Subject: [PATCH 2/3] KVM: arm64: Simplify mmu_topup_memory_cache()

From: Will Deacon <[email-masked]>
Date: Thu, 23 Jul 2020 12:02:26 +0100

All callers of mmu_topup_memory_cache() pass the same min/max limits.
Simplify the code by just passing the 'struct kvm' instead.

Cc: Marc Zyngier <[email-masked]>
Cc: Quentin Perret <[email-masked]>
Signed-off-by: Will Deacon <[email-masked]>
---
 arch/arm64/kvm/mmu.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 9102373a9744..e55a28178164 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -124,20 +124,22 @@ static void stage2_dissolve_pud(struct kvm *kvm, phys_addr_t addr, pud_t *pudp)
 	put_page(virt_to_page(pudp));
 }
 
-static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
-				  int min, int max)
+static int mmu_topup_memory_cache(struct kvm *kvm,
+				  struct kvm_mmu_memory_cache *cache)
 {
 	void *page;
 
-	BUG_ON(max > KVM_NR_MEM_OBJS);
-	if (cache->nobjs >= min)
+	if (cache->nobjs >= kvm_mmu_cache_min_pages(kvm))
 		return 0;
-	while (cache->nobjs < max) {
+
+	while (cache->nobjs < KVM_NR_MEM_OBJS) {
 		page = (void *)__get_free_page(GFP_PGTABLE_USER);
 		if (!page)
 			return -ENOMEM;
+
 		cache->objects[cache->nobjs++] = page;
 	}
+
 	return 0;
 }
 
@@ -1480,9 +1482,7 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
 		if (writable)
 			pte = kvm_s2pte_mkwrite(pte);
 
-		ret = mmu_topup_memory_cache(&cache,
-					     kvm_mmu_cache_min_pages(kvm),
-					     KVM_NR_MEM_OBJS);
+		ret = mmu_topup_memory_cache(kvm, &cache);
 		if (ret)
 			break;
 		spin_lock(&kvm->mmu_lock);
@@ -1880,8 +1880,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	mmap_read_unlock(current->mm);
 
 	/* We need minimum second+third level pages */
-	ret = mmu_topup_memory_cache(memcache, kvm_mmu_cache_min_pages(kvm),
-				     KVM_NR_MEM_OBJS);
+	ret = mmu_topup_memory_cache(kvm, memcache);
 	if (ret)
 		return ret;
 
-- 
2.28.0.rc0.105.gf9edc3c819-goog

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