From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@citrix.com>
Subject: Re: Design doc of adding ACPI support for arm64 on Xen
 - version 2
Date: Wed, 12 Aug 2015 10:11:28 +0100
Message-ID: <55CB0DC0.4020304@citrix.com>
References: <55C413D5.7000709@huawei.com> <55CAF41C.1090208@huawei.com>
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To: Shannon Zhao <zhaoshenglong@huawei.com>, xen-devel <xen-devel@lists.xen.org>, Jan Beulich <jbeulich@suse.com>, Stefano
	Stabellini <stefano.stabellini@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Parth Dixit <parth.dixit@linaro.org>, Christoffer Dall <christoffer.dall@linaro.org>, Shannon Zhao <shannon.zhao@linaro.org>
Cc: Hangaohuai <hangaohuai@huawei.com>, "Huangpeng (Peter)" <peter.huangpeng@huawei.com>
List-Id: xen-devel@lists.xenproject.org

On 12/08/2015 08:22, Shannon Zhao wrote:
> Hi,

Hi Shannon,

It's not part of the design discussion and we are avoiding to mix 
discussion. Can you please create another thread (or at least renaming 
the subject)?

> I'm working on re-spinning this patchset while encountering a werid
> problem about xzalloc_bytes.
>
> Since I need to copy some ACPI tables, I need to allocate some memory
> for it. So there are a few places calling xzalloc_bytes. And it fails at
> the fifth one. The log is shown as following:

Do you copy data in the newly allocated memory between 2 xzalloc_bytes?

The only thing I have in mind based on the log below is your are 
overriding the metadata of the memory allocator.

> (XEN) *** LOADING DOMAIN 0 ***
> (XEN) Loading kernel from boot module @ 00000008fa315000
> (XEN) Allocating 1:1 mappings totalling 256MB for dom0:
> (XEN) BANK[0] 0x00000090000000-0x000000a0000000 (256MB)
> (XEN) Grant table range: 0x00000087e00000-0x00000087e5b000
> (XEN) Loading zImage from 00000008fa315000 to
> 0000000090080000-00000000909e0ec8
> (XEN) Hypervisor Trap. HSR=0x96000044 EC=0x25 IL=1 Syndrome=0x44
> (XEN) CPU0: Unexpected Trap: Hypervisor
> (XEN) ----[ Xen-4.6-unstable  arm64  debug=y  Not tainted ]----
> (XEN) CPU:    0
> (XEN) PC:     0000000000238b78 xmem_pool_alloc+0x348/0x4b0
> (XEN) LR:     0000000000238960
> (XEN) SP:     00000000002bf4e0
> (XEN) CPSR:   20000249 MODE:64-bit EL2h (Hypervisor, handler)
>
> (XEN) Xen call trace:
> (XEN)    [<0000000000238b78>] xmem_pool_alloc+0x348/0x4b0 (PC)
> (XEN)    [<0000000000238960>] xmem_pool_alloc+0x130/0x4b0 (LR)
> (XEN)    [<0000000000239100>] _xmalloc+0xf4/0x290
> (XEN)    [<00000000002392b0>] _xzalloc+0x14/0x38
> (XEN)    [<0000000000245430>] construct_dom0+0xbc0/0x14cc
> (XEN)    [<000000000028c4c4>] start_xen+0xbf4/0xcb0
> (XEN)    [<000000000020060c>] paging+0x84/0xbc
> (XEN)
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) CPU0: Unexpected Trap: Hypervisor
> (XEN)
> (XEN) ****************************************
> (XEN)
> (XEN) Reboot in five seconds...
>

Regards,

-- 
Julien Grall