018-07-20 17:01:44 +08:00
|
|
|
rc = xenmem_reservation_increase(nr_pages, frame_list);
|
2011-03-14 23:42:40 +08:00
|
|
|
if (rc <= 0)
|
2011-03-09 05:48:24 +08:00
|
|
|
return BP_EAGAIN;
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2009-06-05 18:58:37 +08:00
|
|
|
for (i = 0; i < rc; i++) {
|
2011-03-15 22:23:57 +08:00
|
|
|
page = balloon_retrieve(false);
|
2008-04-03 01:54:13 +08:00
|
|
|
BUG_ON(page == NULL);
|
|
|
|
|
2018-07-20 17:01:44 +08:00
|
|
|
xenmem_reservation_va_mapping_update(1, &page, &frame_list[i]);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
|
|
|
/* Relinquish the page back to the allocator. */
|
2016-12-10 01:10:22 +08:00
|
|
|
free_reserved_page(page);
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
|
|
|
|
2009-06-05 18:58:37 +08:00
|
|
|
balloon_stats.current_pages += rc;
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
return BP_DONE;
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2011-03-09 05:48:24 +08:00
|
|
|
enum bp_state state = BP_DONE;
|
2015-05-04 22:39:08 +08:00
|
|
|
unsigned long i;
|
|
|
|
struct page *page, *tmp;
|
2008-04-03 01:54:13 +08:00
|
|
|
int ret;
|
2015-05-04 22:39:08 +08:00
|
|
|
LIST_HEAD(pages);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
|
|
|
if (nr_pages > ARRAY_SIZE(frame_list))
|
|
|
|
nr_pages = ARRAY_SIZE(frame_list);
|
|
|
|
|
|
|
|
for (i = 0; i < nr_pages; i++) {
|
2013-05-16 13:59:40 +08:00
|
|
|
page = alloc_page(gfp);
|
|
|
|
if (page == NULL) {
|
2008-04-03 01:54:13 +08:00
|
|
|
nr_pages = i;
|
2011-03-09 05:48:24 +08:00
|
|
|
state = BP_EAGAIN;
|
2008-04-03 01:54:13 +08:00
|
|
|
break;
|
|
|
|
}
|
2016-12-10 01:10:22 +08:00
|
|
|
adjust_managed_page_count(page, -1);
|
2018-07-20 17:01:44 +08:00
|
|
|
xenmem_reservation_scrub_page(page);
|
2015-05-04 22:39:08 +08:00
|
|
|
list_add(&page->lru, &pages);
|
2014-03-16 00:11:47 +08:00
|
|
|
}
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2014-03-16 00:11:47 +08:00
|
|
|
/*
|
|
|
|
* Ensure that ballooned highmem pages don't have kmaps.
|
|
|
|
*
|
|
|
|
* Do this before changing the p2m as kmap_flush_unused()
|
|
|
|
* reads PTEs to obtain pages (and hence needs the original
|
|
|
|
* p2m entry).
|
|
|
|
*/
|
|
|
|
kmap_flush_unused();
|
|
|
|
|
2015-05-04 22:39:08 +08:00
|
|
|
/*
|
|
|
|
* Setup the frame, update direct mapping, invalidate P2M,
|
|
|
|
* and add to balloon.
|
|
|
|
*/
|
|
|
|
i = 0;
|
|
|
|
list_for_each_entry_safe(page, tmp, &pages, lru) {
|
|
|
|
frame_list[i++] = xen_page_to_gfn(page);
|
2009-01-23 06:36:08 +08:00
|
|
|
|
2018-07-20 17:01:44 +08:00
|
|
|
xenmem_reservation_va_mapping_reset(1, &page);
|
2015-05-04 22:39:08 +08:00
|
|
|
|
|
|
|
list_del(&page->lru);
|
2013-09-20 00:14:53 +08:00
|
|
|
|
2014-03-16 00:11:47 +08:00
|
|
|
balloon_append(page);
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
|
|
|
|
2013-09-20 00:14:53 +08:00
|
|
|
flush_tlb_all();
|
2013-09-12 01:45:44 +08:00
|
|
|
|
2018-07-20 17:01:44 +08:00
|
|
|
ret = xenmem_reservation_decrease(nr_pages, frame_list);
|
2008-04-03 01:54:13 +08:00
|
|
|
BUG_ON(ret != nr_pages);
|
|
|
|
|
|
|
|
balloon_stats.current_pages -= nr_pages;
|
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
return state;
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2015-07-20 19:49:39 +08:00
|
|
|
* As this is a work item it is guaranteed to run as a single instance only.
