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    1d988ed4
    x86/xen: dont add memory above max allowed allocation · 1d988ed4
    Juergen Gross authored
    
    
    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: default avatarJuergen Gross <jgross@suse.com>
    Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
    Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
    1d988ed4
    x86/xen: dont add memory above max allowed allocation
    Juergen Gross authored
    
    
    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: default avatarJuergen Gross <jgross@suse.com>
    Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
    Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
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