[PATCH v5 1/3] arm64: Rename WORKAROUND_1165522 to SPECULATIVE_AT_VHE

Steven Price
2019-12-16T11:56:48Z

Cortex-A55 is affected by a similar erratum, so rename the existing
workaround for errarum 1165522 so it can be used for both errata.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/arm64/Kconfig | 4 ++++
arch/arm64/include/asm/cpucaps.h | 2 +-
arch/arm64/include/asm/kvm_host.h | 2 +-
arch/arm64/include/asm/kvm_hyp.h | 2 +-
arch/arm64/kernel/cpu_errata.c | 17 +++++++++++++----
arch/arm64/kvm/hyp/switch.c | 2 +-
arch/arm64/kvm/hyp/tlb.c | 4 ++--
7 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b1b4476ddb83..b2f0df19e7f4 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -514,9 +514,13 @@ config ARM64_ERRATUM_1418040

If unsure, say Y.

+config ARM64_WORKAROUND_SPECULATIVE_AT_VHE
+ 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"
default y
+ select ARM64_WORKAROUND_SPECULATIVE_AT_VHE
help
This option adds a workaround for ARM Cortex-A76 erratum 1165522.

diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
index b92683871119..327a38a5162f 100644
--- a/arch/arm64/include/asm/cpucaps.h
+++ b/arch/arm64/include/asm/cpucaps.h
@@ -44,7 +44,7 @@
#define ARM64_SSBS 34
#define ARM64_WORKAROUND_1418040 35
#define ARM64_HAS_SB 36
-#define ARM64_WORKAROUND_1165522 37
+#define ARM64_WORKAROUND_SPECULATIVE_AT_VHE 37
#define ARM64_HAS_ADDRESS_AUTH_ARCH 38
#define ARM64_HAS_ADDRESS_AUTH_IMP_DEF 39
#define ARM64_HAS_GENERIC_AUTH_ARCH 40
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index c61260cf63c5..2a5f58857d12 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -571,7 +571,7 @@ static inline bool kvm_arch_requires_vhe(void)
return true;

/* Some implementations have defects that confine them to VHE */
- if (cpus_have_cap(ARM64_WORKAROUND_1165522))
+ if (cpus_have_cap(ARM64_WORKAROUND_SPECULATIVE_AT_VHE))
return true;

return false;
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 97f21cc66657..167a161dd596 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -95,7 +95,7 @@ static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
* before we can switch to the EL1/EL0 translation regime used by
* the guest.
*/
- asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_1165522));
+ asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT_VHE));
}

#endif /* __ARM64_KVM_HYP_H__ */
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 6a09ca7644ea..85bd8aff78f9 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -756,6 +756,16 @@ 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_ERRATUM_1165522
+ /* Cortex A76 r0p0 to r2p0 */
+ MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0),
+#endif
+ {},
+};
+#endif
+
const struct arm64_cpu_capabilities arm64_errata[] = {
#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
{
@@ -882,12 +892,11 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
ERRATA_MIDR_RANGE_LIST(erratum_1418040_list),
},
#endif
-#ifdef CONFIG_ARM64_ERRATUM_1165522
+#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT_VHE
{
- /* Cortex-A76 r0p0 to r2p0 */
.desc = "ARM erratum 1165522",
- .capability = ARM64_WORKAROUND_1165522,
- ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0),
+ .capability = ARM64_WORKAROUND_SPECULATIVE_AT_VHE,
+ ERRATA_MIDR_RANGE_LIST(erratum_speculative_at_vhe_list),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_1463225
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 72fbbd86eb5e..eefcaa6d839f 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -162,7 +162,7 @@ static void deactivate_traps_vhe(void)
* before we can switch to the EL2/EL0 translation regime used by
* the host.
*/
- asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_1165522));
+ asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT_VHE));

write_sysreg(CPACR_EL1_DEFAULT, cpacr_el1);
write_sysreg(vectors, vbar_el1);
diff --git a/arch/arm64/kvm/hyp/tlb.c b/arch/arm64/kvm/hyp/tlb.c
index c2bc17ca6430..c827f3e0ba8f 100644
--- a/arch/arm64/kvm/hyp/tlb.c
+++ b/arch/arm64/kvm/hyp/tlb.c
@@ -23,7 +23,7 @@ static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm,

local_irq_save(cxt->flags);

- if (cpus_have_const_cap(ARM64_WORKAROUND_1165522)) {
+ if (cpus_have_const_cap(ARM64_WORKAROUND_SPECULATIVE_AT_VHE)) {
/*
* For CPUs that are affected by ARM erratum 1165522, we
* cannot trust stage-1 to be in a correct state at that
@@ -103,7 +103,7 @@ static void __hyp_text __tlb_switch_to_host_vhe(struct kvm *kvm,
write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2);
isb();

- if (cpus_have_const_cap(ARM64_WORKAROUND_1165522)) {
+ if (cpus_have_const_cap(ARM64_WORKAROUND_SPECULATIVE_AT_VHE)) {
/* Restore the registers to what they were */
write_sysreg_el1(cxt->tcr, SYS_TCR);
write_sysreg_el1(cxt->sctlr, SYS_SCTLR);
--
2.20.1