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Subject[PATCH 1/2 v3] kvm: notify host when guest panicked
The implementation is the same as xen:
register panic notifier, and call hypercall when the guest
is paniced.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
arch/x86/kernel/kvm.c | 12 ++++++++++++
include/linux/kvm_para.h | 1 +
2 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index f0c6fd6..7f9afc5 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -331,6 +331,17 @@ static struct notifier_block kvm_pv_reboot_nb = {
.notifier_call = kvm_pv_reboot_notify,
};

+static int
+kvm_pv_panic_notify(struct notifier_block *nb, unsigned long code, void *unused)
+{
+ kvm_hypercall0(KVM_HC_GUEST_PANICKED);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block kvm_pv_panic_nb = {
+ .notifier_call = kvm_pv_panic_notify,
+};
+
static u64 kvm_steal_clock(int cpu)
{
u64 steal;
@@ -417,6 +428,7 @@ void __init kvm_guest_init(void)

paravirt_ops_setup();
register_reboot_notifier(&kvm_pv_reboot_nb);
+ atomic_notifier_chain_register(&panic_notifier_list, &kvm_pv_panic_nb);
for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++)
spin_lock_init(&async_pf_sleepers[i].lock);
if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF))
diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
index ff476dd..d030a22 100644
--- a/include/linux/kvm_para.h
+++ b/include/linux/kvm_para.h
@@ -19,6 +19,7 @@
#define KVM_HC_MMU_OP 2
#define KVM_HC_FEATURES 3
#define KVM_HC_PPC_MAP_MAGIC_PAGE 4
+#define KVM_HC_GUEST_PANICKED 5

/*
* hypercalls use architecture specific
--
1.7.1


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