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arm64: Kill PSCI_GET_VERSION as a variant-2 workaround 

Commit 3a0a397ff5 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@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Marc Zyngier 2018-02-06 17:56:21 +00:00 committed by Greg Kroah-Hartman
parent dbca45b996
commit c584c903ba
3 changed files with 13 additions and 70 deletions
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24
arch/arm64/kernel/bpi.S
View File

@ -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]!

45
arch/arm64/kernel/cpu_errata.c
View File

@ -67,7 +67,6 @@ static int cpu_enable_trap_ctr_access(void *__unused)
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_hardening_cb_t fn,
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(void)
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_1(const struct arm64_cpu_capabilities *e
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 arm64_errata[] = {
{
.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 arm64_errata[] = {
{
.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
{

14
arch/arm64/kvm/hyp/switch.c
View File

@ -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;