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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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