A number of machine check exceptions are triggerable by the guest. Ratelimit these to avoid a guest flooding the host console and logs. Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx> --- arch/powerpc/kvm/book3s_hv.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index e3b1839fc251..c94f9595133d 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -1328,8 +1328,12 @@ static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, r = RESUME_GUEST; break; case BOOK3S_INTERRUPT_MACHINE_CHECK: - /* Print the MCE event to host console. */ - machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); + /* + * Print the MCE event to host console. Ratelimit so the guest + * can't flood the host log. + */ + if (printk_ratelimit()) + machine_check_print_event_info(&vcpu->arch.mce_evt,false, true); /* * If the guest can do FWNMI, exit to userspace so it can @@ -1519,7 +1523,8 @@ static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) /* Pass the machine check to the L1 guest */ r = RESUME_HOST; /* Print the MCE event to host console. */ - machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); + if (printk_ratelimit()) + machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); break; /* * We get these next two if the guest accesses a page which it thinks -- 2.23.0
