@@ -133,4 +133,30 @@ static inline void kvm_disable_steal_time(void)
}
#endif
+/* The bit of supported pv event */
+#define KVM_PV_FEATURE_PANICKED 0
+
+/* The pv event value */
+#define KVM_PV_EVENT_PANICKED 1
+
+static inline unsigned int kvm_arch_pv_features(void)
+{
+ return inl(KVM_PV_EVENT_PORT);
+}
+
+static inline unsigned int kvm_arch_pv_has_feature(unsigned int feature)
+{
+ if (kvm_arch_pv_features() & (1UL << feature))
+ return 1;
+ return 0;
+}
+
+static inline void kvm_arch_pv_send_event(unsigned int event)
+{
+ outl(event, KVM_PV_EVENT_PORT);
+}
+
+bool kvm_arch_pv_event_enabled(void);
+int kvm_arch_pv_event_init(void);
+
#endif /* _ASM_X86_KVM_PARA_H */
@@ -96,5 +96,7 @@ struct kvm_vcpu_pv_apf_data {
#define KVM_PV_EOI_ENABLED KVM_PV_EOI_MASK
#define KVM_PV_EOI_DISABLED 0x0
+#define KVM_PV_EVENT_PORT (0x505UL)
+
#endif /* _UAPI_ASM_X86_KVM_PARA_H */
@@ -80,7 +80,7 @@ obj-$(CONFIG_DEBUG_RODATA_TEST) += test_rodata.o
obj-$(CONFIG_DEBUG_NX_TEST) += test_nx.o
obj-$(CONFIG_DEBUG_NMI_SELFTEST) += nmi_selftest.o
-obj-$(CONFIG_KVM_GUEST) += kvm.o kvmclock.o
+obj-$(CONFIG_KVM_GUEST) += kvm.o kvmclock.o kvm_panic.o
obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_$(BITS).o
obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= paravirt-spinlocks.o
obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o
@@ -73,6 +73,20 @@ static int parse_no_kvmclock_vsyscall(char *arg)
early_param("no-kvmclock-vsyscall", parse_no_kvmclock_vsyscall);
+static int pv_event = 1;
+static int parse_no_pv_event(char *arg)
+{
+ pv_event = 0;
+ return 0;
+}
+
+bool kvm_arch_pv_event_enabled(void)
+{
+ return !!pv_event;
+}
+
+early_param("no-pv-event", parse_no_pv_event);
+
static DEFINE_PER_CPU(struct kvm_vcpu_pv_apf_data, apf_reason) __aligned(64);
static DEFINE_PER_CPU(struct kvm_steal_time, steal_time) __aligned(64);
static int has_steal_clock = 0;
@@ -386,6 +400,17 @@ 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_arch_pv_send_event(KVM_PV_EVENT_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;
@@ -463,6 +488,23 @@ static void __init kvm_apf_trap_init(void)
set_intr_gate(14, &async_page_fault);
}
+static void __init kvm_pv_panicked_event_init(void)
+{
+ if (kvm_arch_pv_has_feature(KVM_PV_FEATURE_PANICKED))
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &kvm_pv_panic_nb);
+}
+
+static void enable_pv_event(void)
+{
+ if (pv_event) {
+ if (kvm_arch_pv_event_init())
+ return;
+
+ kvm_pv_panicked_event_init();
+ }
+}
+
void __init kvm_guest_init(void)
{
int i;
@@ -494,6 +536,8 @@ void __init kvm_guest_init(void)
#else
kvm_guest_cpu_init();
#endif
+
+ enable_pv_event();
}
static bool __init kvm_detect(void)
new file mode 100644
@@ -0,0 +1,32 @@
+/*
+ * KVM panic notification implementation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright (C) 2013, Fujitsu, Inc.
+ * Authors: Wen Congyang <wency@cn.fujitsu.com>
+ * Authors: Hu Tao <hutao@cn.fujitsu.com>
+ */
+
+#include <uapi/asm/kvm_para.h>
+#include <linux/ioport.h>
+
+int kvm_arch_pv_event_init(void)
+{
+ if (!request_region(KVM_PV_EVENT_PORT, 4, "KVM_PV_EVENT"))
+ return -1;
+
+ return 0;
+}
@@ -23,6 +23,7 @@
#include <linux/init.h>
#include <linux/nmi.h>
#include <linux/dmi.h>
+#include <linux/kvm_para.h>
#define PANIC_TIMER_STEP 100
#define PANIC_BLINK_SPD 18
@@ -132,6 +133,9 @@ void panic(const char *fmt, ...)
if (!panic_blink)
panic_blink = no_blink;
+ if (kvm_arch_pv_event_enabled())
+ panic_timeout = 0;
+
if (panic_timeout > 0) {
/*
* Delay timeout seconds before rebooting the machine.