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 <npig...@gmail.com>
---
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
