Messages in this thread | | | From | Linus Walleij <> | Date | Wed, 22 Dec 2021 03:31:10 +0100 | Subject | Re: [PATCH -next 0/3] replace open coded VA->PA calculation |
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On Tue, Dec 21, 2021 at 10:16 AM Arnd Bergmann <arnd@arndb.de> wrote:
> I think for CPUs that can use LPAE, we want to eventually move to the 4G:4G > memory model, which in turn depends on having the kernel in vmalloc space, as > implemented by Linus Walleij in > https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git/log/?h=kernel-in-vmalloc-v5.14-rc1
Yeah I'm still working on this series. The 4/4 split works pretty well, but it breaks KASan and I was in the process of fixing that when I left for parental leave.
The reason it breaks would be related to KASan not expecting executable code in the vmalloc area, and since the shadowing algorithm is a simple pointer offset, and since we go to lengths to chisel shadow memory out of lowmem at a fixed offset from TEXT_OFFSET, we have a problem.
The patch "KASAN horror" shows what I am trying to do to fix it, it's "just" some hard work missing.
Yours, Linus Walleij
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