This series fixes a race condition that has been observed in testing on POWER9 machines running KVM guests. An interrupt being freed by free_irq() can have an instance present in a XIVE interrupt queue, which can then be presented to the generic interrupt code after the data structures for it have been freed, leading to a variety of crashes and hangs. This series is based on current upstream kernel source plus Cédric Le Goater's patch "KVM: PPC: Book3S HV: XIVE: Free escalation interrupts before disabling the VP", which is a pre-requisite for this series. As it touches both KVM and generic PPC code, this series will probably go in via Michael Ellerman's powerpc tree. V2 of this patch series adds a patch fixing a bug noticed by Cédric, and also fixes a bug in patch 1/2 of the v1 series. Paul. arch/powerpc/include/asm/xive.h | 8 +++ arch/powerpc/kvm/book3s_hv_rmhandlers.S | 38 +++++++++----- arch/powerpc/kvm/book3s_xive.c | 42 +++++++++++++++- arch/powerpc/kvm/book3s_xive.h | 2 + arch/powerpc/kvm/book3s_xive_native.c | 6 +++ arch/powerpc/sysdev/xive/common.c | 87 ++++++++++++++++++++++++--------- 6 files changed, 146 insertions(+), 37 deletions(-)
