From 275fa0ea2cf7a84450f9c0ec0d9e7ec168ed2e2d Mon Sep 17 00:00:00 2001 From: Steven Price Date: Mon, 16 Dec 2019 11:56:31 +0000 Subject: arm64: Workaround for Cortex-A55 erratum 1530923 Cortex-A55 erratum 1530923 allows TLB entries to be allocated as a result of a speculative AT instruction. This may happen in the middle of a guest world switch while the relevant VMSA configuration is in an inconsistent state, leading to erroneous content being allocated into TLBs. The same workaround as is used for Cortex-A76 erratum 1165522 (WORKAROUND_SPECULATIVE_AT_VHE) can be used here. Note that this mandates the use of VHE on affected parts. Acked-by: Marc Zyngier Signed-off-by: Steven Price Signed-off-by: Will Deacon --- arch/arm64/kernel/cpu_errata.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'arch/arm64/kernel/cpu_errata.c') diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 0332fca5564a..0bd2867f3248 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -762,6 +762,10 @@ static const struct midr_range erratum_speculative_at_vhe_list[] = { #ifdef CONFIG_ARM64_ERRATUM_1165522 /* Cortex A76 r0p0 to r2p0 */ MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0), +#endif +#ifdef CONFIG_ARM64_ERRATUM_1530923 + /* Cortex A55 r0p0 to r2p0 */ + MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 2, 0), #endif {}, }; @@ -895,7 +899,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = { #endif #ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT_VHE { - .desc = "ARM erratum 1165522", + .desc = "ARM errata 1165522, 1530923", .capability = ARM64_WORKAROUND_SPECULATIVE_AT_VHE, ERRATA_MIDR_RANGE_LIST(erratum_speculative_at_vhe_list), }, -- cgit v1.2.3