From: Fengguang Wu <fengguang.wu@intel.com>
Subject: [RFC][PATCH v2 11/21] kvm: allocate page table pages from DRAM
Date: Wed, 26 Dec 2018 21:14:57 +0800
Message-ID: <20181226133351.703380444@intel.com>
References: <20181226131446.330864849@intel.com>
Mime-Version: 1.0
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Cc: Linux Memory Management List <linux-mm@kvack.org>,
        Yao Yuan <yuan.yao@intel.com>,
        Fengguang Wu <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Return-path: <linux-kernel-owner@vger.kernel.org>
cc: kvm@vger.kernel.org
Cc: LKML <linux-kernel@vger.kernel.org>
cc: Fan Du <fan.du@intel.com>
cc: Peng Dong <dongx.peng@intel.com>
cc: Huang Ying <ying.huang@intel.com>
CC: Liu Jingqi <jingqi.liu@intel.com>
cc: Dong Eddie <eddie.dong@intel.com>
cc: Dave Hansen <dave.hansen@intel.com>
cc: Zhang Yi <yi.z.zhang@linux.intel.com>
cc: Dan Williams <dan.j.williams@intel.com>
Content-Disposition: inline; filename=0001-kvm-allocate-page-table-pages-from-DRAM.patch
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

From: Yao Yuan <yuan.yao@intel.com>

Signed-off-by: Yao Yuan <yuan.yao@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
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;