[PATCH 00/35] kasan: add hardware tag-based mode for arm64

[Derrick McKee]

On 9/14/20 5:36 PM, Derrick McKee wrote:
> On 9/14/20 4:04 PM, Andrey Konovalov wrote:
>> One needs to use the latest QEMU master and provide "-machine
>> virt,mte=on -cpu max" arguments to it. I'll add this information into
>> the cover letter for v2.
> 
> I am using the latest QEMU as of Sep. 8, and starting the system with 
> virt,mte=on, and I have also checked that the appropriate bits are set 
> in sctlr_el1 and ID_AA64PFR1_EL1. Finally, when I print out the tag 
> immediately before and after mte_assign_mem_tag_range I get the same 
> result.

I should also mention that CONFIG_KASAN_HW_TAGS=n in my configuration, 
but I have added my own macro to enable my code and added it to the 
conditional macro in memory.h:224.  I have also ensured that 
mte_init_tags is called from setup_arch.  But still the result of the 
ldg instruction to get the address tag is always 0, despite the desired 
tag of 2.  Perhaps I am missing some other needed setup or configuration?