On Fri, 7 Jan 2022 23:19:03 +1100 David Gibson <da...@gibson.dropbear.id.au> wrote:
> On Fri, Jan 07, 2022 at 12:57:47PM +0100, Greg Kurz wrote: > > On Fri, 7 Jan 2022 18:24:23 +1100 > > Alexey Kardashevskiy <a...@ozlabs.ru> wrote: > > > > > "PowerPC Processor binding to IEEE 1275" says in > > > "8.2.1. Initial Register Values" that the initial state is defined as > > > 32bit so do it for both SLOF and VOF. > > > > > > This should not cause behavioral change as SLOF switches to 64bit very > > > early anyway. > > > > Only one CPU goes through SLOF. What about the other ones, including > > hot plugged CPUs ? > > Those will be started by the start-cpu RTAS call which has its own > semantics. > Ah indeed, there's code in linux/arch/powerpc/kernel/head_64.S to switch secondaries to 64bit... but then, as noted by Cedric, ppc_cpu_reset(), which is called earlier sets MSR_SF but the changelog of commit 8b9f2118ca40 doesn't provide much details on the motivation. Any idea ?
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