linux-kernel - [PATCH v9 4/5] x86/KASLR: Skip memory mirror handling if movable

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Date:   Wed, 28 Feb 2018 18:51:04 +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>, <lcapitulino@...hat.com>,
        Chao Fan <fanc.fnst@...fujitsu.com>
Subject: [PATCH v9 4/5] x86/KASLR: Skip memory mirror handling if movable_node specified

In kernel code, if 'movable_node' specified, it will skip the mirror
feature. So also skip mirror feature in KASLR.

Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
Acked-by: Baoquan He <bhe@...hat.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 9fb86248d5c5..d19085dbd6f5 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -698,6 +698,7 @@ 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;
@@ -731,6 +732,12 @@ process_efi_entries(unsigned long minimum, unsigned long image_size)
 		}
 	}
 
+#ifdef CONFIG_MEMORY_HOTPLUG
+	/* Skip memory mirror if 'movabale_node' 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