Re: meltdown

[Michael <macallan%netbsd.org@localhost>]

Hello,

On Sat, 6 Jan 2018 07:33:50 +0000
maya%netbsd.org@localhost wrote:

> Loongson-2 had an issue where from branch prediction it would prefetch
> instructions from the I/O area and deadlock.
> 
> This happened in normal usage so we build the kernel with a binutils
> flag to output different jumps and flush the BTB on kernel entry.*

I remember when we added support for those flags to our gcc & binutils.

> I wouldn't count on MIPS CPUs to hold under the same level of scrutiny
> as x86 CPUs, luckily they're pretty obscure (and most probably aren't
> speculative).

Yeah, I doubt there are a lot of IRIX servers left, and embedded MIPS
is probably safe ;)

have fun
Michael