Messages in this thread Patch in this message | | | Date | Tue, 05 May 2020 15:49:39 +0200 | From | Thomas Gleixner <> | Subject | [patch V4 part 4 13/24] x86/entry: Convert NMI to IDTENTRY_NMI |
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Convert #NMI to IDTENTRY_NMI: - Implement the C entry point with DEFINE_IDTENTRY_NMI - Fixup the XEN/PV code - Remove the old prototyoes
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/entry/entry_32.S | 8 ++++---- arch/x86/entry/entry_64.S | 15 +++++++-------- arch/x86/include/asm/idtentry.h | 4 ++++ arch/x86/include/asm/traps.h | 3 --- arch/x86/kernel/idt.c | 4 ++-- arch/x86/kernel/nmi.c | 4 +--- arch/x86/xen/enlighten_pv.c | 7 ++++++- arch/x86/xen/xen-asm_64.S | 2 +- 8 files changed, 25 insertions(+), 22 deletions(-)
--- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -1547,7 +1547,7 @@ SYM_CODE_END(double_fault) * switched stacks. We handle both conditions by simply checking whether we * interrupted kernel code running on the SYSENTER stack. */ -SYM_CODE_START(nmi) +SYM_CODE_START(asm_exc_nmi) ASM_CLAC #ifdef CONFIG_X86_ESPFIX32 @@ -1576,7 +1576,7 @@ SYM_CODE_START(nmi) jb .Lnmi_from_sysenter_stack /* Not on SYSENTER stack. */ - call do_nmi + call exc_nmi jmp .Lnmi_return .Lnmi_from_sysenter_stack: @@ -1586,7 +1586,7 @@ SYM_CODE_START(nmi) */ movl %esp, %ebx movl PER_CPU_VAR(cpu_current_top_of_stack), %esp - call do_nmi + call exc_nmi movl %ebx, %esp .Lnmi_return: @@ -1640,7 +1640,7 @@ SYM_CODE_START(nmi) lss (1+5+6)*4(%esp), %esp # back to espfix stack jmp .Lirq_return #endif -SYM_CODE_END(nmi) +SYM_CODE_END(asm_exc_nmi) .pushsection .text, "ax" SYM_CODE_START(rewind_stack_do_exit) --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1080,7 +1080,6 @@ idtentry_df X86_TRAP_DF double_fault d #ifdef CONFIG_XEN_PV idtentry 512 /* dummy */ hypervisor_callback xen_do_hypervisor_callback has_error_code=0 -idtentry X86_TRAP_NMI xennmi do_nmi has_error_code=0 idtentry X86_TRAP_DB xendebug do_debug has_error_code=0 #endif @@ -1416,7 +1415,7 @@ SYM_CODE_END(error_return) * %r14: Used to save/restore the CR3 of the interrupted context * when PAGE_TABLE_ISOLATION is in use. Do not clobber. */ -SYM_CODE_START(nmi) +SYM_CODE_START(asm_exc_nmi) UNWIND_HINT_IRET_REGS /* @@ -1501,7 +1500,7 @@ SYM_CODE_START(nmi) movq %rsp, %rdi movq $-1, %rsi - call do_nmi + call exc_nmi /* * Return back to user mode. We must *not* do the normal exit @@ -1558,7 +1557,7 @@ SYM_CODE_START(nmi) * end_repeat_nmi, then we are a nested NMI. We must not * modify the "iret" frame because it's being written by * the outer NMI. That's okay; the outer NMI handler is - * about to about to call do_nmi anyway, so we can just + * about to about to call exc_nmi() anyway, so we can just * resume the outer NMI. */ @@ -1677,7 +1676,7 @@ SYM_CODE_START(nmi) * RSP is pointing to "outermost RIP". gsbase is unknown, but, if * we're repeating an NMI, gsbase has the same value that it had on * the first iteration. paranoid_entry will load the kernel - * gsbase if needed before we call do_nmi. "NMI executing" + * gsbase if needed before we call exc_nmi(). "NMI executing" * is zero. */ movq $1, 10*8(%rsp) /* Set "NMI executing". */ @@ -1711,10 +1710,10 @@ SYM_CODE_START(nmi) call paranoid_entry UNWIND_HINT_REGS - /* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */ + /* paranoidentry exc_nmi(), 0; without TRACE_IRQS_OFF */ movq %rsp, %rdi movq $-1, %rsi - call do_nmi + call exc_nmi /* Always restore stashed CR3 value (see paranoid_entry) */ RESTORE_CR3 scratch_reg=%r15 save_reg=%r14 @@ -1751,7 +1750,7 @@ SYM_CODE_START(nmi) * about espfix64 on the way back to kernel mode. */ iretq -SYM_CODE_END(nmi) +SYM_CODE_END(asm_exc_nmi) #ifndef CONFIG_IA32_EMULATION /* --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -260,4 +260,8 @@ DECLARE_IDTENTRY_RAW(X86_TRAP_BP, exc_in DECLARE_IDTENTRY_MCE(X86_TRAP_MC, exc_machine_check); #endif +/* NMI */ +DECLARE_IDTENTRY_NMI(X86_TRAP_NMI, exc_nmi); +DECLARE_IDTENTRY_XEN(X86_TRAP_NMI, nmi); + #endif --- a/arch/x86/include/asm/traps.h +++ b/arch/x86/include/asm/traps.h @@ -12,7 +12,6 @@ #define dotraplinkage __visible asmlinkage void debug(void); -asmlinkage void nmi(void); #ifdef CONFIG_X86_64 asmlinkage void double_fault(void); #endif @@ -20,14 +19,12 @@ asmlinkage void page_fault(void); asmlinkage void async_page_fault(void); #if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV) -asmlinkage void xen_xennmi(void); asmlinkage void xen_xendebug(void); asmlinkage void xen_double_fault(void); asmlinkage void xen_page_fault(void); #endif dotraplinkage void do_debug(struct pt_regs *regs, long error_code); -dotraplinkage void do_nmi(struct pt_regs *regs, long error_code); #if defined(CONFIG_X86_64) || defined(CONFIG_DOUBLEFAULT) dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2); #endif --- a/arch/x86/kernel/idt.c +++ b/arch/x86/kernel/idt.c @@ -71,7 +71,7 @@ static const __initconst struct idt_data */ static const __initconst struct idt_data def_idts[] = { INTG(X86_TRAP_DE, asm_exc_divide_error), - INTG(X86_TRAP_NMI, nmi), + INTG(X86_TRAP_NMI, asm_exc_nmi), INTG(X86_TRAP_BR, asm_exc_bounds), INTG(X86_TRAP_UD, asm_exc_invalid_op), INTG(X86_TRAP_NM, asm_exc_device_not_available), @@ -183,7 +183,7 @@ gate_desc debug_idt_table[IDT_ENTRIES] _ */ static const __initconst struct idt_data ist_idts[] = { ISTG(X86_TRAP_DB, debug, IST_INDEX_DB), - ISTG(X86_TRAP_NMI, nmi, IST_INDEX_NMI), + ISTG(X86_TRAP_NMI, asm_exc_nmi, IST_INDEX_NMI), ISTG(X86_TRAP_DF, double_fault, IST_INDEX_DF), #ifdef CONFIG_X86_MCE ISTG(X86_TRAP_MC, asm_exc_machine_check, IST_INDEX_MCE), --- a/arch/x86/kernel/nmi.c +++ b/arch/x86/kernel/nmi.c @@ -507,8 +507,7 @@ static bool notrace is_debug_stack(unsig NOKPROBE_SYMBOL(is_debug_stack); #endif -dotraplinkage notrace void -do_nmi(struct pt_regs *regs, long error_code) +DEFINE_IDTENTRY_NMI(exc_nmi) { if (IS_ENABLED(CONFIG_SMP) && cpu_is_offline(smp_processor_id())) return; @@ -558,7 +557,6 @@ do_nmi(struct pt_regs *regs, long error_ if (user_mode(regs)) mds_user_clear_cpu_buffers(); } -NOKPROBE_SYMBOL(do_nmi); void stop_nmi(void) { --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -610,13 +610,18 @@ struct trap_array_entry { .xen = xen_asm_##func, \ .ist_okay = ist_ok } +#define TRAP_ENTRY_REDIR(func, xenfunc, ist_ok) { \ + .orig = asm_##func, \ + .xen = xen_asm_##xenfunc, \ + .ist_okay = ist_ok } + static struct trap_array_entry trap_array[] = { { debug, xen_xendebug, true }, { double_fault, xen_double_fault, true }, #ifdef CONFIG_X86_MCE TRAP_ENTRY(exc_machine_check, true ), #endif - { nmi, xen_xennmi, true }, + TRAP_ENTRY_REDIR(exc_nmi, exc_xennmi, true ), TRAP_ENTRY(exc_int3, false ), TRAP_ENTRY(exc_overflow, false ), #ifdef CONFIG_IA32_EMULATION --- a/arch/x86/xen/xen-asm_64.S +++ b/arch/x86/xen/xen-asm_64.S @@ -32,7 +32,7 @@ xen_pv_trap asm_exc_divide_error xen_pv_trap debug xen_pv_trap xendebug xen_pv_trap asm_exc_int3 -xen_pv_trap xennmi +xen_pv_trap asm_exc_xennmi xen_pv_trap asm_exc_overflow xen_pv_trap asm_exc_bounds xen_pv_trap asm_exc_invalid_op
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