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Message-ID: <20181017102012.872-7-fanc.fnst@cn.fujitsu.com>
Date: Wed, 17 Oct 2018 18:20:10 +0800
From: Chao Fan <fanc.fnst@...fujitsu.com>
To: <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
<linux-efi@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
<bp@...en8.de>, <tglx@...utronix.de>, <mingo@...hat.com>,
<hpa@...or.com>, <keescook@...omium.org>, <bhe@...hat.com>,
<msys.mizuma@...il.com>
CC: <indou.takao@...fujitsu.com>, <caoj.fnst@...fujitsu.com>,
<fanc.fnst@...fujitsu.com>
Subject: [PATCH v9 6/8] x86/boot: Dig out SRAT table from RSDP and find immovable memory
Dig out SRAT table from RSDP, and then walk all memory to find
the immovable memory regions, and fill in the immovable_mem[].
So that we can use it to select memory for KASLR.
Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
---
arch/x86/boot/compressed/Makefile | 4 +
arch/x86/boot/compressed/acpitb.c | 129 ++++++++++++++++++++++++++++++
arch/x86/boot/compressed/misc.h | 10 +++
3 files changed, 143 insertions(+)
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 28764dacf018..f67674d7d2bd 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -83,6 +83,10 @@ ifdef CONFIG_X86_64
vmlinux-objs-y += $(obj)/pgtable_64.o
endif
+#ifdef CONFIG_MEMORY_HOTREMOVE && CONFIG_RANDOMIZE_BASE
+vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/acpitb.o
+#endif
+
$(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone
vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \
diff --git a/arch/x86/boot/compressed/acpitb.c b/arch/x86/boot/compressed/acpitb.c
index 37b1f4407be8..d119663c05bb 100644
--- a/arch/x86/boot/compressed/acpitb.c
+++ b/arch/x86/boot/compressed/acpitb.c
@@ -11,6 +11,15 @@
#define STATIC
#include <linux/decompress/mm.h>
+#ifdef CONFIG_MEMORY_HOTREMOVE
+struct mem_vector {
+ unsigned long long start;
+ unsigned long long size;
+};
+/* Store the immovable memory regions */
+struct mem_vector immovable_mem[MAX_NUMNODES*2];
+#endif
+
/* Search EFI table for RSDP table. */
static void efi_get_rsdp_addr(acpi_physical_address *rsdp_addr)
{
@@ -223,3 +232,123 @@ static void get_acpi_rsdp(acpi_physical_address *rsdp_addr)
}
#endif
}
+
+/*
+ * Used to dig RSDP table from EFI table or BIOS.
+ * If RSDP table found in EFI table, use it. Or search BIOS.
+ * Based on acpi_os_get_root_pointer().
+ */
+static acpi_physical_address get_rsdp_addr(void)
+{
+ acpi_physical_address pa = 0;
+
+ get_acpi_rsdp(&pa);
+
+ if (!pa)
+ efi_get_rsdp_addr(&pa);
+
+ if (!pa)
+ bios_get_rsdp_addr(&pa);
+
+ return pa;
+}
+
+static struct acpi_table_header *get_acpi_srat_table(void)
+{
+ acpi_physical_address acpi_table;
+ acpi_physical_address root_table;
+ struct acpi_table_header *header;
+ struct acpi_table_rsdp *rsdp;
+ char *signature;
+ u8 *entry;
+ u32 count;
+ u32 size;
+ int i, j;
+ u32 len;
+
+ rsdp = (struct acpi_table_rsdp *)get_rsdp_addr();
+ if (!rsdp)
+ return NULL;
+
+ /* Get RSDT or XSDT from RSDP. */
+ if (!cmdline_find_option_arg("acpi", "rsdt", 4) &&
+ rsdp->xsdt_physical_address && rsdp->revision > 1) {
+ root_table = rsdp->xsdt_physical_address;
+ size = ACPI_XSDT_ENTRY_SIZE;
+ } else {
+ root_table = rsdp->rsdt_physical_address;
+ size = ACPI_RSDT_ENTRY_SIZE;
+ }
+
+ /* Get ACPI root table from RSDT or XSDT.*/
+ header = (struct acpi_table_header *)root_table;
+ len = header->length;
+ count = (u32)((len - sizeof(struct acpi_table_header)) / size);
+ entry = ACPI_ADD_PTR(u8, header, sizeof(struct acpi_table_header));
+
+ for (i = 0; i < count; i++) {
+ u64 address64;
+
+ if (size == ACPI_RSDT_ENTRY_SIZE)
+ acpi_table = ((acpi_physical_address)
+ (*ACPI_CAST_PTR(u32, entry)));
+ else {
+ *(u64 *)(void *)&address64 = *(u64 *)(void *)entry;
+ acpi_table = (acpi_physical_address) address64;
+ }
+
+ if (acpi_table) {
+ header = (struct acpi_table_header *)acpi_table;
+ signature = header->signature;
+
+ if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_SRAT))
+ return header;
+ }
+ entry += size;
+ }
+ return NULL;
+}
+
+/*
+ * According to ACPI table, filter the immvoable memory regions
+ * and store them in immovable_mem[].
+ */
+void get_immovable_mem(void)
+{
+ struct acpi_table_header *table_header;
+ struct acpi_subtable_header *table;
+ struct acpi_srat_mem_affinity *ma;
+ unsigned long table_end;
+ int i = 0;
+
+ if (!cmdline_find_option_bool("movable_node") ||
+ cmdline_find_option_arg("acpi", "off", 3))
+ return;
+
+ table_header = get_acpi_srat_table();
+ if (!table_header)
+ return;
+
+ table_end = (unsigned long)table_header + table_header->length;
+
+ table = (struct acpi_subtable_header *)
+ ((unsigned long)table_header + sizeof(struct acpi_table_srat));
+
+ while (((unsigned long)table) +
+ sizeof(struct acpi_subtable_header) < table_end) {
+ if (table->type == ACPI_SRAT_TYPE_MEMORY_AFFINITY) {
+ ma = (struct acpi_srat_mem_affinity *)table;
+ if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)) {
+ immovable_mem[i].start = ma->base_address;
+ immovable_mem[i].size = ma->length;
+ i++;
+ }
+
+ if (i >= MAX_NUMNODES*2)
+ break;
+ }
+ table = (struct acpi_subtable_header *)
+ ((unsigned long)table + table->length);
+ }
+ num_immovable_mem = i;
+}
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 40378408d980..70c403e1444c 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -121,3 +121,13 @@ static inline void console_init(void)
void set_sev_encryption_mask(void);
#endif
+
+/* acpitb.c */
+#ifdef CONFIG_RANDOMIZE_BASE
+int num_immovable_mem;
+#ifdef CONFIG_MEMORY_HOTREMOVE
+/* Store the amount of immovable memory regions */
+#define ACPI_MAX_TABLES 128
+void get_immovable_mem(void);
+#endif
+#endif
--
2.17.2
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