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x86/entry: Convert Machine Check to IDTENTRY_IST 

Convert #MC to IDTENTRY_MCE:
  - Implement the C entry points with DEFINE_IDTENTRY_MCE
  - Emit the ASM stub with DECLARE_IDTENTRY_MCE
  - Remove the ASM idtentry in 64bit
  - Remove the open coded ASM entry code in 32bit
  - Fixup the XEN/PV code
  - Remove the old prototypes
  - Remove the error code from *machine_check_vector() as
    it is always 0 and not used by any of the functions
    it can point to. Fixup all the functions as well.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505135314.334980426@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-25 23:33:23 +01:00
parent 94a46d316f
commit 8cd501c1fa
15 changed files with 33 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/entry/entry_32.S
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@ -1297,15 +1297,6 @@ SYM_CODE_START(native_iret)
SYM_CODE_END(native_iret)
#endif
#ifdef CONFIG_X86_MCE
SYM_CODE_START(machine_check)
ASM_CLAC
pushl $0
pushl $do_mce
jmp common_exception
SYM_CODE_END(machine_check)
#endif
#ifdef CONFIG_XEN_PV
SYM_FUNC_START(xen_hypervisor_callback)
/*

3
arch/x86/entry/entry_64.S
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@ -1074,9 +1074,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
idtentry X86_TRAP_PF page_fault do_page_fault has_error_code=1
#ifdef CONFIG_X86_MCE
idtentry_mce_db X86_TRAP_MCE machine_check do_mce
#endif
idtentry_mce_db X86_TRAP_DB debug do_debug
idtentry_df X86_TRAP_DF double_fault do_double_fault

4
arch/x86/include/asm/idtentry.h
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@ -238,4 +238,8 @@ DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_AC, exc_alignment_check);
/* Raw exception entries which need extra work */
DECLARE_IDTENTRY_RAW(X86_TRAP_BP, exc_int3);
#ifdef CONFIG_X86_MCE
DECLARE_IDTENTRY_MCE(X86_TRAP_MC, exc_machine_check);
#endif
#endif

2
arch/x86/include/asm/mce.h
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@ -238,7 +238,7 @@ extern void mce_disable_bank(int bank);
/*
* Exception handler
*/
void do_machine_check(struct pt_regs *, long);
void do_machine_check(struct pt_regs *pt_regs);
/*
* Threshold handler

7
arch/x86/include/asm/traps.h
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@ -18,25 +18,18 @@ asmlinkage void double_fault(void);
#endif
asmlinkage void page_fault(void);
asmlinkage void async_page_fault(void);
#ifdef CONFIG_X86_MCE
asmlinkage void machine_check(void);
#endif /* CONFIG_X86_MCE */
#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);
#ifdef CONFIG_X86_MCE
asmlinkage void xen_machine_check(void);
#endif /* CONFIG_X86_MCE */
#endif
dotraplinkage void do_debug(struct pt_regs *regs, long error_code);
dotraplinkage void do_nmi(struct pt_regs *regs, long error_code);
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2);
dotraplinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, unsigned long address);
dotraplinkage void do_mce(struct pt_regs *regs, long error_code);
#ifdef CONFIG_X86_64
asmlinkage __visible notrace struct pt_regs *sync_regs(struct pt_regs *eregs);

23
arch/x86/kernel/cpu/mce/core.c
View File

@ -1232,7 +1232,7 @@ static void kill_me_maybe(struct callback_head *cb)
* backing the user stack, tracing that reads the user stack will cause
* potentially infinite recursion.
*/
void noinstr do_machine_check(struct pt_regs *regs, long error_code)
void noinstr do_machine_check(struct pt_regs *regs)
{
DECLARE_BITMAP(valid_banks, MAX_NR_BANKS);
DECLARE_BITMAP(toclear, MAX_NR_BANKS);
@ -1366,7 +1366,7 @@ void noinstr do_machine_check(struct pt_regs *regs, long error_code)
current->mce_kill_me.func = kill_me_now;
task_work_add(current, &current->mce_kill_me, true);
} else {
if (!fixup_exception(regs, X86_TRAP_MC, error_code, 0))
if (!fixup_exception(regs, X86_TRAP_MC, 0, 0))
mce_panic("Failed kernel mode recovery", &m, msg);
}
}
@ -1895,27 +1895,32 @@ bool filter_mce(struct mce *m)
}
/* Handle unconfigured int18 (should never happen) */
static void unexpected_machine_check(struct pt_regs *regs, long error_code)
static void unexpected_machine_check(struct pt_regs *regs)
{
pr_err("CPU#%d: Unexpected int18 (Machine Check)\n",
smp_processor_id());
}
/* Call the installed machine check handler for this CPU setup. */
void (*machine_check_vector)(struct pt_regs *, long error_code) =
unexpected_machine_check;
void (*machine_check_vector)(struct pt_regs *) = unexpected_machine_check;
dotraplinkage noinstr void do_mce(struct pt_regs *regs, long error_code)
DEFINE_IDTENTRY_MCE(exc_machine_check)
{
if (machine_check_vector == do_machine_check &&
mce_check_crashing_cpu())
return;
nmi_enter();
if (user_mode(regs))
idtentry_enter(regs);
else
nmi_enter();
machine_check_vector(regs, error_code);
machine_check_vector(regs);
nmi_exit();
if (user_mode(regs))
idtentry_exit(regs);
else
nmi_exit();
}
/*

