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From:   Diana Madalina Craciun <diana.craciun@nxp.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Sasha Levin <sashal@kernel.org>
Subject: Re: [PATCH 4.9 20/76] powerpc/64: Disable the speculation barrier
 from the command line
Thread-Topic: [PATCH 4.9 20/76] powerpc/64: Disable the speculation barrier
 from the command line
Thread-Index: AQHU9GspWTZ2wufWykODQsLkIlslGQ==
Date:   Tue, 16 Apr 2019 15:43:40 +0000
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References: <20190415183707.712011689@linuxfoundation.org>
 <20190415183712.869759410@linuxfoundation.org>
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Hi,=0A=
=0A=
I have tested the patches on NXP platforms and they worked as expected.=0A=
=0A=
Diana=0A=
=0A=
On 4/15/2019 9:45 PM, Greg Kroah-Hartman wrote:=0A=
> commit cf175dc315f90185128fb061dc05b6fbb211aa2f upstream.=0A=
>=0A=
> The speculation barrier can be disabled from the command line=0A=
> with the parameter: "nospectre_v1".=0A=
>=0A=
> Signed-off-by: Diana Craciun <diana.craciun@nxp.com>=0A=
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>=0A=
> Signed-off-by: Sasha Levin <sashal@kernel.org>=0A=
> ---=0A=
>  arch/powerpc/kernel/security.c | 12 +++++++++++-=0A=
>  1 file changed, 11 insertions(+), 1 deletion(-)=0A=
>=0A=
> diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/securit=
y.c=0A=
> index bf298d0c475f..813e38ff81ce 100644=0A=
> --- a/arch/powerpc/kernel/security.c=0A=
> +++ b/arch/powerpc/kernel/security.c=0A=
> @@ -17,6 +17,7 @@=0A=
>  unsigned long powerpc_security_features __read_mostly =3D SEC_FTR_DEFAUL=
T;=0A=
>=0A=
>  bool barrier_nospec_enabled;=0A=
> +static bool no_nospec;=0A=
>=0A=
>  static void enable_barrier_nospec(bool enable)=0A=
>  {=0A=
> @@ -43,9 +44,18 @@ void setup_barrier_nospec(void)=0A=
>         enable =3D security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&=0A=
>                  security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR);=0A=
>=0A=
> -       enable_barrier_nospec(enable);=0A=
> +       if (!no_nospec)=0A=
> +               enable_barrier_nospec(enable);=0A=
>  }=0A=
>=0A=
> +static int __init handle_nospectre_v1(char *p)=0A=
> +{=0A=
> +       no_nospec =3D true;=0A=
> +=0A=
> +       return 0;=0A=
> +}=0A=
> +early_param("nospectre_v1", handle_nospectre_v1);=0A=
> +=0A=
>  #ifdef CONFIG_DEBUG_FS=0A=
>  static int barrier_nospec_set(void *data, u64 val)=0A=
>  {=0A=
> --=0A=
> 2.19.1=0A=
>=0A=
>=0A=
>=0A=
>=0A=
=0A=