linux-kernel - Re: [PATCH v3 2/2] x86/xen: dont add memory above max allowed allocation

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Date:   Thu, 14 Feb 2019 14:41:17 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, x86@...nel.org, linux-mm@...ck.org
Cc:     sstabellini@...nel.org, hpa@...or.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de
Subject: Re: [PATCH v3 2/2] x86/xen: dont add memory above max allowed
 allocation

On 2/14/19 5:42 AM, Juergen Gross wrote:
> 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 <jgross@...e.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>