[PATCH Makedumpfile 0/4] x86_64: Fix page_offset for randomized base enabled

[Pratyush Anand]

Hi Louis,

On Tue, Oct 25, 2016 at 2:47 PM, Louis Bouchard
<louis.bouchard at canonical.com> wrote:
> Hello,
>
> Le 24/10/2016 à 18:48, Pratyush Anand a écrit :
>> Patch 1/4 fixes page_offset calculation, so that it is correctly calculated
>> on KASLR enabled kernel as well.
>> Patch 2/4 simplifies VA to PA translation. New code has been benchmarked
>> against old code on a 4T system.
>> Patch 3/4 and 4/4 is removal of (now) unnecessary code.
>>
>> I think, we should find a way to kill find_vememmap() as well, so that
>> VMEMMAP_START can be removed. I have very limited idea about x86, so unable
>> to do that as of now.
>>
>> Pratyush Anand (4):
>>   x86_64: Calculate page_offset from pt_load
>>   x86_64: translate all VA to PA using page table values
>>   x86_64: kill is_vmalloc_addr_x86_64()
>>   x86_64: kill some unused initialization
>>
>>  arch/x86_64.c  | 84 ++++++++++++++++++++--------------------------------------
>>  makedumpfile.h |  9 +++----
>>  2 files changed, 32 insertions(+), 61 deletions(-)
>>
>
> Cross-posting but FYI, this patch fixes the issue reported in the following
> thread : makedumpfile issues many readpage_elf: Attempt to read non-existent page[1]
>
> It corresponds to the commit identified by my kernel bisection.
>
> I will wait until it is accepted in Kumagai-san's tree to include it in
> Debian/Ubuntu.

Thanks a lot for your testing.

~Pratyush