On 01/02/2021 09:37, Jan Beulich wrote:
> On 30.01.2021 03:59, Andrew Cooper wrote:
>> On 30/01/2021 01:59, Tamas K Lengyel wrote:
>>> When using gdbsx dbg_rw_guest_mem is used to read/write guest memory. When
>>> the
>>> buffer being accessed is on a page-boundary, the next page needs to be
>>> grabbed
>>> to access the correct memory for the buffer's overflown parts. While
>>> dbg_rw_guest_mem has logic to handle that, it broke with 229492e210a.
>>> Instead
>>> of grabbing the next page the code right now is looping back to the
>>> start of the first page. This results in errors like the following while
>>> trying
>>> to use gdb with Linux' lx-dmesg:
>>>
>>> [ 0.114457] PM: hibernation: Registered nosave memory: [mem
>>> 0xfdfff000-0xffffffff]
>>> [ 0.114460] [mem 0x90000000-0xfbffffff] available for PCI demem 0
>>> [ 0.114462] f]f]
>>> Python Exception <class 'ValueError'> embedded null character:
>>> Error occurred in Python: embedded null character
>>>
>>> Fixing this bug by taking the variable assignment outside the loop.
>>>
>>> Signed-off-by: Tamas K Lengyel <ta...@tklengyel.com>
>> Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com>
> I have to admit that I'm irritated: On January 14th I did submit
> a patch ('x86/gdbsx: convert "user" to "guest" accesses') fixing this
> as a side effect. I understand that one was taking care of more
> issues here, but shouldn't that be preferred? Re-basing isn't going
> to be overly difficult, but anyway.
I'm sorry. That was sent during the period where I had no email access
(hence I wasn't aware of it - I've been focusing on 4.15 work and this
series wasn't pinged.), but it also isn't identified as a bugfix, or
suitable for backporting in that form.
I apologise for the extra work caused unintentionally, but I think this
is the correct way around WRT backports, is it not?
~Andrew
