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arm64: Unify WORKAROUND_SPECULATIVE_AT_{NVHE,VHE}

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Errata 1165522, 1319367 and 1530923 each allow TLB entries to be
allocated as a result of a speculative AT instruction. In order to
avoid mandating VHE on certain affected CPUs, apply the workaround to
both the nVHE and the VHE case for all affected CPUs.

Signed-off-by: Andrew Scull <ascull@google.com>
Acked-by: Will Deacon <will@kernel.org>
CC: Marc Zyngier <maz@kernel.org>
CC: James Morse <james.morse@arm.com>
CC: Suzuki K Poulose <suzuki.poulose@arm.com>
CC: Will Deacon <will@kernel.org>
CC: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20200504094858.108917-1-ascull@google.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Andrew Scull 2020-05-04 10:48:58 +01:00 committed by Will Deacon
parent 6a8b55ed40
commit 02ab1f5018
8 changed files with 51 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
arch/arm64/Kconfig
View File

@ -524,13 +524,13 @@ config ARM64_ERRATUM_1418040
If unsure, say Y.
config ARM64_WORKAROUND_SPECULATIVE_AT_VHE
config ARM64_WORKAROUND_SPECULATIVE_AT
bool
config ARM64_ERRATUM_1165522
bool "Cortex-A76: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
bool "Cortex-A76: 1165522: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
default y
select ARM64_WORKAROUND_SPECULATIVE_AT_VHE
select ARM64_WORKAROUND_SPECULATIVE_AT
help
This option adds a workaround for ARM Cortex-A76 erratum 1165522.
@ -540,10 +540,23 @@ config ARM64_ERRATUM_1165522
If unsure, say Y.
config ARM64_ERRATUM_1530923
bool "Cortex-A55: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
config ARM64_ERRATUM_1319367
bool "Cortex-A57/A72: 1319537: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
default y
select ARM64_WORKAROUND_SPECULATIVE_AT_VHE
select ARM64_WORKAROUND_SPECULATIVE_AT
help
This option adds work arounds for ARM Cortex-A57 erratum 1319537
and A72 erratum 1319367
Cortex-A57 and A72 cores could end-up with corrupted TLBs by
speculating an AT instruction during a guest context switch.
If unsure, say Y.
config ARM64_ERRATUM_1530923
bool "Cortex-A55: 1530923: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
default y
select ARM64_WORKAROUND_SPECULATIVE_AT
help
This option adds a workaround for ARM Cortex-A55 erratum 1530923.
@ -569,22 +582,6 @@ config ARM64_ERRATUM_1286807
invalidated has been observed by other observers. The
workaround repeats the TLBI+DSB operation.
config ARM64_WORKAROUND_SPECULATIVE_AT_NVHE
bool
config ARM64_ERRATUM_1319367
bool "Cortex-A57/A72: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
default y
select ARM64_WORKAROUND_SPECULATIVE_AT_NVHE
help
This option adds work arounds for ARM Cortex-A57 erratum 1319537
and A72 erratum 1319367
Cortex-A57 and A72 cores could end-up with corrupted TLBs by
speculating an AT instruction during a guest context switch.
If unsure, say Y.
config ARM64_ERRATUM_1463225
bool "Cortex-A76: Software Step might prevent interrupt recognition"
default y

15
arch/arm64/include/asm/cpucaps.h
View File

@ -44,7 +44,7 @@
#define ARM64_SSBS 34
#define ARM64_WORKAROUND_1418040 35
#define ARM64_HAS_SB 36
#define ARM64_WORKAROUND_SPECULATIVE_AT_VHE 37
#define ARM64_WORKAROUND_SPECULATIVE_AT 37
#define ARM64_HAS_ADDRESS_AUTH_ARCH 38
#define ARM64_HAS_ADDRESS_AUTH_IMP_DEF 39
#define ARM64_HAS_GENERIC_AUTH_ARCH 40
@ -55,13 +55,12 @@
#define ARM64_WORKAROUND_CAVIUM_TX2_219_TVM 45
#define ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM 46
#define ARM64_WORKAROUND_1542419 47
#define ARM64_WORKAROUND_SPECULATIVE_AT_NVHE 48
#define ARM64_HAS_E0PD 49
#define ARM64_HAS_RNG 50
#define ARM64_HAS_AMU_EXTN 51
#define ARM64_HAS_ADDRESS_AUTH 52
#define ARM64_HAS_GENERIC_AUTH 53
#define ARM64_HAS_E0PD 48
#define ARM64_HAS_RNG 49
#define ARM64_HAS_AMU_EXTN 50
#define ARM64_HAS_ADDRESS_AUTH 51
#define ARM64_HAS_GENERIC_AUTH 52
#define ARM64_NCAPS 54
#define ARM64_NCAPS 53
#endif /* __ASM_CPUCAPS_H */

4
arch/arm64/include/asm/kvm_host.h
View File

@ -573,10 +573,6 @@ static inline bool kvm_arch_requires_vhe(void)
if (system_supports_sve())
return true;
/* Some implementations have defects that confine them to VHE */
if (cpus_have_cap(ARM64_WORKAROUND_SPECULATIVE_AT_VHE))
return true;
return false;
}

2
arch/arm64/include/asm/kvm_hyp.h
View File

@ -102,7 +102,7 @@ static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
* above before we can switch to the EL1/EL0 translation regime used by
* the guest.
*/
asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT_VHE));
asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT));
}
#endif /* __ARM64_KVM_HYP_H__ */

