linux-kernel - [PATCH 3/3] MIPS: cpu-probe: Vulnerabilities for Loongson cores

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Date:   Wed, 30 Dec 2020 11:23:09 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        WANG Xuerui <git@...0n.name>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        周琰杰 (Zhou Yanjie) 
        <zhouyanjie@...yeetech.com>, Paul Cercueil <paul@...pouillou.net>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Huacai Chen <chenhc@...ote.com>, YunQiang Su <syq@...ian.org>,
        Liangliang Huang <huanglllzu@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] MIPS: cpu-probe: Vulnerabilities for Loongson cores

Loongson64C is known to be vulnerable to meltdown according to
PoC from Rui Wang <r@....cc>.

Loongson64G defended these side-channel attack by silicon.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.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