4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mark Rutland <mark.rutland@xxxxxxx>
From: Marc Zyngier <marc.zyngier@xxxxxxx>
commit 6840bdd73d07216ab4bc46f5a8768c37ea519038 upstream.
Now that we have per-CPU vectors, let's plug then in the KVM/arm64 code.
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
[v4.9: account for files moved to virt/ upstream, use cpus_have_cap()]
Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx> [v4.9 backport]
Tested-by: Greg Hackmann <ghackmann@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/include/asm/kvm_mmu.h | 10 ++++++++++
arch/arm/kvm/arm.c | 9 ++++++++-
arch/arm64/include/asm/kvm_mmu.h | 38 ++++++++++++++++++++++++++++++++++++++
arch/arm64/kvm/hyp/switch.c | 2 +-
4 files changed, 57 insertions(+), 2 deletions(-)
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -223,6 +223,16 @@ static inline unsigned int kvm_get_vmid_
return 8;
}
+static inline void *kvm_get_hyp_vector(void)
+{
+ return kvm_ksym_ref(__kvm_hyp_vector);
+}
+
+static inline int kvm_map_vectors(void)
+{
+ return 0;
+}
+
#endif /* !__ASSEMBLY__ */
#endif /* __ARM_KVM_MMU_H__ */
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -1088,7 +1088,7 @@ static void cpu_init_hyp_mode(void *dumm
pgd_ptr = kvm_mmu_get_httbr();
stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
hyp_stack_ptr = stack_page + PAGE_SIZE;
- vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
+ vector_ptr = (unsigned long)kvm_get_hyp_vector();
__cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
__cpu_init_stage2();
@@ -1345,6 +1345,13 @@ static int init_hyp_mode(void)
goto out_err;
}
+
+ err = kvm_map_vectors();
+ if (err) {
+ kvm_err("Cannot map vectors\n");
+ goto out_err;
+ }
+
/*
* Map the Hyp stack pages
*/
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -313,5 +313,43 @@ static inline unsigned int kvm_get_vmid_
return (cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR1_VMIDBITS_SHIFT) == 2) ? 16 : 8;
}
+#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
+#include <asm/mmu.h>
+
+static inline void *kvm_get_hyp_vector(void)
+{
+ struct bp_hardening_data *data = arm64_get_bp_hardening_data();
+ void *vect = kvm_ksym_ref(__kvm_hyp_vector);
+
+ if (data->fn) {
+ vect = __bp_harden_hyp_vecs_start +
+ data->hyp_vectors_slot * SZ_2K;
+
+ if (!cpus_have_cap(ARM64_HAS_VIRT_HOST_EXTN))
+ vect = lm_alias(vect);
+ }
+
+ return vect;
+}
+
+static inline int kvm_map_vectors(void)
+{
+ return create_hyp_mappings(kvm_ksym_ref(__bp_harden_hyp_vecs_start),
+ kvm_ksym_ref(__bp_harden_hyp_vecs_end),
+ PAGE_HYP_EXEC);
+}
+
+#else
+static inline void *kvm_get_hyp_vector(void)
+{
+ return kvm_ksym_ref(__kvm_hyp_vector);
+}
+
+static inline int kvm_map_vectors(void)
+{
+ return 0;
+}
+#endif
+
#endif /* __ASSEMBLY__ */
#endif /* __ARM64_KVM_MMU_H__ */
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -50,7 +50,7 @@ static void __hyp_text __activate_traps_
val &= ~CPACR_EL1_FPEN;
write_sysreg(val, cpacr_el1);
- write_sysreg(__kvm_hyp_vector, vbar_el1);
+ write_sysreg(kvm_get_hyp_vector(), vbar_el1);
}
static void __hyp_text __activate_traps_nvhe(void)