25
arch/arm64/kernel/cpu_errata.c
View File

@ -635,7 +635,7 @@ has_neoverse_n1_erratum_1542419(const struct arm64_cpu_capabilities *entry,
return is_midr_in_range(midr, &range) && has_dic;
}
#if defined(CONFIG_HARDEN_EL2_VECTORS) || defined(CONFIG_ARM64_ERRATUM_1319367)
#if defined(CONFIG_HARDEN_EL2_VECTORS)
static const struct midr_range ca57_a72[] = {
MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
@ -757,12 +757,16 @@ static const struct arm64_cpu_capabilities erratum_843419_list[] = {
};
#endif
#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT_VHE
static const struct midr_range erratum_speculative_at_vhe_list[] = {
#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT
static const struct midr_range erratum_speculative_at_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_1319367
MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
#endif
#ifdef CONFIG_ARM64_ERRATUM_1530923
/* Cortex A55 r0p0 to r2p0 */
MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 2, 0),
@ -897,11 +901,11 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
ERRATA_MIDR_RANGE_LIST(erratum_1418040_list),
},
#endif
#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT_VHE
#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT
{
.desc = "ARM errata 1165522, 1530923",
.capability = ARM64_WORKAROUND_SPECULATIVE_AT_VHE,
ERRATA_MIDR_RANGE_LIST(erratum_speculative_at_vhe_list),
.desc = "ARM errata 1165522, 1319367, 1530923",
.capability = ARM64_WORKAROUND_SPECULATIVE_AT,
ERRATA_MIDR_RANGE_LIST(erratum_speculative_at_list),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_1463225
@ -934,13 +938,6 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
.matches = has_neoverse_n1_erratum_1542419,
.cpu_enable = cpu_enable_trap_ctr_access,
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_1319367
{
.desc = "ARM erratum 1319367",
.capability = ARM64_WORKAROUND_SPECULATIVE_AT_NVHE,
ERRATA_MIDR_RANGE_LIST(ca57_a72),
},
#endif
{
}

6
arch/arm64/kvm/hyp/switch.c
View File

@ -138,7 +138,7 @@ static void __hyp_text __activate_traps_nvhe(struct kvm_vcpu *vcpu)
write_sysreg(val, cptr_el2);
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_NVHE)) {
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
struct kvm_cpu_context *ctxt = &vcpu->arch.ctxt;
isb();
@ -181,7 +181,7 @@ static void deactivate_traps_vhe(void)
* above before we can switch to the EL2/EL0 translation regime used by
* the host.
*/
asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT_VHE));
asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT));
write_sysreg(CPACR_EL1_DEFAULT, cpacr_el1);
write_sysreg(vectors, vbar_el1);
@ -192,7 +192,7 @@ static void __hyp_text __deactivate_traps_nvhe(void)
{
u64 mdcr_el2 = read_sysreg(mdcr_el2);
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_NVHE)) {
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
u64 val;
/*

6
arch/arm64/kvm/hyp/sysreg-sr.c
View File

@ -118,7 +118,8 @@ static void __hyp_text __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
write_sysreg(ctxt->sys_regs[MPIDR_EL1], vmpidr_el2);
write_sysreg(ctxt->sys_regs[CSSELR_EL1], csselr_el1);
if (!cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_NVHE)) {
if (has_vhe() ||
!cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
write_sysreg_el1(ctxt->sys_regs[SCTLR_EL1], SYS_SCTLR);
write_sysreg_el1(ctxt->sys_regs[TCR_EL1], SYS_TCR);
} else if (!ctxt->__hyp_running_vcpu) {
@ -149,7 +150,8 @@ static void __hyp_text __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
write_sysreg(ctxt->sys_regs[PAR_EL1], par_el1);
write_sysreg(ctxt->sys_regs[TPIDR_EL1], tpidr_el1);
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_NVHE) &&
if (!has_vhe() &&
cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT) &&
ctxt->__hyp_running_vcpu) {
/*
* Must only be done for host registers, hence the context

11
arch/arm64/kvm/hyp/tlb.c
View File

@ -23,7 +23,7 @@ static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm,
local_irq_save(cxt->flags);
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_VHE)) {
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
/*
* For CPUs that are affected by ARM errata 1165522 or 1530923,
* we cannot trust stage-1 to be in a correct state at that
@ -63,7 +63,7 @@ static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm,
static void __hyp_text __tlb_switch_to_guest_nvhe(struct kvm *kvm,
struct tlb_inv_context *cxt)
{
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_NVHE)) {
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
u64 val;
/*
@ -79,8 +79,9 @@ static void __hyp_text __tlb_switch_to_guest_nvhe(struct kvm *kvm,
isb();
}
/* __load_guest_stage2() includes an ISB for the workaround. */
__load_guest_stage2(kvm);
isb();
asm(ALTERNATIVE("isb", "nop", ARM64_WORKAROUND_SPECULATIVE_AT));
}
static void __hyp_text __tlb_switch_to_guest(struct kvm *kvm,
@ -103,7 +104,7 @@ static void __hyp_text __tlb_switch_to_host_vhe(struct kvm *kvm,
write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2);
isb();
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_VHE)) {
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
/* Restore the registers to what they were */
write_sysreg_el1(cxt->tcr, SYS_TCR);
write_sysreg_el1(cxt->sctlr, SYS_SCTLR);
@ -117,7 +118,7 @@ static void __hyp_text __tlb_switch_to_host_nvhe(struct kvm *kvm,
{
write_sysreg(0, vttbr_el2);
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT_NVHE)) {
if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
/* Ensure write of the host VMID */
isb();
/* Restore the host's TCR_EL1 */