[RFC][PATCH v2 11/21] kvm: allocate page table pages from DRAM

[Fengguang Wu <fengguang.wu@xxxxxxxxx>]

From: Yao Yuan <yuan.yao@xxxxxxxxx>

Signed-off-by: Yao Yuan <yuan.yao@xxxxxxxxx>
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---
arch/x86/kvm/mmu.c |   12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

--- linux.orig/arch/x86/kvm/mmu.c	2018-12-26 20:54:48.846720344 +0800
+++ linux/arch/x86/kvm/mmu.c	2018-12-26 20:54:48.842719614 +0800
@@ -950,6 +950,16 @@ static void mmu_free_memory_cache(struct
 		kmem_cache_free(cache, mc->objects[--mc->nobjs]);
 }
 
+static unsigned long __get_dram_free_pages(gfp_t gfp_mask)
+{
+       struct page *page;
+
+       page = __alloc_pages(GFP_KERNEL_ACCOUNT, 0, numa_node_id());
+       if (!page)
+	       return 0;
+       return (unsigned long) page_address(page);
+}
+
 static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache,
 				       int min)
 {
@@ -958,7 +968,7 @@ static int mmu_topup_memory_cache_page(s
 	if (cache->nobjs >= min)
 		return 0;
 	while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
-		page = (void *)__get_free_page(GFP_KERNEL_ACCOUNT);
+		page = (void *)__get_dram_free_pages(GFP_KERNEL_ACCOUNT);
 		if (!page)
 			return cache->nobjs >= min ? 0 : -ENOMEM;
 		cache->objects[cache->nobjs++] = page;