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From: Huacai Chen <chenhuacai@kernel.org>
To: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: "open list:MIPS" <linux-mips@vger.kernel.org>,
	"Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
	"WANG Xuerui" <git@xen0n.name>,
	"Alexey Malahov" <Alexey.Malahov@baikalelectronics.ru>,
	"Serge Semin" <Sergey.Semin@baikalelectronics.ru>,
	"周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>,
	"Paul Cercueil" <paul@crapouillou.net>,
	"Tiezhu Yang" <yangtiezhu@loongson.cn>,
	"YunQiang Su" <syq@debian.org>,
	"Liangliang Huang" <huanglllzu@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/3] MIPS: cpu-probe: Vulnerabilities for Loongson cores
Date: Thu, 31 Dec 2020 08:33:15 +0800	[thread overview]
Message-ID: <CAAhV-H5JVAC4N6Pp6V7f9ZOGA6A=nZsQcYqc1S08ZaSOOazx1Q@mail.gmail.com> (raw)
In-Reply-To: <20201230032314.10042-3-jiaxun.yang@flygoat.com>

Hi, Jiaxun,

On Wed, Dec 30, 2020 at 11:26 AM Jiaxun Yang <jiaxun.yang@flygoat.com> wrote:
>
> Loongson64C is known to be vulnerable to meltdown according to
> PoC from Rui Wang <r@hev.cc>.
How about Loongson-3A1000/3B1500, and Loongson-2E/2F?

Huacai
>
> Loongson64G defended these side-channel attack by silicon.
>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> ---
>  arch/mips/kernel/cpu-probe.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
> index 2460783dbdb1..24b21f51353c 100644
> --- a/arch/mips/kernel/cpu-probe.c
> +++ b/arch/mips/kernel/cpu-probe.c
> @@ -2092,6 +2092,8 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
>                 c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
>                         MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2);
>                 c->ases &= ~MIPS_ASE_VZ; /* VZ of Loongson-3A2000/3000 is incomplete */
> +               c->vulnerabilities |= MIPS_VULNBL_MELTDOWN;
> +               c->vulnerable |= MIPS_VULNBL_MELTDOWN;
>                 break;
>         case PRID_IMP_LOONGSON_64G:
>                 c->cputype = CPU_LOONGSON64;
> @@ -2100,6 +2102,8 @@ static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
>                 set_isa(c, MIPS_CPU_ISA_M64R2);
>                 decode_cpucfg(c);
>                 c->writecombine = _CACHE_UNCACHED_ACCELERATED;
> +               c->vulnerabilities |= MIPS_VULNBL_MELTDOWN |
> +                             MIPS_VULNBL_SPECTRE_V1 | MIPS_VULNBL_SPECTRE_V2;
>                 break;
>         default:
>                 panic("Unknown Loongson Processor ID!");
> --
> 2.30.0
>

  reply	other threads:[~2020-12-31  0:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-30  3:23 [PATCH 1/3] MIPS: Add vulnerabilities infrastructure Jiaxun Yang
2020-12-30  3:23 ` [PATCH 2/3] MIPS: cpu-probe: Vulnerabilities for MIPS cores Jiaxun Yang
2020-12-31  0:31   ` Huacai Chen
2020-12-30  3:23 ` [PATCH 3/3] MIPS: cpu-probe: Vulnerabilities for Loongson cores Jiaxun Yang
2020-12-31  0:33   ` Huacai Chen [this message]
2020-12-31 15:43   ` WANG Xuerui
2020-12-31 16:09     ` Jiaxun Yang
2020-12-31  0:30 ` [PATCH 1/3] MIPS: Add vulnerabilities infrastructure Huacai Chen
2020-12-31 15:38 ` WANG Xuerui
2020-12-31 16:12   ` Jiaxun Yang

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