4
arch/x86/kernel/cpu/mce/inject.c
View File

@ -146,9 +146,9 @@ static void raise_exception(struct mce *m, struct pt_regs *pregs)
regs.cs = m->cs;
pregs = &regs;
}
/* in mcheck exeception handler, irq will be disabled */
/* do_machine_check() expects interrupts disabled -- at least */
local_irq_save(flags);
do_machine_check(pregs, 0);
do_machine_check(pregs);
local_irq_restore(flags);
m->finished = 0;
}

2
arch/x86/kernel/cpu/mce/internal.h
View File

@ -9,7 +9,7 @@
#include <asm/mce.h>
/* Pointer to the installed machine check handler for this CPU setup. */
extern void (*machine_check_vector)(struct pt_regs *, long error_code);
extern void (*machine_check_vector)(struct pt_regs *);
enum severity_level {
MCE_NO_SEVERITY,

2
arch/x86/kernel/cpu/mce/p5.c
View File

@ -21,7 +21,7 @@
int mce_p5_enabled __read_mostly;
/* Machine check handler for Pentium class Intel CPUs: */
static void pentium_machine_check(struct pt_regs *regs, long error_code)
static void pentium_machine_check(struct pt_regs *regs)
{
u32 loaddr, hi, lotype;

2
arch/x86/kernel/cpu/mce/winchip.c
View File

@ -17,7 +17,7 @@
#include "internal.h"
/* Machine check handler for WinChip C6: */
static void winchip_machine_check(struct pt_regs *regs, long error_code)
static void winchip_machine_check(struct pt_regs *regs)
{
pr_emerg("CPU0: Machine Check Exception.\n");
add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);

10
arch/x86/kernel/idt.c
View File

@ -96,7 +96,7 @@ static const __initconst struct idt_data def_idts[] = {
INTG(X86_TRAP_DB, debug),
#ifdef CONFIG_X86_MCE
INTG(X86_TRAP_MC, machine_check),
INTG(X86_TRAP_MC, asm_exc_machine_check),
#endif
SYSG(X86_TRAP_OF, asm_exc_overflow),
@ -185,11 +185,11 @@ gate_desc debug_idt_table[IDT_ENTRIES] __page_aligned_bss;
* cpu_init() when the TSS has been initialized.
*/
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_DF, double_fault, IST_INDEX_DF),
ISTG(X86_TRAP_DB, debug, IST_INDEX_DB),
ISTG(X86_TRAP_NMI, nmi, IST_INDEX_NMI),
ISTG(X86_TRAP_DF, double_fault, IST_INDEX_DF),
#ifdef CONFIG_X86_MCE
ISTG(X86_TRAP_MC, machine_check, IST_INDEX_MCE),
ISTG(X86_TRAP_MC, asm_exc_machine_check, IST_INDEX_MCE),
#endif
};

2
arch/x86/kvm/svm/svm.c
View File

@ -1837,7 +1837,7 @@ static void kvm_machine_check(void)
.flags = X86_EFLAGS_IF,
};
do_machine_check(&regs, 0);
do_machine_check(&regs);
#endif
}

2
arch/x86/kvm/vmx/vmx.c
View File

@ -4683,7 +4683,7 @@ static void kvm_machine_check(void)
.flags = X86_EFLAGS_IF,
};
do_machine_check(&regs, 0);
do_machine_check(&regs);
#endif
}

2
arch/x86/xen/enlighten_pv.c
View File

@ -613,7 +613,7 @@ static struct trap_array_entry trap_array[] = {
{ debug, xen_xendebug, true },
{ double_fault, xen_double_fault, true },
#ifdef CONFIG_X86_MCE
{ machine_check, xen_machine_check, true },
TRAP_ENTRY(exc_machine_check, true ),
#endif
{ nmi, xen_xennmi, true },
TRAP_ENTRY(exc_int3, false ),

2
arch/x86/xen/xen-asm_64.S
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@ -48,7 +48,7 @@ xen_pv_trap asm_exc_spurious_interrupt_bug
xen_pv_trap asm_exc_coprocessor_error
xen_pv_trap asm_exc_alignment_check
#ifdef CONFIG_X86_MCE
xen_pv_trap machine_check
xen_pv_trap asm_exc_machine_check
#endif /* CONFIG_X86_MCE */
xen_pv_trap asm_exc_simd_coprocessor_error
#ifdef CONFIG_IA32_EMULATION