linux-kernel - [PATCH 4.19 044/149] arm64: kpti: Whitelist HiSilicon Taishan v110 CPUs

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Date:   Mon,  4 Nov 2019 22:43:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hanjun Guo <hanjun.guo@...aro.org>,
        John Garry <john.garry@...wei.com>,
        Zhangshaokun <zhangshaokun@...ilicon.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 044/149] arm64: kpti: Whitelist HiSilicon Taishan v110 CPUs

From: Hanjun Guo <hanjun.guo@...aro.org>

[ Upstream commit 0ecc471a2cb7d4d386089445a727f47b59dc9b6e ]

HiSilicon Taishan v110 CPUs didn't implement CSV3 field of the
ID_AA64PFR0_EL1 and are not susceptible to Meltdown, so whitelist
the MIDR in kpti_safe_list[] table.

Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
Reviewed-by: John Garry <john.garry@...wei.com>
Reviewed-by: Zhangshaokun <zhangshaokun@...ilicon.com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm64/kernel/cpufeature.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index ff5beb59b3dc3..220ebfa0ece6e 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -906,6 +906,7 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry,
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
+		MIDR_ALL_VERSIONS(MIDR_HISI_TSV110),
 		{ /* sentinel */ }
 	};
 	char const *str = "kpti command line option";
-- 
2.20.1