* [PATCH 1/2] arm64: Rename WORKAROUND_1165522 to SPECULATIVE_AT
2019-11-11 14:11 [PATCH 0/2] arm64: Workaround for Cortex-A55 erratum 1530923 Steven Price
@ 2019-11-11 14:11 ` Steven Price
2019-11-11 15:42 ` Marc Zyngier
2019-11-11 14:11 ` [PATCH 2/2] arm64: Workaround for Cortex-A55 erratum 1530923 Steven Price
1 sibling, 1 reply; 6+ messages in thread
From: Steven Price @ 2019-11-11 14:11 UTC (permalink / raw)
To: Catalin Marinas, Marc Zyngier, Will Deacon
Cc: kvmarm, linux-arm-kernel, linux-kernel, James Morse,
Julien Thierry, Suzuki K Poulose, Steven Price
Cortex-A55 is affected by a similar erratum, so rename the existing
workaround for errarum 1165522 so it can be used for both errata.
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 | 3 +--
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(+), 11 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 3f047afb982c..6cb4eff602c6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -510,9 +510,13 @@ config ARM64_ERRATUM_1418040
If unsure, say Y.
+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"
default y
+ select ARM64_WORKAROUND_SPECULATIVE_AT
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 ac1dbca3d0cd..33c9545fe08a 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 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 f656169db8c3..d9f35ef1675e 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -534,7 +534,7 @@ 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))
return true;
return false;
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 97f21cc66657..43d6c30b1bcc 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -95,8 +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)); }
#endif /* __ARM64_KVM_HYP_H__ */
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 93f34b4eca25..a9ea19fdaf03 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -772,6 +772,16 @@ static const struct arm64_cpu_capabilities erratum_843419_list[] = {
};
#endif
+#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
+ {},
+};
+#endif
+
const struct arm64_cpu_capabilities arm64_errata[] = {
#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
{
@@ -898,12 +908,11 @@ 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
{
- /* 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,
+ ERRATA_MIDR_RANGE_LIST(erratum_speculative_at_list),
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_1463225
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 799e84a40335..9b88627f9da9 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -148,7 +148,7 @@ 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));
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 eb0efc5557f3..97e4b21367f1 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)) {
/*
* For CPUs that are affected by ARM erratum 1165522, we
* cannot trust stage-1 to be in a correct state at that
@@ -87,7 +87,7 @@ 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)) {
/* Restore the registers to what they were */
write_sysreg_el1(cxt->tcr, SYS_TCR);
write_sysreg_el1(cxt->sctlr, SYS_SCTLR);
--
2.20.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 2/2] arm64: Workaround for Cortex-A55 erratum 1530923
2019-11-11 14:11 [PATCH 0/2] arm64: Workaround for Cortex-A55 erratum 1530923 Steven Price
2019-11-11 14:11 ` [PATCH 1/2] arm64: Rename WORKAROUND_1165522 to SPECULATIVE_AT Steven Price
@ 2019-11-11 14:11 ` Steven Price
1 sibling, 0 replies; 6+ messages in thread
From: Steven Price @ 2019-11-11 14:11 UTC (permalink / raw)
To: Catalin Marinas, Marc Zyngier, Will Deacon
Cc: kvmarm, linux-arm-kernel, linux-kernel, James Morse,
Julien Thierry, Suzuki K Poulose, Steven Price
Cortex-A55 erratum 1530923 allows TLB entries to be allocated as a
result of a speculative AT instruction. This may happen in the middle of
a guest world switch while the relevant VMSA configuration is in an
inconsistent state, leading to erroneous content being allocated into
TLBs.
The same workaround as is used for Cortex-A76 erratum 1165522
(WORKAROUND_SPECULATIVE_AT) can be used here. Note that this mandates
the use of VHE on affected parts.
Signed-off-by: Steven Price <steven.price@arm.com>
---
Documentation/arm64/silicon-errata.rst | 2 ++
arch/arm64/Kconfig | 13 +++++++++++++
arch/arm64/include/asm/kvm_hyp.h | 4 ++--
arch/arm64/kernel/cpu_errata.c | 6 +++++-
arch/arm64/kvm/hyp/switch.c | 4 ++--
arch/arm64/kvm/hyp/tlb.c | 4 ++--
6 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 5a09661330fc..3640441ac63b 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -84,6 +84,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | Cortex-A55 | #1530923 | ARM64_ERRATUM_1530923 |
++----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1349291 | N/A |
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6cb4eff602c6..98d1675ef3b8 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -526,6 +526,19 @@ 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"
+ default y
+ select ARM64_WORKAROUND_SPECULATIVE_AT
+ help
+ This option adds a workaround for ARM Cortex-A55 erratum 1530923.
+
+ Affected Cortex-A55 cores (r0p0, r0p1, r1p0, r2p0) could end-up with
+ corrupted TLBs by speculating an AT instruction during a guest
+ context switch.
+
+ If unsure, say Y.
+
config ARM64_ERRATUM_1286807
bool "Cortex-A76: Modification of the translation table for a virtual address might lead to read-after-read ordering violation"
default y
diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index 43d6c30b1bcc..a210c76f75b0 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -91,8 +91,8 @@ static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
/*
- * ARM erratum 1165522 requires the actual execution of the above
- * before we can switch to the EL1/EL0 translation regime used by
+ * ARM errata 1165522 and 1530923 require the actual execution of the
+ * above before we can switch to the EL1/EL0 translation regime used by
* the guest.
*/
asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT)); }
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index a9ea19fdaf03..7720eb71966e 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -777,6 +777,10 @@ 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_1530923
+ /* Cortex A55 r0p0 to r2p0 */
+ MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 2, 0),
#endif
{},
};
@@ -910,7 +914,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
#endif
#ifdef CONFIG_ARM64_WORKAROUND_SPECULATIVE_AT
{
- .desc = "ARM erratum 1165522",
+ .desc = "ARM errata 1165522, 1530923",
.capability = ARM64_WORKAROUND_SPECULATIVE_AT,
ERRATA_MIDR_RANGE_LIST(erratum_speculative_at_list),
},
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 9b88627f9da9..574cb0ac50a8 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -144,8 +144,8 @@ static void deactivate_traps_vhe(void)
write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2);
/*
- * ARM erratum 1165522 requires the actual execution of the above
- * before we can switch to the EL2/EL0 translation regime used by
+ * ARM errata 1165522 and 1530923 require the actual execution of the
+ * above before we can switch to the EL2/EL0 translation regime used by
* the host.
*/
asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT));
diff --git a/arch/arm64/kvm/hyp/tlb.c b/arch/arm64/kvm/hyp/tlb.c
index 97e4b21367f1..879dcb0053b3 100644
--- a/arch/arm64/kvm/hyp/tlb.c
+++ b/arch/arm64/kvm/hyp/tlb.c
@@ -25,8 +25,8 @@ static void __hyp_text __tlb_switch_to_guest_vhe(struct kvm *kvm,
if (cpus_have_const_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
/*
- * For CPUs that are affected by ARM erratum 1165522, we
- * cannot trust stage-1 to be in a correct state at that
+ * For CPUs that are affected by ARM errata 1165522 or 1530923,
+ * we cannot trust stage-1 to be in a correct state at that
* point. Since we do not want to force a full load of the
* vcpu state, we prevent the EL1 page-table walker to
* allocate new TLBs. This is done by setting the EPD bits
--
2.20.1
^ permalink raw reply related [flat|nested] 6+ messages in thread