Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
"Misc fixes:
- MCE related boot crash fix on certain AMD systems
- FPU exception handling fix
- FPU handling race fix
- revert+rewrite of the RSDP boot protocol extension, use boot_params
instead
- documentation fix"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/MCE/AMD: Fix the thresholding machinery initialization order
x86/fpu: Use the correct exception table macro in the XSTATE_OP wrapper
x86/fpu: Disable bottom halves while loading FPU registers
x86/acpi, x86/boot: Take RSDP address from boot params if available
x86/boot: Mostly revert commit ae7e1238e6 ("Add ACPI RSDP address to setup_header")
x86/ptrace: Fix documentation for tracehook_report_syscall_entry()
hifive-unleashed-5.1
Linus Torvalds
commit
1ec63573b2
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@ -61,18 +61,6 @@ Protocol 2.12: (Kernel 3.8) Added the xloadflags field and extension fields
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to struct boot_params for loading bzImage and ramdisk
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above 4G in 64bit.
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Protocol 2.13: (Kernel 3.14) Support 32- and 64-bit flags being set in
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xloadflags to support booting a 64-bit kernel from 32-bit
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EFI
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Protocol 2.14: (Kernel 4.20) Added acpi_rsdp_addr holding the physical
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address of the ACPI RSDP table.
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The bootloader updates version with:
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0x8000 | min(kernel-version, bootloader-version)
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kernel-version being the protocol version supported by
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the kernel and bootloader-version the protocol version
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supported by the bootloader.
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**** MEMORY LAYOUT
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The traditional memory map for the kernel loader, used for Image or
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@ -209,7 +197,6 @@ Offset Proto Name Meaning
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0258/8 2.10+ pref_address Preferred loading address
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0260/4 2.10+ init_size Linear memory required during initialization
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0264/4 2.11+ handover_offset Offset of handover entry point
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0268/8 2.14+ acpi_rsdp_addr Physical address of RSDP table
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(1) For backwards compatibility, if the setup_sects field contains 0, the
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real value is 4.
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@ -322,7 +309,7 @@ Protocol: 2.00+
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Contains the magic number "HdrS" (0x53726448).
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Field name: version
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Type: modify
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Type: read
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Offset/size: 0x206/2
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Protocol: 2.00+
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@ -330,12 +317,6 @@ Protocol: 2.00+
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e.g. 0x0204 for version 2.04, and 0x0a11 for a hypothetical version
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10.17.
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Up to protocol version 2.13 this information is only read by the
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bootloader. From protocol version 2.14 onwards the bootloader will
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write the used protocol version or-ed with 0x8000 to the field. The
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used protocol version will be the minimum of the supported protocol
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versions of the bootloader and the kernel.
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Field name: realmode_swtch
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Type: modify (optional)
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Offset/size: 0x208/4
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@ -763,17 +744,6 @@ Offset/size: 0x264/4
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See EFI HANDOVER PROTOCOL below for more details.
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Field name: acpi_rsdp_addr
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Type: write
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Offset/size: 0x268/8
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Protocol: 2.14+
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This field can be set by the boot loader to tell the kernel the
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physical address of the ACPI RSDP table.
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A value of 0 indicates the kernel should fall back to the standard
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methods to locate the RSDP.
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**** THE IMAGE CHECKSUM
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@ -300,7 +300,7 @@ _start:
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# Part 2 of the header, from the old setup.S
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.ascii "HdrS" # header signature
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.word 0x020e # header version number (>= 0x0105)
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.word 0x020d # header version number (>= 0x0105)
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# or else old loadlin-1.5 will fail)
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.globl realmode_swtch
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realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
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@ -558,10 +558,6 @@ pref_address: .quad LOAD_PHYSICAL_ADDR # preferred load addr
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init_size: .long INIT_SIZE # kernel initialization size
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handover_offset: .long 0 # Filled in by build.c
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acpi_rsdp_addr: .quad 0 # 64-bit physical pointer to the
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# ACPI RSDP table, added with
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# version 2.14
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# End of setup header #####################################################
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.section ".entrytext", "ax"
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@ -226,7 +226,7 @@ static inline void copy_fxregs_to_kernel(struct fpu *fpu)
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"3: movl $-2,%[err]\n\t" \
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"jmp 2b\n\t" \
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".popsection\n\t" \
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_ASM_EXTABLE_UA(1b, 3b) \
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_ASM_EXTABLE(1b, 3b) \
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: [err] "=r" (err) \
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: "D" (st), "m" (*st), "a" (lmask), "d" (hmask) \
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: "memory")
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@ -303,6 +303,4 @@ extern void x86_init_noop(void);
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extern void x86_init_uint_noop(unsigned int unused);
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extern bool x86_pnpbios_disabled(void);
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void x86_verify_bootdata_version(void);
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#endif
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@ -16,9 +16,6 @@
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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/* version flags */
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#define VERSION_WRITTEN 0x8000
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/* loadflags */
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#define LOADED_HIGH (1<<0)
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#define KASLR_FLAG (1<<1)
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@ -89,7 +86,6 @@ struct setup_header {
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__u64 pref_address;
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__u32 init_size;
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__u32 handover_offset;
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__u64 acpi_rsdp_addr;
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} __attribute__((packed));
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struct sys_desc_table {
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@ -159,7 +155,8 @@ struct boot_params {
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__u8 _pad2[4]; /* 0x054 */
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__u64 tboot_addr; /* 0x058 */
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struct ist_info ist_info; /* 0x060 */
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__u8 _pad3[16]; /* 0x070 */
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__u64 acpi_rsdp_addr; /* 0x070 */
