On Wed, 2016-10-12 at 22:39 -0700, Andy Lutomirski wrote:

In a pinch, I have these patches sitting around:

https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=0a39cfa6fbb5d5635c85253cc7d6b44b54822afd
https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=bf8cfa200b5a01383ea39fc8ce2f32909767baa8

That truly sounds like something we'd rather avoid in the TX/RX paths
though, which should perform well.

I don't like them, though.  I think it's rather silly that we can't
just pass virtual addresses to the crypto code.

I don't really understand it either, hence my question about the actual
crash. I'll try to reproduce it in a VM.

johannes