diff options
Diffstat (limited to 'arch/powerpc/kernel/mce.c')
| -rw-r--r-- | arch/powerpc/kernel/mce.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index 9b2ea7e71c06..f588951b171d 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -470,6 +470,34 @@ long hmi_exception_realmode(struct pt_regs *regs) { __this_cpu_inc(irq_stat.hmi_exceptions); +#ifdef CONFIG_PPC_BOOK3S_64 + /* Workaround for P9 vector CI loads (see p9_hmi_special_emu) */ + if (pvr_version_is(PVR_POWER9)) { + unsigned long hmer = mfspr(SPRN_HMER); + + /* Do we have the debug bit set */ + if (hmer & PPC_BIT(17)) { + hmer &= ~PPC_BIT(17); + mtspr(SPRN_HMER, hmer); + + /* + * Now to avoid problems with soft-disable we + * only do the emulation if we are coming from + * user space + */ + if (user_mode(regs)) + local_paca->hmi_p9_special_emu = 1; + + /* + * Don't bother going to OPAL if that's the + * only relevant bit. + */ + if (!(hmer & mfspr(SPRN_HMEER))) + return local_paca->hmi_p9_special_emu; + } + } +#endif /* CONFIG_PPC_BOOK3S_64 */ + wait_for_subcore_guest_exit(); if (ppc_md.hmi_exception_early) @@ -477,5 +505,5 @@ long hmi_exception_realmode(struct pt_regs *regs) wait_for_tb_resync(); - return 0; + return 1; } |
