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Message-Id: <20180215151710.395822109@linuxfoundation.org>
Date: Thu, 15 Feb 2018 16:16:25 +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, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Marc Zyngier <marc.zyngier@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>
Subject: [PATCH 4.14 094/195] [Variant 2/Spectre-v2] arm64: Kill PSCI_GET_VERSION as a variant-2 workaround
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marc Zyngier <marc.zyngier@....com>
Commit 3a0a397ff5ff upstream.
Now that we've standardised on SMCCC v1.1 to perform the branch
prediction invalidation, let's drop the previous band-aid.
If vendors haven't updated their firmware to do SMCCC 1.1, they
haven't updated PSCI either, so we don't loose anything.
Tested-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/arm64/kernel/bpi.S | 24 ---------------------
arch/arm64/kernel/cpu_errata.c | 45 +++++++++++------------------------------
arch/arm64/kvm/hyp/switch.c | 14 ------------
3 files changed, 13 insertions(+), 70 deletions(-)
--- a/arch/arm64/kernel/bpi.S
+++ b/arch/arm64/kernel/bpi.S
@@ -54,30 +54,6 @@ ENTRY(__bp_harden_hyp_vecs_start)
vectors __kvm_hyp_vector
.endr
ENTRY(__bp_harden_hyp_vecs_end)
-ENTRY(__psci_hyp_bp_inval_start)
- sub sp, sp, #(8 * 18)
- stp x16, x17, [sp, #(16 * 0)]
- stp x14, x15, [sp, #(16 * 1)]
- stp x12, x13, [sp, #(16 * 2)]
- stp x10, x11, [sp, #(16 * 3)]
- stp x8, x9, [sp, #(16 * 4)]
- stp x6, x7, [sp, #(16 * 5)]
- stp x4, x5, [sp, #(16 * 6)]
- stp x2, x3, [sp, #(16 * 7)]
- stp x0, x1, [sp, #(16 * 8)]
- mov x0, #0x84000000
- smc #0
- ldp x16, x17, [sp, #(16 * 0)]
- ldp x14, x15, [sp, #(16 * 1)]
- ldp x12, x13, [sp, #(16 * 2)]
- ldp x10, x11, [sp, #(16 * 3)]
- ldp x8, x9, [sp, #(16 * 4)]
- ldp x6, x7, [sp, #(16 * 5)]
- ldp x4, x5, [sp, #(16 * 6)]
- ldp x2, x3, [sp, #(16 * 7)]
- ldp x0, x1, [sp, #(16 * 8)]
- add sp, sp, #(8 * 18)
-ENTRY(__psci_hyp_bp_inval_end)
ENTRY(__qcom_hyp_sanitize_link_stack_start)
stp x29, x30, [sp, #-16]!
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -67,7 +67,6 @@ static int cpu_enable_trap_ctr_access(vo
DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
#ifdef CONFIG_KVM
-extern char __psci_hyp_bp_inval_start[], __psci_hyp_bp_inval_end[];
extern char __qcom_hyp_sanitize_link_stack_start[];
extern char __qcom_hyp_sanitize_link_stack_end[];
extern char __smccc_workaround_1_smc_start[];
@@ -116,8 +115,6 @@ static void __install_bp_hardening_cb(bp
spin_unlock(&bp_lock);
}
#else
-#define __psci_hyp_bp_inval_start NULL
-#define __psci_hyp_bp_inval_end NULL
#define __qcom_hyp_sanitize_link_stack_start NULL
#define __qcom_hyp_sanitize_link_stack_end NULL
#define __smccc_workaround_1_smc_start NULL
@@ -164,24 +161,25 @@ static void call_hvc_arch_workaround_1(v
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
}
-static bool check_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry)
+static int enable_smccc_arch_workaround_1(void *data)
{
+ const struct arm64_cpu_capabilities *entry = data;
bp_hardening_cb_t cb;
void *smccc_start, *smccc_end;
struct arm_smccc_res res;
if (!entry->matches(entry, SCOPE_LOCAL_CPU))
- return false;
+ return 0;
if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
- return false;
+ return 0;
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 (res.a0)
- return false;
+ return 0;
cb = call_hvc_arch_workaround_1;
smccc_start = __smccc_workaround_1_hvc_start;
smccc_end = __smccc_workaround_1_hvc_end;
@@ -191,35 +189,18 @@ static bool check_smccc_arch_workaround_
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
if (res.a0)
- return false;
+ return 0;
cb = call_smc_arch_workaround_1;
smccc_start = __smccc_workaround_1_smc_start;
smccc_end = __smccc_workaround_1_smc_end;
break;
default:
- return false;
+ return 0;
}
install_bp_hardening_cb(entry, cb, smccc_start, smccc_end);
- return true;
-}
-
-static int enable_psci_bp_hardening(void *data)
-{
- const struct arm64_cpu_capabilities *entry = data;
-
- if (psci_ops.get_version) {
- if (check_smccc_arch_workaround_1(entry))
- return 0;
-
- install_bp_hardening_cb(entry,
- (bp_hardening_cb_t)psci_ops.get_version,
- __psci_hyp_bp_inval_start,
- __psci_hyp_bp_inval_end);
- }
-
return 0;
}
@@ -399,22 +380,22 @@ const struct arm64_cpu_capabilities arm6
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
- .enable = enable_psci_bp_hardening,
+ .enable = enable_smccc_arch_workaround_1,
},
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
- .enable = enable_psci_bp_hardening,
+ .enable = enable_smccc_arch_workaround_1,
},
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
- .enable = enable_psci_bp_hardening,
+ .enable = enable_smccc_arch_workaround_1,
},
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
MIDR_ALL_VERSIONS(MIDR_CORTEX_A75),
- .enable = enable_psci_bp_hardening,
+ .enable = enable_smccc_arch_workaround_1,
},
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
@@ -428,12 +409,12 @@ const struct arm64_cpu_capabilities arm6
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
- .enable = enable_psci_bp_hardening,
+ .enable = enable_smccc_arch_workaround_1,
},
{
.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
- .enable = enable_psci_bp_hardening,
+ .enable = enable_smccc_arch_workaround_1,
},
#endif
{
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -325,20 +325,6 @@ again:
if (exit_code == ARM_EXCEPTION_TRAP && !__populate_fault_info(vcpu))
goto again;
- if (exit_code == ARM_EXCEPTION_TRAP &&
- (kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC64 ||
- kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC32)) {
- u32 val = vcpu_get_reg(vcpu, 0);
-
- if (val == PSCI_0_2_FN_PSCI_VERSION) {
- val = kvm_psci_version(vcpu, kern_hyp_va(vcpu->kvm));
- if (unlikely(val == KVM_ARM_PSCI_0_1))
- val = PSCI_RET_NOT_SUPPORTED;
- vcpu_set_reg(vcpu, 0, val);
- goto again;
- }
- }
-
if (static_branch_unlikely(&vgic_v2_cpuif_trap) &&
exit_code == ARM_EXCEPTION_TRAP) {
bool valid;
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