|
2008-04-03 01:54:13 +08:00
|
|
|
* We may of course race updates of the target counts (which are protected
|
|
|
|
* by the balloon lock), or with changes to the Xen hard limit, but we will
|
|
|
|
* recover from these in time.
|
|
|
|
*/
|
|
|
|
static void balloon_process(struct work_struct *work)
|
|
|
|
{
|
2011-03-09 05:48:24 +08:00
|
|
|
enum bp_state state = BP_DONE;
|
2008-04-03 01:54:13 +08:00
|
|
|
long credit;
|
|
|
|
|
|
|
|
|
|
|
|
do {
|
2015-07-20 19:49:39 +08:00
|
|
|
mutex_lock(&balloon_mutex);
|
|
|
|
|
2011-03-28 17:34:10 +08:00
|
|
|
credit = current_credit();
|
2011-03-09 05:48:24 +08:00
|
|
|
|
2011-07-26 08:12:06 +08:00
|
|
|
if (credit > 0) {
|
|
|
|
if (balloon_is_inflated())
|
|
|
|
state = increase_reservation(credit);
|
|
|
|
else
|
2015-06-25 19:10:28 +08:00
|
|
|
state = reserve_additional_memory();
|
2011-07-26 08:12:06 +08:00
|
|
|
}
|
2011-03-09 05:48:24 +08:00
|
|
|
|
2019-06-19 17:00:56 +08:00
|
|
|
if (credit < 0) {
|
|
|
|
long n_pages;
|
|
|
|
|
|
|
|
n_pages = min(-credit, si_mem_available());
|
|
|
|
state = decrease_reservation(n_pages, GFP_BALLOON);
|
|
|
|
if (state == BP_DONE && n_pages != -credit &&
|
|
|
|
n_pages < totalreserve_pages)
|
|
|
|
state = BP_EAGAIN;
|
|
|
|
}
|
2011-03-09 05:48:24 +08:00
|
|
|
|
|
|
|
state = update_schedule(state);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2015-07-20 19:49:39 +08:00
|
|
|
mutex_unlock(&balloon_mutex);
|
|
|
|
|
|
|
|
cond_resched();
|
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
} while (credit && state == BP_DONE);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
|
|
|
/* Schedule more work if there is some still to be done. */
|
2011-03-09 05:48:24 +08:00
|
|
|
if (state == BP_EAGAIN)
|
|
|
|
schedule_delayed_work(&balloon_worker, balloon_stats.schedule_delay * HZ);
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Resets the Xen limit, sets new target, and kicks off processing. */
|
2011-03-14 23:29:37 +08:00
|
|
|
void balloon_set_new_target(unsigned long target)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
|
|
|
/* No need for lock. Not read-modify-write updates. */
|
|
|
|
balloon_stats.target_pages = target;
|
2011-03-09 05:47:39 +08:00
|
|
|
schedule_delayed_work(&balloon_worker, 0);
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
2011-03-14 23:29:37 +08:00
|
|
|
EXPORT_SYMBOL_GPL(balloon_set_new_target);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2015-06-25 23:29:18 +08:00
|
|
|
static int add_ballooned_pages(int nr_pages)
|
|
|
|
{
|
|
|
|
enum bp_state st;
|
|
|
|
|
|
|
|
if (xen_hotplug_unpopulated) {
|
|
|
|
st = reserve_additional_memory();
|
|
|
|
if (st != BP_ECANCELED) {
|
|
|
|
mutex_unlock(&balloon_mutex);
|
|
|
|
wait_event(balloon_wq,
|
|
|
|
!list_empty(&ballooned_pages));
|
|
|
|
mutex_lock(&balloon_mutex);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-06-19 17:00:56 +08:00
|
|
|
if (si_mem_available() < nr_pages)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2015-06-25 23:29:18 +08:00
|
|
|
st = decrease_reservation(nr_pages, GFP_USER);
|
|
|
|
if (st != BP_DONE)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
/**
|
|
|
|
* alloc_xenballooned_pages - get pages that have been ballooned out
|
|
|
|
* @nr_pages: Number of pages to get
|
|
|
|
* @pages: pages returned
|
|
|
|
* @return 0 on success, error otherwise
|
|
|
|
*/
|
2015-06-25 20:12:46 +08:00
|
|
|
int alloc_xenballooned_pages(int nr_pages, struct page **pages)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2011-03-15 22:23:57 +08:00
