linux-kernel - [PATCH v4 3/4] kaslr: disable memory mirror feature when movable

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Date:   Tue, 12 Dec 2017 20:07:04 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <hpa@...or.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bhe@...hat.com>,
        <keescook@...omium.org>, <yasu.isimatu@...il.com>
CC:     <indou.takao@...fujitsu.com>, <caoj.fnst@...fujitsu.com>,
        <douly.fnst@...fujitsu.com>, Chao Fan <fanc.fnst@...fujitsu.com>,
        <linux-doc@...r.kernel.org>, Jonathan Corbet <corbet@....net>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: [PATCH v4 3/4] kaslr: disable memory mirror feature when movable_node

In kernel code, if movable_node specified, it will skip the mirror
feature. So we should also skip mirror feature in kaslr.

Cc: linux-doc@...r.kernel.org
Cc: Jonathan Corbet <corbet@....net>
Cc: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
---
 arch/x86/boot/compressed/kaslr.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index fe49d6e79c50..203bec3d400d 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -714,6 +714,7 @@ static bool
 process_efi_entries(unsigned long minimum, unsigned long image_size)
 {
 	struct efi_info *e = &boot_params->efi_info;
+	char *args = (char *)get_cmd_line_ptr();
 	bool efi_mirror_found = false;
 	struct mem_vector region;
 	efi_memory_desc_t *md;
@@ -747,6 +748,12 @@ process_efi_entries(unsigned long minimum, unsigned long image_size)
 		}
 	}
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+	/* Skip memory mirror if movabale_node or immovable_mem specified */
+	if (strstr(args, "movable_node"))
+		efi_mirror_found = false;
+#endif
+
 	for (i = 0; i < nr_desc; i++) {
 		md = efi_early_memdesc_ptr(pmap, e->efi_memdesc_size, i);
 
-- 
2.14.3