ARM: KVM: change kvm_tlb_flush_vmid to kvm_tlb_flush_vmid_ipa

v8 is capable of invalidating Stage-2 by IPA, but v7 is not.
Change kvm_tlb_flush_vmid() to take an IPA parameter, which is
then ignored by the invalidation code (and nuke the whole TLB
as it always did).

This allows v8 to implement a more optimized strategy.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

2 files changed, 10 insertions, 7 deletions

diff --git a/arch/arm/kvm/interrupts.S b/arch/arm/kvm/interrupts.S
index a8e0c2d85cb5..f7793df62f58 100644
--- a/arch/arm/kvm/interrupts.S
+++ b/arch/arm/kvm/interrupts.S
@@ -35,15 +35,18 @@ __kvm_hyp_code_start:
 /********************************************************************
  * Flush per-VMID TLBs
  *
- * void __kvm_tlb_flush_vmid(struct kvm *kvm);
+ * void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
  *
  * We rely on the hardware to broadcast the TLB invalidation to all CPUs
  * inside the inner-shareable domain (which is the case for all v7
  * implementations).  If we come across a non-IS SMP implementation, we'll
  * have to use an IPI based mechanism. Until then, we stick to the simple
  * hardware assisted version.
+ *
+ * As v7 does not support flushing per IPA, just nuke the whole TLB
+ * instead, ignoring the ipa value.
  */
-ENTRY(__kvm_tlb_flush_vmid)
+ENTRY(__kvm_tlb_flush_vmid_ipa)
         push    {r2, r3}
 
         add     r0, r0, #KVM_VTTBR
@@ -60,7 +63,7 @@ ENTRY(__kvm_tlb_flush_vmid)
 
         pop     {r2, r3}
         bx      lr
-ENDPROC(__kvm_tlb_flush_vmid)
+ENDPROC(__kvm_tlb_flush_vmid_ipa)
 
 /********************************************************************
  * Flush TLBs and instruction caches of all CPUs inside the inner-shareable
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 692f064fde0a..0bf2c8551f75 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -34,9 +34,9 @@ extern char  __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 
 static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
 
-static void kvm_tlb_flush_vmid(struct kvm *kvm)
+static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
 {
-        kvm_call_hyp(__kvm_tlb_flush_vmid, kvm);
+        kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
 }
 
 static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
@@ -449,7 +449,7 @@ static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
         old_pte = *pte;
         kvm_set_pte(pte, *new_pte);
         if (pte_present(old_pte))
-                kvm_tlb_flush_vmid(kvm);
+                kvm_tlb_flush_vmid_ipa(kvm, addr);
         else
                 get_page(virt_to_page(pte));
 
@@ -666,7 +666,7 @@ static void handle_hva_to_gpa(struct kvm *kvm,
 static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data)
 {
         unmap_stage2_range(kvm, gpa, PAGE_SIZE);
-        kvm_tlb_flush_vmid(kvm);
+        kvm_tlb_flush_vmid_ipa(kvm, gpa);
 }
 
 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)