Hi Marc On Sat, Jan 20, 2018 at 11:42 AM, Marc Zyngier <[email protected]> wrote: > On Fri, 19 Jan 2018 16:56:14 -0500 > Tom Rini <[email protected]> wrote: > >> Hey all, >> >> So, now that things have quieted down a little bit in this area, I've >> been wondering about something. Over on the U-Boot side of things, are >> there changes we need to make in order to support the kernel side of the >> various mitigations properly? I know that for example currently >> https://developer.arm.com/support/security-update talks about ATF >> patches, in the context of AArch64 however. But on the other hand for >> variant 2, there's nothing listed on the Linux side for 32bit ARM, but >> there is for non-Linux OSes. >> >> And, in the event I'm also missing something else entirely that we need >> to do here, is there something that we need to be doing? Or is it still >> too early at this point in time to know? > > I've so far posted two revisions of a small patch series that deals > with variant-2 on the affected 32bit Cortex-A cores. These patches are > currently stashed on the branch[1] pointed at by the web page you > mentioned. > > A prerequisite for Cortex-A8 and A15 is that ACTLR[0] (IBE) is set from > secure mode. Cortex-A12/A17 do not need this.
So IBE is not a pre-requisite for Cortex A9 family. Is this correct? I have already back--ported those patches on kernel 3.4. Is those enough? Michael > > Thanks, > > M. > > [1] > https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=kpti > -- > Without deviation from the norm, progress is not possible. > _______________________________________________ > U-Boot mailing list > [email protected] > https://lists.denx.de/listinfo/u-boot -- | Michael Nazzareno Trimarchi Amarula Solutions BV | | COO - Founder Cruquiuskade 47 | | +31(0)851119172 Amsterdam 1018 AM NL | | [`as] http://www.amarulasolutions.com | _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
