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From: Rick Edgecombe <rick.p.edgecombe@intel.com>
To: dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org,
	x86@kernel.org, akpm@linux-foundation.org, keescook@chromium.org,
	shakeelb@google.com, vbabka@suse.cz, rppt@kernel.org
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>,
	linux-mm@kvack.org, linux-hardening@vger.kernel.org,
	kernel-hardening@lists.openwall.com, ira.weiny@intel.com,
	dan.j.williams@intel.com, linux-kernel@vger.kernel.org
Subject: [RFC PATCH v2 12/19] x86/mm: Use free_table in unmap path
Date: Mon, 30 Aug 2021 16:59:20 -0700	[thread overview]
Message-ID: <20210830235927.6443-13-rick.p.edgecombe@intel.com> (raw)
In-Reply-To: <20210830235927.6443-1-rick.p.edgecombe@intel.com>

Memory hot unplug and memremap unmap paths will free direct map page
tables. So use free_table() for this.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
 arch/x86/mm/init_64.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index de5a785ee89f..c2680a77ca88 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -975,7 +975,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
 	return add_pages(nid, start_pfn, nr_pages, params);
 }
 
-static void __meminit free_pagetable(struct page *page, int order)
+static void __meminit free_pagetable(struct page *page, int order, bool table)
 {
 	unsigned long magic;
 	unsigned int nr_pages = 1 << order;
@@ -991,8 +991,14 @@ static void __meminit free_pagetable(struct page *page, int order)
 		} else
 			while (nr_pages--)
 				free_reserved_page(page++);
-	} else
-		free_pages((unsigned long)page_address(page), order);
+	} else {
+		if (table) {
+			/* The page tables will always be order 0. */
+			free_table(page);
+		} else {
+			free_pages((unsigned long)page_address(page), order);
+		}
+	}
 }
 
 static void __meminit gather_table(struct page *page, struct list_head *tables)
@@ -1008,7 +1014,7 @@ static void __meminit gather_table_finish(struct list_head *tables)
 
 	list_for_each_entry_safe(page, next, tables, lru) {
 		list_del(&page->lru);
-		free_pagetable(page, 0);
+		free_pagetable(page, 0, true);
 	}
 }
 
@@ -1018,7 +1024,7 @@ static void __meminit free_hugepage_table(struct page *page,
 	if (altmap)
 		vmem_altmap_free(altmap, PMD_SIZE / PAGE_SIZE);
 	else
-		free_pagetable(page, get_order(PMD_SIZE));
+		free_pagetable(page, get_order(PMD_SIZE), false);
 }
 
 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd, struct list_head *tables)
@@ -1102,7 +1108,7 @@ remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
 			return;
 
 		if (!direct)
-			free_pagetable(pte_page(*pte), 0);
+			free_pagetable(pte_page(*pte), 0, false);
 
 		spin_lock(&init_mm.page_table_lock);
 		pte_clear(&init_mm, addr, pte);
-- 
2.17.1


  parent reply	other threads:[~2021-08-31  0:02 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-30 23:59 [RFC PATCH v2 00/19] PKS write protected page tables Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 01/19] list: Support getting most recent element in list_lru Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 02/19] list: Support list head not in object for list_lru Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 03/19] x86/mm/cpa: Add grouped page allocations Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 04/19] mm: Explicitly zero page table lock ptr Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 05/19] x86, mm: Use cache of page tables Rick Edgecombe
2021-08-31  8:40   ` Mike Rapoport
2021-08-31 19:09     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 06/19] x86/mm/cpa: Add perm callbacks to grouped pages Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 07/19] x86/cpufeatures: Add feature for pks tables Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 08/19] x86/mm/cpa: Add get_grouped_page_atomic() Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 09/19] x86/mm: Support GFP_ATOMIC in alloc_table_node() Rick Edgecombe
2021-08-31  8:32   ` Mike Rapoport
2021-08-30 23:59 ` [RFC PATCH v2 10/19] x86/mm: Use alloc_table() for fill_pte(), etc Rick Edgecombe
2021-08-31  8:47   ` Mike Rapoport
2021-08-31 18:48     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 11/19] mm/sparsemem: Use alloc_table() for table allocations Rick Edgecombe
2021-08-31  8:55   ` Mike Rapoport
2021-08-31 18:25     ` Edgecombe, Rick P
2021-09-01  7:22       ` Mike Rapoport
2021-09-02 13:56         ` Vlastimil Babka
2021-08-30 23:59 ` Rick Edgecombe [this message]
2021-08-30 23:59 ` [RFC PATCH v2 13/19] mm/debug_vm_page_table: Use setters instead of WRITE_ONCE Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 14/19] x86/efi: Toggle table protections when copying Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 15/19] x86/mm/cpa: Add set_memory_pks() Rick Edgecombe
2021-08-30 23:59 ` [RFC PATCH v2 16/19] x86/mm: Protect page tables with PKS Rick Edgecombe
2021-08-31  8:56   ` Mike Rapoport
2021-08-31 17:55     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 17/19] x86/mm/cpa: PKS protect direct map page tables Rick Edgecombe
2021-08-31 10:14   ` Mike Rapoport
2021-08-31 17:58     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 18/19] x86/mm: Add PKS table soft mode Rick Edgecombe
2021-08-31  3:49   ` Randy Dunlap
2021-08-31 17:55     ` Edgecombe, Rick P
2021-08-30 23:59 ` [RFC PATCH v2 19/19] x86/mm: Add PKS table debug checking Rick Edgecombe
2024-03-14 16:27 ` [RFC PATCH v2 00/19] PKS write protected page tables Kees Cook
2024-03-14 17:10   ` Edgecombe, Rick P
2024-03-14 18:25     ` Ira Weiny
2024-03-14 21:02       ` Boris Lukashev
2024-03-16  3:14 ` Boris Lukashev

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