linux-kernel - [PATCH v6 2/3] x86/boot/KASLR: Walk srat tables to filter immovable memory

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Date:   Mon, 10 Sep 2018 20:40:14 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <keescook@...omium.org>, <bhe@...hat.com>
CC:     <indou.takao@...fujitsu.com>, <caoj.fnst@...fujitsu.com>,
        <douly.fnst@...fujitsu.com>, Chao Fan <fanc.fnst@...fujitsu.com>
Subject: [PATCH v6 2/3] x86/boot/KASLR: Walk srat tables to filter immovable memory

If CONFIG_MEMORY_HOTREMOVE enabled, walk through the acpi srat memory
tables and store those immovable memory regions so that kaslr can get
where to choose for randomization.

Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
---
 arch/x86/boot/compressed/kaslr.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index d1e19f358b6e..3d839040cc7f 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -101,6 +101,11 @@ static bool memmap_too_large;
 /* Store memory limit specified by "mem=nn[KMG]" or "memmap=nn[KMG]" */
 static unsigned long long mem_limit = ULLONG_MAX;
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
+/* Store the immovable memory regions */
+extern struct mem_vector immovable_mem[MAX_NUMNODES*2];
+#endif
+
 
 enum mem_avoid_index {
 	MEM_AVOID_ZO_RANGE = 0,
@@ -418,6 +423,11 @@ static void mem_avoid_init(unsigned long input, unsigned long input_size,
 	/* Mark the memmap regions we need to avoid */
 	handle_mem_options();
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
+	/* Mark the immovable regions we need to choose */
+	get_immovable_mem();
+#endif
+
 #ifdef CONFIG_X86_VERBOSE_BOOTUP
 	/* Make sure video RAM can be used. */
 	add_identity_map(0, PMD_SIZE);
-- 
2.17.1