linux-kernel - Re: [PATCH 4.9 34/77] powerpc: fix build errors in stable tree

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Date:   Fri, 23 Feb 2018 00:16:34 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Yves-Alexis Perez <corsac@...ian.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH 4.9 34/77] powerpc: fix build errors in stable tree

Yves-Alexis Perez <corsac@...ian.org> writes:

> On Thu, 2018-02-22 at 12:01 +1100, Michael Ellerman wrote:
>> So I guess this patch is OK for now, but we do need a full back port of
>> 222f20f to 4.9.
>
> Hi,
>
> in the light of this, do you know the full status of protections against
> Meltdown on powerpc/ppc64el architecures on 4.9?

With the patches I just sent, for pseries and powernv, the mitigation
should be in place. On machines with updated firmware we'll use the
hardware-assisted L1 flush, otherwise we fallback to doing it in
software.

cheers