[PATCH 4/4] KVM: arm64: nv: Move TLBI VMALLS12E1* emulation over to kvm_stage2_unmap_all()

[Marc Zyngier]

Instead of emulating TLBI VMALLS12E1* with a range invalidation, use
kvm_stage2_unmap_all() which is more efficient, specially in deeply
nested cases.

Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 arch/arm64/kvm/sys_regs.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 44aae52c473d7..2c90e185c6e8e 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -4124,26 +4124,24 @@ static void s2_mmu_unmap_range(struct kvm_s2_mmu *mmu,
 	kvm_stage2_unmap_range(mmu, info->range.start, info->range.size, true);
 }
 
+static void s2_mmu_unmap_all(struct kvm_s2_mmu *mmu,
+			     const union tlbi_info *info)
+{
+	kvm_stage2_unmap_all(mmu, true);
+}
+
 static bool handle_vmalls12e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 				const struct sys_reg_desc *r)
 {
 	u32 sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2);
-	u64 limit, vttbr;
+	u64 vttbr;
 
 	if (!kvm_supported_tlbi_s12_op(vcpu, sys_encoding))
 		return undef_access(vcpu, p, r);
 
 	vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2);
-	limit = BIT_ULL(kvm_get_pa_bits(vcpu->kvm));
 
-	kvm_s2_mmu_iterate_by_vmid(vcpu->kvm, get_vmid(vttbr),
-				   &(union tlbi_info) {
-					   .range = {
-						   .start = 0,
-						   .size = limit,
-					   },
-				   },
-				   s2_mmu_unmap_range);
+	kvm_s2_mmu_iterate_by_vmid(vcpu->kvm, get_vmid(vttbr), NULL, s2_mmu_unmap_all);
 
 	return true;
 }
-- 
2.47.3