From: Steven Price <steven.price@arm.com> To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Cc: Marc Zyngier <marc.zyngier@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Steven Price <steven.price@arm.com> Subject: [RFC PATCH v2 04/12] arm/arm64: Make use of the SMCCC 1.1 wrapper Date: Wed, 12 Dec 2018 15:02:18 +0000 [thread overview] Message-ID: <20181212150226.38051-5-steven.price@arm.com> (raw) In-Reply-To: <20181212150226.38051-1-steven.price@arm.com> Rather than directly choosing which function to use based on psci_ops.conduit, use the new arm_smccc_1_1 wrapper instead. In some cases we still need to do some operations based on the conduit, but the code duplication is removed. Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm/mm/proc-v7-bugs.c | 46 +++++++++++++++------------------ arch/arm64/kernel/cpu_errata.c | 47 +++++++++------------------------- 2 files changed, 32 insertions(+), 61 deletions(-) diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c index 5544b82a2e7a..a9c7474d3e39 100644 --- a/arch/arm/mm/proc-v7-bugs.c +++ b/arch/arm/mm/proc-v7-bugs.c @@ -78,39 +78,33 @@ static void cpu_v7_spectre_init(void) case ARM_CPU_PART_CORTEX_A57: case ARM_CPU_PART_CORTEX_A72: { struct arm_smccc_res res; + int conduit; if (psci_ops.smccc_version == SMCCC_VERSION_1_0) break; - switch (psci_ops.conduit) { - case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 != 0) - break; + conduit = arm_smccc_1_1_call(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, + ARM_SMCCC_ARCH_WORKAROUND_1, &res); + + if ((int)res.a0 == 0) { if (processor.switch_mm != cpu_v7_hvc_switch_mm && cpu) goto bl_error; - per_cpu(harden_branch_predictor_fn, cpu) = - call_hvc_arch_workaround_1; - processor.switch_mm = cpu_v7_hvc_switch_mm; - spectre_v2_method = "hypervisor"; - break; - - case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 != 0) + switch (conduit) { + case PSCI_CONDUIT_HVC: + per_cpu(harden_branch_predictor_fn, cpu) = + call_hvc_arch_workaround_1; + processor.switch_mm = cpu_v7_hvc_switch_mm; + spectre_v2_method = "hypervisor"; break; - if (processor.switch_mm != cpu_v7_smc_switch_mm && cpu) - goto bl_error; - per_cpu(harden_branch_predictor_fn, cpu) = - call_smc_arch_workaround_1; - processor.switch_mm = cpu_v7_smc_switch_mm; - spectre_v2_method = "firmware"; - break; - - default: - break; + case PSCI_CONDUIT_SMC: + per_cpu(harden_branch_predictor_fn, cpu) = + call_smc_arch_workaround_1; + processor.switch_mm = cpu_v7_smc_switch_mm; + spectre_v2_method = "firmware"; + break; + default: + break; + } } } #endif diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index a509e35132d2..fee09ee52ec8 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -234,12 +234,14 @@ enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry) if (psci_ops.smccc_version == SMCCC_VERSION_1_0) return; + arm_smccc_1_1_call(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, + ARM_SMCCC_ARCH_WORKAROUND_1, &res); + + if ((int)res.a0 < 0) + return; + switch (psci_ops.conduit) { case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 < 0) - return; cb = call_hvc_arch_workaround_1; /* This is a guest, no need to patch KVM vectors */ smccc_start = NULL; @@ -247,10 +249,6 @@ enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry) break; case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 < 0) - return; cb = call_smc_arch_workaround_1; smccc_start = __smccc_workaround_1_smc_start; smccc_end = __smccc_workaround_1_smc_end; @@ -343,6 +341,8 @@ void __init arm64_enable_wa2_handling(struct alt_instr *alt, void arm64_set_ssbd_mitigation(bool state) { + int conduit; + if (this_cpu_has_cap(ARM64_SSBS)) { if (state) asm volatile(SET_PSTATE_SSBS(0)); @@ -351,19 +351,9 @@ void arm64_set_ssbd_mitigation(bool state) return; } - switch (psci_ops.conduit) { - case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); - break; - - case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); - break; + conduit = arm_smccc_1_1_call(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); - default: - WARN_ON_ONCE(1); - break; - } + WARN_ON_ONCE(conduit == PSCI_CONDUIT_NONE); } static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry, @@ -385,21 +375,8 @@ static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry, return false; } - switch (psci_ops.conduit) { - case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_2, &res); - break; - - case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_2, &res); - break; - - default: - ssbd_state = ARM64_SSBD_UNKNOWN; - return false; - } + arm_smccc_1_1_call(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, + ARM_SMCCC_ARCH_WORKAROUND_2, &res); val = (s32)res.a0; -- 2.19.2
WARNING: multiple messages have this Message-ID (diff)
From: Steven Price <steven.price@arm.com> To: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com>, Marc Zyngier <marc.zyngier@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Christoffer Dall <christoffer.dall@arm.com>, Steven Price <steven.price@arm.com> Subject: [RFC PATCH v2 04/12] arm/arm64: Make use of the SMCCC 1.1 wrapper Date: Wed, 12 Dec 2018 15:02:18 +0000 [thread overview] Message-ID: <20181212150226.38051-5-steven.price@arm.com> (raw) In-Reply-To: <20181212150226.38051-1-steven.price@arm.com> Rather than directly choosing which function to use based on psci_ops.conduit, use the new arm_smccc_1_1 wrapper instead. In some cases we still need to do some operations based on the conduit, but the code duplication is removed. Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm/mm/proc-v7-bugs.c | 46 +++++++++++++++------------------ arch/arm64/kernel/cpu_errata.c | 47 +++++++++------------------------- 2 files changed, 32 insertions(+), 61 deletions(-) diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c index 5544b82a2e7a..a9c7474d3e39 100644 --- a/arch/arm/mm/proc-v7-bugs.c +++ b/arch/arm/mm/proc-v7-bugs.c @@ -78,39 +78,33 @@ static void cpu_v7_spectre_init(void) case ARM_CPU_PART_CORTEX_A57: case ARM_CPU_PART_CORTEX_A72: { struct arm_smccc_res res; + int conduit; if (psci_ops.smccc_version == SMCCC_VERSION_1_0) break; - switch (psci_ops.conduit) { - case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 != 0) - break; + conduit = arm_smccc_1_1_call(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, + ARM_SMCCC_ARCH_WORKAROUND_1, &res); + + if ((int)res.a0 == 0) { if (processor.switch_mm != cpu_v7_hvc_switch_mm && cpu) goto bl_error; - per_cpu(harden_branch_predictor_fn, cpu) = - call_hvc_arch_workaround_1; - processor.switch_mm = cpu_v7_hvc_switch_mm; - spectre_v2_method = "hypervisor"; - break; - - case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 != 0) + switch (conduit) { + case PSCI_CONDUIT_HVC: + per_cpu(harden_branch_predictor_fn, cpu) = + call_hvc_arch_workaround_1; + processor.switch_mm = cpu_v7_hvc_switch_mm; + spectre_v2_method = "hypervisor"; break; - if (processor.switch_mm != cpu_v7_smc_switch_mm && cpu) - goto bl_error; - per_cpu(harden_branch_predictor_fn, cpu) = - call_smc_arch_workaround_1; - processor.switch_mm = cpu_v7_smc_switch_mm; - spectre_v2_method = "firmware"; - break; - - default: - break; + case PSCI_CONDUIT_SMC: + per_cpu(harden_branch_predictor_fn, cpu) = + call_smc_arch_workaround_1; + processor.switch_mm = cpu_v7_smc_switch_mm; + spectre_v2_method = "firmware"; + break; + default: + break; + } } } #endif diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index a509e35132d2..fee09ee52ec8 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -234,12 +234,14 @@ enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry) if (psci_ops.smccc_version == SMCCC_VERSION_1_0) return; + arm_smccc_1_1_call(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, + ARM_SMCCC_ARCH_WORKAROUND_1, &res); + + if ((int)res.a0 < 0) + return; + switch (psci_ops.conduit) { case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 < 0) - return; cb = call_hvc_arch_workaround_1; /* This is a guest, no need to patch KVM vectors */ smccc_start = NULL; @@ -247,10 +249,6 @@ enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry) break; case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_1, &res); - if ((int)res.a0 < 0) - return; cb = call_smc_arch_workaround_1; smccc_start = __smccc_workaround_1_smc_start; smccc_end = __smccc_workaround_1_smc_end; @@ -343,6 +341,8 @@ void __init arm64_enable_wa2_handling(struct alt_instr *alt, void arm64_set_ssbd_mitigation(bool state) { + int conduit; + if (this_cpu_has_cap(ARM64_SSBS)) { if (state) asm volatile(SET_PSTATE_SSBS(0)); @@ -351,19 +351,9 @@ void arm64_set_ssbd_mitigation(bool state) return; } - switch (psci_ops.conduit) { - case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); - break; - - case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); - break; + conduit = arm_smccc_1_1_call(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL); - default: - WARN_ON_ONCE(1); - break; - } + WARN_ON_ONCE(conduit == PSCI_CONDUIT_NONE); } static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry, @@ -385,21 +375,8 @@ static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry, return false; } - switch (psci_ops.conduit) { - case PSCI_CONDUIT_HVC: - arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_2, &res); - break; - - case PSCI_CONDUIT_SMC: - arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, - ARM_SMCCC_ARCH_WORKAROUND_2, &res); - break; - - default: - ssbd_state = ARM64_SSBD_UNKNOWN; - return false; - } + arm_smccc_1_1_call(ARM_SMCCC_ARCH_FEATURES_FUNC_ID, + ARM_SMCCC_ARCH_WORKAROUND_2, &res); val = (s32)res.a0; -- 2.19.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2018-12-12 15:03 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-12-12 15:02 [RFC PATCH v2 00/12] arm64: Paravirtualized time support Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 01/12] KVM: arm64: Document PV-time interface Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 02/12] KVM: arm/arm64: Factor out hypercall handling from PSCI code Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 03/12] arm/arm64: Provide a wrapper for SMCCC 1.1 calls Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` Steven Price [this message] 2018-12-12 15:02 ` [RFC PATCH v2 04/12] arm/arm64: Make use of the SMCCC 1.1 wrapper Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 05/12] KVM: arm64: Implement PV_FEATURES call Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 06/12] KVM: arm64: Support stolen time reporting via shared structure Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 07/12] arm64: Retrieve stolen time as paravirtualized guest Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 08/12] KVM: Allow kvm_device_ops to be const Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 09/12] KVM: arm64: Provide a PV_TIME device to user space Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 10/12] KVM: arm64: Support Live Physical Time reporting Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 11/12] clocksource: arm_arch_timer: Use paravirtualized LPT Steven Price 2018-12-12 15:02 ` Steven Price 2018-12-12 15:02 ` [RFC PATCH v2 12/12] KVM: arm64: Export LPT using PV_TIME device Steven Price 2018-12-12 15:02 ` Steven Price
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