xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86/entry: Implement user mode C entry points for #DB and #MCE

Browse Source 
The MCE entry point uses the same mechanism as the IST entry point for
now. For #DB split the inner workings and just keep the nmi_enter/exit()
magic in the IST variant. Fixup the ASM code to emit the proper
noist_##cfunc call.

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/20200505135315.177564104@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-02-25 23:33:29 +01:00
parent f08e32ec3c
commit 4c0dcd8350
3 changed files with 94 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
arch/x86/kernel/cpu/mce/core.c
View File

@@ -1904,25 +1904,51 @@ static void unexpected_machine_check(struct pt_regs *regs)
/* Call the installed machine check handler for this CPU setup. */
void (*machine_check_vector)(struct pt_regs *) = unexpected_machine_check;
DEFINE_IDTENTRY_MCE(exc_machine_check)
static __always_inline void exc_machine_check_kernel(struct pt_regs *regs)
{
/*
* Only required when from kernel mode. See
* mce_check_crashing_cpu() for details.
*/
if (machine_check_vector == do_machine_check &&
mce_check_crashing_cpu())
return;
if (user_mode(regs))
idtentry_enter(regs);
else
nmi_enter();
nmi_enter();
machine_check_vector(regs);
if (user_mode(regs))
idtentry_exit(regs);
else
nmi_exit();
nmi_exit();
}
static __always_inline void exc_machine_check_user(struct pt_regs *regs)
{
idtentry_enter(regs);
machine_check_vector(regs);
idtentry_exit(regs);
}
#ifdef CONFIG_X86_64
/* MCE hit kernel mode */
DEFINE_IDTENTRY_MCE(exc_machine_check)
{
exc_machine_check_kernel(regs);
}
/* The user mode variant. */
DEFINE_IDTENTRY_MCE_USER(exc_machine_check)
{
exc_machine_check_user(regs);
}
#else
/* 32bit unified entry point */
DEFINE_IDTENTRY_MCE(exc_machine_check)
{
if (user_mode(regs))
exc_machine_check_user(regs);
else
exc_machine_check_kernel(regs);
}
#endif
/*
* Called for each booted CPU to set up machine checks.
* Must be called with preempt off: