Don't allow memory to be added above the allowed maximum allocation
limit set by Xen.
Trying to do so would result in cases like the following:
[ 584.559652] ------------[ cut here ]------------
[ 584.564897] WARNING: CPU: 2 PID: 1 at ../arch/x86/xen/multicalls.c:129
xen_alloc_pte+0x1c7/0x390()
[ 584.575151] Modules linked in:
[ 584.578643] Supported: Yes
[ 584.581750] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.4.120-92.70-default
#1
[ 584.590000] Hardware name: Cisco Systems Inc UCSC-C460-M4/UCSC-C460-M4, BIOS
C460M4.4.0.1b.0.0629181419 06/29/2018
[ 584.601862] 0000000000000000 ffffffff813175a0 0000000000000000
ffffffff8184777c
[ 584.610200] ffffffff8107f4e1 ffff880487eb7000 ffff8801862b79c0
ffff88048608d290
[ 584.618537] 0000000000487eb7 ffffea0000000201 ffffffff81009de7
ffffffff81068561
[ 584.626876] Call Trace:
[ 584.629699] [<ffffffff81019ad9>] dump_trace+0x59/0x340
[ 584.635645] [<ffffffff81019eaa>] show_stack_log_lvl+0xea/0x170
[ 584.642391] [<ffffffff8101ac51>] show_stack+0x21/0x40
[ 584.648238] [<ffffffff813175a0>] dump_stack+0x5c/0x7c
[ 584.654085] [<ffffffff8107f4e1>] warn_slowpath_common+0x81/0xb0
[ 584.660932] [<ffffffff81009de7>] xen_alloc_pte+0x1c7/0x390
[ 584.667289] [<ffffffff810647f0>] pmd_populate_kernel.constprop.6+0x40/0x80
[ 584.675241] [<ffffffff815ecfe8>] phys_pmd_init+0x210/0x255
[ 584.681587] [<ffffffff815ed207>] phys_pud_init+0x1da/0x247
[ 584.687931] [<ffffffff815edb3b>] kernel_physical_mapping_init+0xf5/0x1d4
[ 584.695682] [<ffffffff815e9bdd>] init_memory_mapping+0x18d/0x380
[ 584.702631] [<ffffffff81064699>] arch_add_memory+0x59/0xf0
Signed-off-by: Juergen Gross <jgr...@suse.com>
---
arch/x86/xen/setup.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index d5f303c0e656..5929a6ba5c25 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -12,6 +12,7 @@
#include <linux/memblock.h>
#include <linux/cpuidle.h>
#include <linux/cpufreq.h>
+#include <linux/memory_hotplug.h>
#include <asm/elf.h>
#include <asm/vdso.h>
@@ -785,6 +786,10 @@ char * __init xen_memory_setup(void)
/* How many extra pages do we need due to remapping? */
max_pages += xen_foreach_remap_area(max_pfn, xen_count_remap_pages);
+#ifdef CONFIG_MEMORY_HOTPLUG
+ max_mem_size = PFN_PHYS(max_pages);
+#endif
+
if (max_pages > max_pfn)
extra_pages += max_pages - max_pfn;
--
2.16.4
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