|
|
|
int pgno = 0;
|
2011-07-26 19:15:59 +08:00
|
|
|
struct page *page;
|
2015-06-25 23:29:18 +08:00
|
|
|
int ret;
|
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
mutex_lock(&balloon_mutex);
|
2015-06-25 23:29:18 +08:00
|
|
|
|
|
|
|
balloon_stats.target_unpopulated += nr_pages;
|
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
while (pgno < nr_pages) {
|
2015-06-25 20:12:46 +08:00
|
|
|
page = balloon_retrieve(true);
|
|
|
|
if (page) {
|
2011-03-15 22:23:57 +08:00
|
|
|
pages[pgno++] = page;
|
2015-07-22 21:50:37 +08:00
|
|
|
#ifdef CONFIG_XEN_HAVE_PVMMU
|
2015-05-04 22:39:08 +08:00
|
|
|
/*
|
|
|
|
* We don't support PV MMU when Linux and Xen is using
|
|
|
|
* different page granularity.
|
|
|
|
*/
|
|
|
|
BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE);
|
|
|
|
|
2017-08-24 06:27:04 +08:00
|
|
|
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
|
|
|
|
ret = xen_alloc_p2m_entry(page_to_pfn(page));
|
|
|
|
if (ret < 0)
|
|
|
|
goto out_undo;
|
|
|
|
}
|
2015-07-22 21:50:37 +08:00
|
|
|
#endif
|
2011-03-15 22:23:57 +08:00
|
|
|
} else {
|
2015-06-25 23:29:18 +08:00
|
|
|
ret = add_ballooned_pages(nr_pages - pgno);
|
|
|
|
if (ret < 0)
|
2011-03-15 22:23:57 +08:00
|
|
|
goto out_undo;
|
|
|
|
}
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
2011-03-15 22:23:57 +08:00
|
|
|
mutex_unlock(&balloon_mutex);
|
|
|
|
return 0;
|
|
|
|
out_undo:
|
|
|
|
mutex_unlock(&balloon_mutex);
|
2015-06-25 23:29:18 +08:00
|
|
|
free_xenballooned_pages(pgno, pages);
|
|
|
|
return ret;
|
2008-04-03 01:54:13 +08:00
|
|
|
}
|
2011-03-15 22:23:57 +08:00
|
|
|
EXPORT_SYMBOL(alloc_xenballooned_pages);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
/**
|
|
|
|
* free_xenballooned_pages - return pages retrieved with get_ballooned_pages
|
|
|
|
* @nr_pages: Number of pages
|
|
|
|
* @pages: pages to return
|
|
|
|
*/
|
2011-07-26 19:15:59 +08:00
|
|
|
void free_xenballooned_pages(int nr_pages, struct page **pages)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2011-03-15 22:23:57 +08:00
|
|
|
int i;
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
mutex_lock(&balloon_mutex);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
for (i = 0; i < nr_pages; i++) {
|
2019-10-01 17:01:51 +08:00
|
|
|
if (pages[i])
|
2011-03-15 22:23:57 +08:00
|
|
|
balloon_append(pages[i]);
|
|
|
|
}
|
|
|
|
|
2015-06-25 23:29:18 +08:00
|
|
|
balloon_stats.target_unpopulated -= nr_pages;
|
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
/* The balloon may be too large now. Shrink it if needed. */
|
2011-03-28 17:34:10 +08:00
|
|
|
if (current_credit())
|
2011-03-15 22:23:57 +08:00
|
|
|
schedule_delayed_work(&balloon_worker, 0);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-03-15 22:23:57 +08:00
|
|
|
mutex_unlock(&balloon_mutex);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(free_xenballooned_pages);
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2017-03-15 01:35:53 +08:00
|
|
|
#ifdef CONFIG_XEN_PV
|
2011-09-29 00:46:34 +08:00
|
|
|
static void __init balloon_add_region(unsigned long start_pfn,
|
|
|
|
unsigned long pages)
|
2008-04-03 01:54:13 +08:00
|
|
|
{
|
2011-03-28 17:33:18 +08:00
|
|
|
unsigned long pfn, extra_pfn_end;
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-09-29 00:46:34 +08:00
|
|
|
/*
|
|
|
|
* If the amount of usable memory has been limited (e.g., with
|
|
|
|
* the 'mem' command line parameter), don't add pages beyond
|
|
|
|
* this limit.
