• Mahesh Salgaonkar's avatar
    powerpc/book3s: Fix guest MC delivery mechanism to avoid soft lockups in guest. · 74845bc2
    Mahesh Salgaonkar authored
    Currently we forward MCEs to guest which have been recovered by guest.
    And for unhandled errors we do not deliver the MCE to guest. It looks like
    with no support of FWNMI in qemu, guest just panics whenever we deliver the
    recovered MCEs to guest. Also, the existig code used to return to host for
    unhandled errors which was casuing guest to hang with soft lockups inside
    guest and makes it difficult to recover guest instance.
    
    This patch now forwards all fatal MCEs to guest causing guest to crash/panic.
    And, for recovered errors we just go back to normal functioning of guest
    instead of returning to host. This fixes soft lockup issues in guest.
    This patch also fixes an issue where guest MCE events were not logged to
    host console.
    Signed-off-by: default avatarMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    74845bc2
book3s_hv_rmhandlers.S 58.7 KB