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KVM: arm64: Tidy up kvm_map_vector()

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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.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20201113113847.21619-3-will@kernel.org
This commit is contained in:
Will Deacon 2020-11-13 11:38:39 +00:00 committed by Marc Zyngier
parent 8934c84540
commit de5bcdb484
1 changed files with 14 additions and 14 deletions
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28
arch/arm64/kvm/arm.c
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@ -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)