The bulk of the work in kvm_map_vector() is conditional on the
ARM64_HARDEN_EL2_VECTORS capability, so return early if that is not set
and make the code a bit easier to read.
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Quentin Perret <qperret@xxxxxxxxxx>
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
---
arch/arm64/kvm/arm.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index b43b637ded14..476bc613d0e6 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1297,6 +1297,8 @@ static unsigned long nvhe_percpu_order(void)
static int kvm_map_vectors(void)
{
+ int slot;
+
/*
* SV2 = ARM64_SPECTRE_V2
* HEL2 = ARM64_HARDEN_EL2_VECTORS
@@ -1306,22 +1308,20 @@ static int kvm_map_vectors(void)
* !SV2 + HEL2 -> allocate one vector slot and use exec mapping
* SV2 + HEL2 -> use hardened vectors and use exec mapping
*/
- if (cpus_have_const_cap(ARM64_HARDEN_EL2_VECTORS)) {
- phys_addr_t vect_pa = __pa_symbol(__bp_harden_hyp_vecs);
- unsigned long size = __BP_HARDEN_HYP_VECS_SZ;
+ if (!cpus_have_const_cap(ARM64_HARDEN_EL2_VECTORS))
+ return 0;
- /*
- * Always allocate a spare vector slot, as we don't
- * know yet which CPUs have a BP hardening slot that
- * we can reuse.
- */
- __kvm_harden_el2_vector_slot = atomic_inc_return(&arm64_el2_vector_last_slot);
- BUG_ON(__kvm_harden_el2_vector_slot >= BP_HARDEN_EL2_SLOTS);
- return create_hyp_exec_mappings(vect_pa, size,
- &__kvm_bp_vect_base);
- }
+ /*
+ * Always allocate a spare vector slot, as we don't know yet which CPUs
+ * have a BP hardening slot that we can reuse.
+ */
+ slot = atomic_inc_return(&arm64_el2_vector_last_slot);
+ BUG_ON(slot >= BP_HARDEN_EL2_SLOTS);
+ __kvm_harden_el2_vector_slot = slot;
- return 0;
+ return create_hyp_exec_mappings(__pa_symbol(__bp_harden_hyp_vecs),
+ __BP_HARDEN_HYP_VECS_SZ,
+ &__kvm_bp_vect_base);
}
static void cpu_init_hyp_mode(void)
--
2.29.2.299.gdc1121823c-goog
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