On Wed, May 31, 2017 at 07:31:53PM +0300, Andrey Ryabinin wrote: > On 05/31/2017 08:50 AM, Joonsoo Kim wrote: > >>> But the main win as I see it is that that's basically complete support > >>> for 32-bit arches. People do ask about arm32 support: > >>> https://groups.google.com/d/msg/kasan-dev/Sk6BsSPMRRc/Gqh4oD_wAAAJ > >>> https://groups.google.com/d/msg/kasan-dev/B22vOFp-QWg/EVJPbrsgAgAJ > >>> and probably mips32 is relevant as well. > >> > >> I don't see how above is relevant for 32-bit arches. Current design > >> is perfectly fine for 32-bit arches. I did some POC arm32 port couple years > >> ago - https://github.com/aryabinin/linux/commits/kasan/arm_v0_1 > >> It has some ugly hacks and non-critical bugs. AFAIR it also super-slow > >> because I (mistakenly) > >> made shadow memory uncached. But otherwise it works. > > > > Could you explain that where is the code to map shadow memory uncached? > > I don't find anything related to it. > > > > I didn't set set any cache policy (L_PTE_MT_*) on shadow mapping (see > set_pte_at() calls ) > which means it's L_PTE_MT_UNCACHED
Thanks for pointing it out. I did some quick tests and found that it's not super(?) slow on my QEMU. Maybe, it would be different with real machine. Thanks.
