On Mon, Jan 8, 2018 at 7:27 PM, Matthew Miller <mat...@fedoraproject.org> wrote: > On Mon, Jan 08, 2018 at 04:49:44PM -0600, Justin Forbes wrote: >> combination of the 2. Unfortunately both have external requirements. >> Retpoline requires GCC patches, and microcode updates for some CPUs. >> IBRS requires microcode updates. While RHEL has done quite a bit of > > Does this mean we should do a mass rebuild once those patches have > landed? We have a mass rebuild scheduled for Jan 31st (basically three > weeks from now). Is that too soon? > I do not have an answer to this just yet. I mean theoretically yes, retpoline goes into GCC, packages are changed to use the features, and a mass rebuild happens. More likely retpoline goes into gcc, and a subset of important packages are rebuilt to utilize it. As for timing, no clue. When I asked Jakub about retpoline for Fedora gcc, he said the patches hadn't even been posted to the gcc list for review yet. That has now happened, but I haven't been following the review on that end yet. I am hoping to get some more answers on retpoline over the next couple of days.
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