From 29e8910a566aad3ee72f729e45842858d51ced8d Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 18 Sep 2020 12:25:40 +0100 Subject: KVM: arm64: Simplify handling of ARCH_WORKAROUND_2 Owing to the fact that the host kernel is always mitigated, we can drastically simplify the WA2 handling by keeping the mitigation state ON when entering the guest. This means the guest is either unaffected or not mitigated. This results in a nice simplification of the mitigation space, and the removal of a lot of code that was never really used anyway. Signed-off-by: Marc Zyngier Signed-off-by: Will Deacon --- arch/arm64/kernel/cpu_errata.c | 14 -------------- 1 file changed, 14 deletions(-) (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 7fc54c3d4285..7e9caef13db4 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -108,20 +108,6 @@ cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *cap) int ssbd_state __read_mostly = ARM64_SSBD_UNKNOWN; -void __init arm64_enable_wa2_handling(struct alt_instr *alt, - __le32 *origptr, __le32 *updptr, - int nr_inst) -{ - BUG_ON(nr_inst != 1); - /* - * Only allow mitigation on EL1 entry/exit and guest - * ARCH_WORKAROUND_2 handling if the SSBD state allows it to - * be flipped. - */ - if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL) - *updptr = cpu_to_le32(aarch64_insn_gen_nop()); -} - #ifdef CONFIG_ARM64_ERRATUM_1463225 DEFINE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa); -- cgit