ad8d74559b
[ Upstream commit 78a509fba9c9b1fcb77f95b7c6be30da3d24823a ] When there are two racing NMIs on x86, the first NMI invokes NMI handler and the 2nd NMI is latched until IRET is executed. If panic on NMI and panic kexec are enabled, the first NMI triggers panic and starts booting the next kernel via kexec. Note that the 2nd NMI is still latched. During the early boot of the next kernel, once an IRET is executed as a result of a page fault, then the 2nd NMI is unlatched and invokes the NMI handler. However, NMI handler is not set up at the early stage of boot, which results in a boot failure. Avoid such problems by setting up a NOP handler for early NMIs. [ mingo: Refined the changelog. ] Signed-off-by: Jun'ichi Nomura <junichi.nomura@nec.com> Signed-off-by: Derek Barbosa <debarbos@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
166 lines
4 KiB
C
Executable file
166 lines
4 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BOOT_COMPRESSED_MISC_H
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#define BOOT_COMPRESSED_MISC_H
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/*
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* Special hack: we have to be careful, because no indirections are allowed here,
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* and paravirt_ops is a kind of one. As it will only run in baremetal anyway,
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* we just keep it from happening. (This list needs to be extended when new
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* paravirt and debugging variants are added.)
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*/
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#undef CONFIG_PARAVIRT
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#undef CONFIG_PARAVIRT_XXL
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#undef CONFIG_PARAVIRT_SPINLOCKS
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#undef CONFIG_KASAN
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#undef CONFIG_KASAN_GENERIC
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/* cpu_feature_enabled() cannot be used this early */
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#define USE_EARLY_PGTABLE_L5
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#include <linux/linkage.h>
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#include <linux/screen_info.h>
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#include <linux/elf.h>
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#include <linux/io.h>
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#include <asm/page.h>
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#include <asm/boot.h>
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#include <asm/bootparam.h>
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#include <asm/desc_defs.h>
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#define BOOT_CTYPE_H
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#include <linux/acpi.h>
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#define BOOT_BOOT_H
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#include "../ctype.h"
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#ifdef CONFIG_X86_64
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#define memptr long
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#else
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#define memptr unsigned
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#endif
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/* boot/compressed/vmlinux start and end markers */
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extern char _head[], _end[];
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/* misc.c */
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extern memptr free_mem_ptr;
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extern memptr free_mem_end_ptr;
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extern struct boot_params *boot_params;
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void __putstr(const char *s);
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void __puthex(unsigned long value);
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#define error_putstr(__x) __putstr(__x)
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#define error_puthex(__x) __puthex(__x)
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#ifdef CONFIG_X86_VERBOSE_BOOTUP
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#define debug_putstr(__x) __putstr(__x)
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#define debug_puthex(__x) __puthex(__x)
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#define debug_putaddr(__x) { \
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debug_putstr(#__x ": 0x"); \
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debug_puthex((unsigned long)(__x)); \
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debug_putstr("\n"); \
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}
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#else
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static inline void debug_putstr(const char *s)
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{ }
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static inline void debug_puthex(unsigned long value)
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{ }
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#define debug_putaddr(x) /* */
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#endif
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/* cmdline.c */
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int cmdline_find_option(const char *option, char *buffer, int bufsize);
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int cmdline_find_option_bool(const char *option);
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struct mem_vector {
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u64 start;
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u64 size;
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};
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#if CONFIG_RANDOMIZE_BASE
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/* kaslr.c */
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void choose_random_location(unsigned long input,
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unsigned long input_size,
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unsigned long *output,
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unsigned long output_size,
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unsigned long *virt_addr);
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#else
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static inline void choose_random_location(unsigned long input,
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unsigned long input_size,
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unsigned long *output,
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unsigned long output_size,
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unsigned long *virt_addr)
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{
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}
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#endif
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/* cpuflags.c */
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bool has_cpuflag(int flag);
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#ifdef CONFIG_X86_64
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extern int set_page_decrypted(unsigned long address);
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extern int set_page_encrypted(unsigned long address);
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extern int set_page_non_present(unsigned long address);
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extern unsigned char _pgtable[];
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#endif
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#ifdef CONFIG_EARLY_PRINTK
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/* early_serial_console.c */
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extern int early_serial_base;
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void console_init(void);
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#else
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static const int early_serial_base;
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static inline void console_init(void)
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{ }
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#endif
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void set_sev_encryption_mask(void);
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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void sev_es_shutdown_ghcb(void);
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extern bool sev_es_check_ghcb_fault(unsigned long address);
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#else
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static inline void sev_es_shutdown_ghcb(void) { }
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static inline bool sev_es_check_ghcb_fault(unsigned long address)
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{
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return false;
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}
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#endif
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/* acpi.c */
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#ifdef CONFIG_ACPI
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acpi_physical_address get_rsdp_addr(void);
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#else
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static inline acpi_physical_address get_rsdp_addr(void) { return 0; }
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#endif
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#if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI)
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extern struct mem_vector immovable_mem[MAX_NUMNODES*2];
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int count_immovable_mem_regions(void);
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#else
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static inline int count_immovable_mem_regions(void) { return 0; }
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#endif
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/* ident_map_64.c */
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#ifdef CONFIG_X86_5LEVEL
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extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d;
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#endif
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/* Used by PAGE_KERN* macros: */
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extern pteval_t __default_kernel_pte_mask;
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/* idt_64.c */
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extern gate_desc boot_idt[BOOT_IDT_ENTRIES];
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extern struct desc_ptr boot_idt_desc;
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/* IDT Entry Points */
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void boot_page_fault(void);
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void boot_nmi_trap(void);
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void boot_stage1_vc(void);
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void boot_stage2_vc(void);
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unsigned long sev_verify_cbit(unsigned long cr3);
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#endif /* BOOT_COMPRESSED_MISC_H */
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