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x86/entry: Convert SIMD coprocessor error exception to IDTENTRY

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Convert #XF to IDTENTRY_ERRORCODE:
  - Implement the C entry point with DEFINE_IDTENTRY
  - Emit the ASM stub with DECLARE_IDTENTRY
  - Handle INVD_BUG in C
  - 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 RCU warning as the new entry macro ensures correctness

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/20200505134906.021552202@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-25 23:16:29 +01:00
parent 436608bb00
commit 48227e21f7
8 changed files with 21 additions and 33 deletions
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14
arch/x86/entry/entry_32.S
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@ -1290,20 +1290,6 @@ SYM_FUNC_END(name)
/* The include is where all of the SMP etc. interrupts come from */
#include <asm/entry_arch.h>
SYM_CODE_START(simd_coprocessor_error)
ASM_CLAC
pushl $0
#ifdef CONFIG_X86_INVD_BUG
/* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */
ALTERNATIVE "pushl $exc_general_protection", \
"pushl $do_simd_coprocessor_error", \
X86_FEATURE_XMM
#else
pushl $do_simd_coprocessor_error
#endif
jmp common_exception
SYM_CODE_END(simd_coprocessor_error)
#ifdef CONFIG_PARAVIRT
SYM_CODE_START(native_iret)
iret

1
arch/x86/entry/entry_64.S
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@ -1073,7 +1073,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
*/
idtentry X86_TRAP_BP int3 do_int3 has_error_code=0
idtentry X86_TRAP_XF simd_coprocessor_error do_simd_coprocessor_error has_error_code=0
idtentry X86_TRAP_PF page_fault do_page_fault has_error_code=1

1
arch/x86/include/asm/idtentry.h
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@ -131,6 +131,7 @@ DECLARE_IDTENTRY(X86_TRAP_NM, exc_device_not_available);
DECLARE_IDTENTRY(X86_TRAP_OLD_MF, exc_coproc_segment_overrun);
DECLARE_IDTENTRY(X86_TRAP_SPURIOUS, exc_spurious_interrupt_bug);
DECLARE_IDTENTRY(X86_TRAP_MF, exc_coprocessor_error);
DECLARE_IDTENTRY(X86_TRAP_XF, exc_simd_coprocessor_error);
/* Simple exception entries with error code pushed by hardware */
DECLARE_IDTENTRY_ERRORCODE(X86_TRAP_TS, exc_invalid_tss);

3
arch/x86/include/asm/traps.h
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@ -22,7 +22,6 @@ asmlinkage void async_page_fault(void);
#ifdef CONFIG_X86_MCE
asmlinkage void machine_check(void);
#endif /* CONFIG_X86_MCE */
asmlinkage void simd_coprocessor_error(void);
#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
asmlinkage void xen_xennmi(void);
@ -33,7 +32,6 @@ asmlinkage void xen_page_fault(void);
#ifdef CONFIG_X86_MCE
asmlinkage void xen_machine_check(void);
#endif /* CONFIG_X86_MCE */
asmlinkage void xen_simd_coprocessor_error(void);
#endif
dotraplinkage void do_debug(struct pt_regs *regs, long error_code);
@ -41,7 +39,6 @@ dotraplinkage void do_nmi(struct pt_regs *regs, long error_code);
dotraplinkage void do_int3(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_simd_coprocessor_error(struct pt_regs *regs, long error_code);
#ifdef CONFIG_X86_32
dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code);
#endif

2
arch/x86/kernel/idt.c
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@ -86,7 +86,7 @@ static const __initconst struct idt_data def_idts[] = {
INTG(X86_TRAP_SPURIOUS, asm_exc_spurious_interrupt_bug),
INTG(X86_TRAP_MF, asm_exc_coprocessor_error),
INTG(X86_TRAP_AC, asm_exc_alignment_check),
INTG(X86_TRAP_XF, simd_coprocessor_error),
INTG(X86_TRAP_XF, asm_exc_simd_coprocessor_error),
#ifdef CONFIG_X86_32
TSKG(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS),

29
arch/x86/kernel/traps.c
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@ -810,7 +810,7 @@ NOKPROBE_SYMBOL(do_debug);
* the correct behaviour even in the presence of the asynchronous
* IRQ13 behaviour
*/
static void math_error(struct pt_regs *regs, int error_code, int trapnr)
static void math_error(struct pt_regs *regs, int trapnr)
{
struct task_struct *task = current;
struct fpu *fpu = &task->thread.fpu;
@ -821,15 +821,15 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr)
cond_local_irq_enable(regs);
if (!user_mode(regs)) {
if (fixup_exception(regs, trapnr, error_code, 0))
if (fixup_exception(regs, trapnr, 0, 0))
goto exit;
task->thread.error_code = error_code;
task->thread.error_code = 0;
task->thread.trap_nr = trapnr;
if (notify_die(DIE_TRAP, str, regs, error_code,
trapnr, SIGFPE) != NOTIFY_STOP)
die(str, regs, error_code);
if (notify_die(DIE_TRAP, str, regs, 0, trapnr,
SIGFPE) != NOTIFY_STOP)
die(str, regs, 0);
goto exit;
}
@ -839,7 +839,7 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr)
fpu__save(fpu);
task->thread.trap_nr = trapnr;
task->thread.error_code = error_code;
task->thread.error_code = 0;
si_code = fpu__exception_code(fpu, trapnr);
/* Retry when we get spurious exceptions: */
@ -854,14 +854,19 @@ exit:
DEFINE_IDTENTRY(exc_coprocessor_error)
{
math_error(regs, 0, X86_TRAP_MF);
math_error(regs, X86_TRAP_MF);
}
dotraplinkage void
do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
DEFINE_IDTENTRY(exc_simd_coprocessor_error)
{
RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
math_error(regs, error_code, X86_TRAP_XF);
if (IS_ENABLED(CONFIG_X86_INVD_BUG)) {
/* AMD 486 bug: INVD in CPL 0 raises #XF instead of #GP */
if (!static_cpu_has(X86_FEATURE_XMM)) {
__exc_general_protection(regs, 0);
return;
}
}
math_error(regs, X86_TRAP_XF);
}
DEFINE_IDTENTRY(exc_spurious_interrupt_bug)

2
arch/x86/xen/enlighten_pv.c
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@ -634,7 +634,7 @@ static struct trap_array_entry trap_array[] = {
TRAP_ENTRY(exc_spurious_interrupt_bug, false ),
TRAP_ENTRY(exc_coprocessor_error, false ),
TRAP_ENTRY(exc_alignment_check, false ),
{ simd_coprocessor_error, xen_simd_coprocessor_error, false },
TRAP_ENTRY(exc_simd_coprocessor_error, false ),
};
static bool __ref get_trap_addr(void **addr, unsigned int ist)

2
arch/x86/xen/xen-asm_64.S
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@ -50,7 +50,7 @@ xen_pv_trap asm_exc_alignment_check
#ifdef CONFIG_X86_MCE
xen_pv_trap machine_check
#endif /* CONFIG_X86_MCE */
xen_pv_trap simd_coprocessor_error
xen_pv_trap asm_exc_simd_coprocessor_error
#ifdef CONFIG_IA32_EMULATION
xen_pv_trap entry_INT80_compat
#endif