From e8dd556c74325f29597665c2c557a8ea699a0686 Mon Sep 17 00:00:00 2001 From: Tiezhu Yang Date: Tue, 24 Sep 2024 15:31:51 +0800 Subject: [PATCH] LoongArch: Enable generic CPU vulnerabilites support Currently, many architectures support generic CPU vulnerabilites, such as x86, arm64 and riscv: commit 61dc0f555b5c ("x86/cpu: Implement CPU vulnerabilites sysfs functions") commit 61ae1321f06c ("arm64: enable generic CPU vulnerabilites support") commit 0e3f3649d44b ("riscv: Enable generic CPU vulnerabilites support") All LoongArch CPUs (since Loongson-3A5000) implement a special mechanism in the processor core to prevent "Meltdown" and "Spectre" attacks, so it can enable generic CPU vulnerabilites support for LoongArch too. Without this patch, there are no user interfaces of vulnerabilities to check on LoongArch. The output of those files reflects the state of the CPUs in the system, the output value "Not affected" means "CPU is not affected by the vulnerability". Before: # cat /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow cat: /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow: No such file or directory # cat /sys/devices/system/cpu/vulnerabilities/spec_store_bypass cat: /sys/devices/system/cpu/vulnerabilities/spec_store_bypass: No such file or directory # cat /sys/devices/system/cpu/vulnerabilities/meltdown cat: /sys/devices/system/cpu/vulnerabilities/meltdown: No such file or directory After: # cat /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow Not affected # cat /sys/devices/system/cpu/vulnerabilities/spec_store_bypass Not affected # cat /sys/devices/system/cpu/vulnerabilities/meltdown Not affected Link: https://www.loongson.cn/EN/news/show?id=633 Signed-off-by: Tiezhu Yang Signed-off-by: Huacai Chen --- arch/loongarch/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 34531dc8a61f..b9d3c98efe18 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -82,6 +82,7 @@ config LOONGARCH select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_DEVICES + select GENERIC_CPU_VULNERABILITIES select GENERIC_ENTRY select GENERIC_GETTIMEOFDAY select GENERIC_IOREMAP if !ARCH_IOREMAP