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Message-ID: <20181021023458.GJ1885@192.168.1.4>
Date: Sun, 21 Oct 2018 10:34:58 +0800
From: Baoquan He <bhe@...hat.com>
To: Chao Fan <fanc.fnst@...fujitsu.com>
Cc: 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, msys.mizuma@...il.com,
indou.takao@...fujitsu.com, caoj.fnst@...fujitsu.com
Subject: Re: [PATCH v9 6/8] x86/boot: Dig out SRAT table from RSDP and find
immovable memory
On 10/17/18 at 06:20pm, Chao Fan wrote:
> 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;
> +};
Why not moving this definition to misc.h? There has been a mem_vector in
boot/compressed/kaslr.c.
> +/* 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)
No warning message printed in this case?
> + 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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