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Wed, 15 Apr 2020 09:13:53 -0400 (EDT) Date: Wed, 15 Apr 2020 15:13:51 +0200 From: Greg KH To: Andrew Donnellan Subject: Re: [PATCH 4.19] powerpc/powernv/idle: Restore AMR/UAMOR/AMOR after idle Message-ID: <20200415131351.GB3439691@kroah.com> References: <20200415124005.26920-1-ajd@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200415124005.26920-1-ajd@linux.ibm.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, stable@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, Apr 15, 2020 at 10:40:05PM +1000, Andrew Donnellan wrote: > From: Michael Ellerman > > commit 53a712bae5dd919521a58d7bad773b949358add0 upstream. > > In order to implement KUAP (Kernel Userspace Access Protection) on > Power9 we will be using the AMR, and therefore indirectly the > UAMOR/AMOR. > > So save/restore these regs in the idle code. > > Signed-off-by: Michael Ellerman > [ajd: Backport to 4.19 tree, CVE-2020-11669] > Signed-off-by: Andrew Donnellan > --- > arch/powerpc/kernel/idle_book3s.S | 27 +++++++++++++++++++++++---- > 1 file changed, 23 insertions(+), 4 deletions(-) This and the 4.14 patch now queued up, thanks. greg k-h