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__u8 _pad3[8]; /* 0x078 */
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__u8 hd0_info[16]; /* obsolete! */ /* 0x080 */
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__u8 hd1_info[16]; /* obsolete! */ /* 0x090 */
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struct sys_desc_table sys_desc_table; /* obsolete! */ /* 0x0a0 */
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@ -1776,5 +1776,5 @@ void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
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u64 x86_default_get_root_pointer(void)
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{
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return boot_params.hdr.acpi_rsdp_addr;
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return boot_params.acpi_rsdp_addr;
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}
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@ -56,7 +56,7 @@
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/* Threshold LVT offset is at MSR0xC0000410[15:12] */
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#define SMCA_THR_LVT_OFF 0xF000
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static bool thresholding_en;
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static bool thresholding_irq_en;
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static const char * const th_names[] = {
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"load_store",
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@ -534,9 +534,8 @@ prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr,
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set_offset:
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offset = setup_APIC_mce_threshold(offset, new);
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if ((offset == new) && (mce_threshold_vector != amd_threshold_interrupt))
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mce_threshold_vector = amd_threshold_interrupt;
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if (offset == new)
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thresholding_irq_en = true;
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done:
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mce_threshold_block_init(&b, offset);
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@ -1357,9 +1356,6 @@ int mce_threshold_remove_device(unsigned int cpu)
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{
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unsigned int bank;
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if (!thresholding_en)
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return 0;
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for (bank = 0; bank < mca_cfg.banks; ++bank) {
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if (!(per_cpu(bank_map, cpu) & (1 << bank)))
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continue;
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@ -1377,9 +1373,6 @@ int mce_threshold_create_device(unsigned int cpu)
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struct threshold_bank **bp;
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int err = 0;
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if (!thresholding_en)
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return 0;
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bp = per_cpu(threshold_banks, cpu);
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if (bp)
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return 0;
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@ -1408,9 +1401,6 @@ static __init int threshold_init_device(void)
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{
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unsigned lcpu = 0;
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if (mce_threshold_vector == amd_threshold_interrupt)
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thresholding_en = true;
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/* to hit CPUs online before the notifier is up */
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for_each_online_cpu(lcpu) {
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int err = mce_threshold_create_device(lcpu);
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@ -1419,6 +1409,9 @@ static __init int threshold_init_device(void)
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return err;
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}
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if (thresholding_irq_en)
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mce_threshold_vector = amd_threshold_interrupt;
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return 0;
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}
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/*
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@ -344,10 +344,10 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
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sanitize_restored_xstate(tsk, &env, xfeatures, fx_only);
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}
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local_bh_disable();
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fpu->initialized = 1;
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preempt_disable();
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fpu__restore(fpu);
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preempt_enable();
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local_bh_enable();
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return err;
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} else {
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@ -37,7 +37,6 @@ asmlinkage __visible void __init i386_start_kernel(void)
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cr4_init_shadow();
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sanitize_boot_params(&boot_params);
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x86_verify_bootdata_version();
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x86_early_init_platform_quirks();
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@ -457,8 +457,6 @@ void __init x86_64_start_reservations(char *real_mode_data)
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if (!boot_params.hdr.version)
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copy_bootdata(__va(real_mode_data));
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x86_verify_bootdata_version();
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x86_early_init_platform_quirks();
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switch (boot_params.hdr.hardware_subarch) {
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@ -1280,23 +1280,6 @@ void __init setup_arch(char **cmdline_p)
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unwind_init();
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}
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/*
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* From boot protocol 2.14 onwards we expect the bootloader to set the
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* version to "0x8000 | <used version>". In case we find a version >= 2.14
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* without the 0x8000 we assume the boot loader supports 2.13 only and
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* reset the version accordingly. The 0x8000 flag is removed in any case.
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*/
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void __init x86_verify_bootdata_version(void)
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{
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if (boot_params.hdr.version & VERSION_WRITTEN)
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boot_params.hdr.version &= ~VERSION_WRITTEN;
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else if (boot_params.hdr.version >= 0x020e)
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boot_params.hdr.version = 0x020d;
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if (boot_params.hdr.version < 0x020e)
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boot_params.hdr.acpi_rsdp_addr = 0;
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}
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#ifdef CONFIG_X86_32
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static struct resource video_ram_resource = {
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@ -83,8 +83,8 @@ static inline int ptrace_report_syscall(struct pt_regs *regs)
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* tracehook_report_syscall_entry - task is about to attempt a system call
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* @regs: user register state of current task
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*
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* This will be called if %TIF_SYSCALL_TRACE has been set, when the
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* current task has just entered the kernel for a system call.
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* This will be called if %TIF_SYSCALL_TRACE or %TIF_SYSCALL_EMU have been set,
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* when the current task has just entered the kernel for a system call.
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* Full user register state is available here. Changing the values
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* in @regs can affect the system call number and arguments to be tried.
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* It is safe to block here, preventing the system call from beginning.
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