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

[Greg Kroah-Hartman]

From: Hanjun Guo <hanjun.guo@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Reviewed-by: John Garry <john.garry@xxxxxxxxxx>
Reviewed-by: Zhangshaokun <zhangshaokun@xxxxxxxxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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