[PATCH v5 6/9] KVM: MMU: introduce pte_prefetch_topup_memory_cache()

[Xiao Guangrong]

Introduce this function to topup prefetch cache

Signed-off-by: Xiao Guangrong <xiaoguangr...@cn.fujitsu.com>
---
 arch/x86/kvm/mmu.c |   25 +++++++++++++++++++++----
 1 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 3dcd55d..cda4587 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -89,6 +89,8 @@ module_param(oos_shadow, bool, 0644);
        }
 #endif
 
+#define PTE_PREFETCH_NUM               16
+
 #define PT_FIRST_AVAIL_BITS_SHIFT 9
 #define PT64_SECOND_AVAIL_BITS_SHIFT 52
 
@@ -316,15 +318,16 @@ static void update_spte(u64 *sptep, u64 new_spte)
        }
 }
 
-static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
-                                 struct kmem_cache *base_cache, int min)
+static int __mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
+                                   struct kmem_cache *base_cache, int min,
+                                   int max, gfp_t flags)
 {
        void *obj;
 
        if (cache->nobjs >= min)
                return 0;
-       while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
-               obj = kmem_cache_zalloc(base_cache, GFP_KERNEL);
+       while (cache->nobjs < max) {
+               obj = kmem_cache_zalloc(base_cache, flags);
                if (!obj)
                        return -ENOMEM;
                cache->objects[cache->nobjs++] = obj;
@@ -332,6 +335,20 @@ static int mmu_topup_memory_cache(struct 
kvm_mmu_memory_cache *cache,
        return 0;
 }
 
+static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
+                                 struct kmem_cache *base_cache, int min)
+{
+       return __mmu_topup_memory_cache(cache, base_cache, min,
+                                     ARRAY_SIZE(cache->objects), GFP_KERNEL);
+}
+
+static int pte_prefetch_topup_memory_cache(struct kvm_vcpu *vcpu)
+{
+       return __mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache,
+                                       rmap_desc_cache, PTE_PREFETCH_NUM,
+                                       PTE_PREFETCH_NUM, GFP_ATOMIC);
+}
+
 static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc,
                                  struct kmem_cache *cache)
 {
-- 
1.6.1.2


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