|
|
|
|
*/
|
|
|
|
extra_pfn_end = min(max_pfn, start_pfn + pages);
|
|
|
|
|
|
|
|
for (pfn = start_pfn; pfn < extra_pfn_end; pfn++) {
|
|
|
|
/* totalram_pages and totalhigh_pages do not
|
|
|
|
include the boot-time balloon extension, so
|
|
|
|
don't subtract from it. */
|
2019-10-01 17:01:51 +08:00
|
|
|
balloon_append(pfn_to_page(pfn));
|
2011-09-29 00:46:34 +08:00
|
|
|
}
|
2015-06-25 19:08:20 +08:00
|
|
|
|
|
|
|
balloon_stats.total_pages += extra_pfn_end - start_pfn;
|
2011-09-29 00:46:34 +08:00
|
|
|
}
|
2017-03-15 01:35:53 +08:00
|
|
|
#endif
|
2011-09-29 00:46:34 +08:00
|
|
|
|
|
|
|
static int __init balloon_init(void)
|
|
|
|
{
|
2010-12-03 01:55:05 +08:00
|
|
|
if (!xen_domain())
|
2008-04-03 01:54:13 +08:00
|
|
|
return -ENODEV;
|
|
|
|
|
2013-06-28 18:21:41 +08:00
|
|
|
pr_info("Initialising balloon driver\n");
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2017-03-15 01:35:53 +08:00
|
|
|
#ifdef CONFIG_XEN_PV
|
2011-09-29 00:46:32 +08:00
|
|
|
balloon_stats.current_pages = xen_pv_domain()
|
|
|
|
? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
|
2013-11-07 04:37:40 +08:00
|
|
|
: get_num_physpages();
|
2017-03-15 01:35:53 +08:00
|
|
|
#else
|
|
|
|
balloon_stats.current_pages = get_num_physpages();
|
|
|
|
#endif
|
2008-04-03 01:54:13 +08:00
|
|
|
balloon_stats.target_pages = balloon_stats.current_pages;
|
|
|
|
balloon_stats.balloon_low = 0;
|
|
|
|
balloon_stats.balloon_high = 0;
|
2015-06-25 19:08:20 +08:00
|
|
|
balloon_stats.total_pages = balloon_stats.current_pages;
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-03-09 05:48:24 +08:00
|
|
|
balloon_stats.schedule_delay = 1;
|
|
|
|
balloon_stats.max_schedule_delay = 32;
|
|
|
|
balloon_stats.retry_count = 1;
|
2019-06-19 17:00:56 +08:00
|
|
|
balloon_stats.max_retry_count = 4;
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2011-07-26 08:12:06 +08:00
|
|
|
#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
|
|
|
|
set_online_page_callback(&xen_online_page);
|
|
|
|
register_memory_notifier(&xen_memory_nb);
|
2015-06-25 23:29:18 +08:00
|
|
|
register_sysctl_table(xen_root);
|
2011-07-26 08:12:06 +08:00
|
|
|
#endif
|
|
|
|
|
2017-03-15 01:35:53 +08:00
|
|
|
#ifdef CONFIG_XEN_PV
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialize the balloon with pages from the extra memory
|
|
|
|
* regions (see arch/x86/xen/setup.c).
|
|
|
|
*/
|
|
|
|
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
|
|
|
|
if (xen_extra_mem[i].n_pfns)
|
|
|
|
balloon_add_region(xen_extra_mem[i].start_pfn,
|
|
|
|
xen_extra_mem[i].n_pfns);
|
|
|
|
}
|
|
|
|
#endif
|
2008-04-03 01:54:13 +08:00
|
|
|
|
2017-07-10 16:10:45 +08:00
|
|
|
/* Init the xen-balloon driver. */
|
|
|
|
xen_balloon_init();
|
|
|
|
|
2008-04-03 01:54:13 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
subsys_initcall(balloon_init);
|