KVM: x86: return 0 in case kvm_mmu_memory_cache has min number of objects

The code tries to pre-allocate *min* number of objects, so it is ok to
return 0 when the kvm_mmu_memory_cache meets the requirement.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 51b953a..b383e84 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -932,7 +932,7 @@ static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
        while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
                obj = kmem_cache_zalloc(base_cache, GFP_KERNEL);
                if (!obj)
-                       return -ENOMEM;
+                       return cache->nobjs >= min ? 0 : -ENOMEM;
                cache->objects[cache->nobjs++] = obj;
        }
        return 0;
@@ -960,7 +960,7 @@ static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache,
        while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
                page = (void *)__get_free_page(GFP_KERNEL_ACCOUNT);
                if (!page)
-                       return -ENOMEM;
+                       return cache->nobjs >= min ? 0 : -ENOMEM;
                cache->objects[cache->nobjs++] = page;
        }
        return 0;