linux-kernel - [PATCH v7 2/3] x86/boot/KASLR: Walk srat tables to filter immovable memory

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Date:   Thu, 13 Sep 2018 18:46:28 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     <linux-efi@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <keescook@...omium.org>, <bhe@...hat.com>
CC:     <rjw@...ysocki.net>, <lenb@...nel.org>,
        <ard.biesheuvel@...aro.org>, <indou.takao@...fujitsu.com>,
        <caoj.fnst@...fujitsu.com>, Chao Fan <fanc.fnst@...fujitsu.com>
Subject: [PATCH v7 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 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 9ed9709d9947..0c3567bc231c 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -417,6 +417,11 @@ 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