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x86/xen: Use specific Xen pv interrupt entry for MCE

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Xen PV guests don't use IST. For machine check interrupts, switch to the
same model as debug interrupts.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210120135555.32594-3-jgross@suse.com
This commit is contained in:
Juergen Gross 2021-01-20 14:55:42 +01:00 committed by Borislav Petkov
parent 92bf22614b
commit c3d7fa6684
3 changed files with 19 additions and 2 deletions
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3
arch/x86/include/asm/idtentry.h
View file

@ -585,6 +585,9 @@ DECLARE_IDTENTRY_MCE(X86_TRAP_MC, exc_machine_check);
#else
DECLARE_IDTENTRY_RAW(X86_TRAP_MC, exc_machine_check);
#endif
#ifdef CONFIG_XEN_PV
DECLARE_IDTENTRY_RAW(X86_TRAP_MC, xenpv_exc_machine_check);
#endif
#endif
/* NMI */

16
arch/x86/xen/enlighten_pv.c
View file

@ -590,6 +590,20 @@ DEFINE_IDTENTRY_RAW(exc_xen_unknown_trap)
BUG();
}
#ifdef CONFIG_X86_MCE
DEFINE_IDTENTRY_RAW(xenpv_exc_machine_check)
{
/*
* There's no IST on Xen PV, but we still need to dispatch
* to the correct handler.
*/
if (user_mode(regs))
noist_exc_machine_check(regs);
else
exc_machine_check(regs);
}
#endif
struct trap_array_entry {
void (*orig)(void);
void (*xen)(void);
@ -610,7 +624,7 @@ static struct trap_array_entry trap_array[] = {
TRAP_ENTRY_REDIR(exc_debug, true ),
TRAP_ENTRY(exc_double_fault, true ),
#ifdef CONFIG_X86_MCE
TRAP_ENTRY(exc_machine_check, true ),
TRAP_ENTRY_REDIR(exc_machine_check, true ),
#endif
TRAP_ENTRY_REDIR(exc_nmi, true ),
TRAP_ENTRY(exc_int3, false ),

2
arch/x86/xen/xen-asm.S
View file

@ -172,7 +172,7 @@ 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 asm_exc_machine_check
xen_pv_trap asm_xenpv_exc_machine_check
#endif /* CONFIG_X86_MCE */
xen_pv_trap asm_exc_simd_coprocessor_error
#ifdef CONFIG_IA32_EMULATION