On 2015/8/12 17:11, Julien Grall wrote:
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?
No, I just use xzalloc_bytes to allocate some place and copy ACPI to the
allocated place, modify the content, then call
raw_copy_to_guest_flush_dcache to copy the modified tables to guest memory.
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,
--
Shannon
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