Now that we have a flag that will tell the guest it was suspended, create an
interface for that communication using a KVM ioctl.
Signed-off-by: Eric B Munson <emunson@xxxxxxxxx>
---
Changes from V1:
Add kvm_set_host_stopped to arch/x86/jvm/x86.c instead of kvmclock.c
Rename KVM_PAUSE_GUEST to KVM_GUEST_PAUSED
arch/x86/include/asm/pvclock.h | 3 +++
arch/x86/kvm/x86.c | 16 ++++++++++++++++
include/linux/kvm.h | 2 ++
3 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h
index 7d3ba41..9312814 100644
--- a/arch/x86/include/asm/pvclock.h
+++ b/arch/x86/include/asm/pvclock.h
@@ -3,6 +3,7 @@
#include <linux/clocksource.h>
#include <asm/pvclock-abi.h>
+#include <linux/kvm_host.h>
/* some helper functions for xen and kvm pv clock sources */
cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);
@@ -13,6 +14,8 @@ void pvclock_read_wallclock(struct pvclock_wall_clock *wall,
struct timespec *ts);
void pvclock_resume(void);
+void kvm_set_host_stopped(struct kvm_vcpu *vcpu);
+
bool kvm_check_and_clear_host_stopped(int cpu);
/*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c38efd7..592ac3b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3295,6 +3295,11 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
goto out;
}
+ case KVM_GUEST_PAUSED: {
+ r = 0;
+ kvm_set_host_stopped(vcpu);
+ break;
+ }
default:
r = -EINVAL;
}
@@ -6117,6 +6122,17 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
}
EXPORT_SYMBOL_GPL(kvm_task_switch);
+/*
+ * kvm_set_host_stopped() indicates to the guest kernel that it has been
+ * stopped by the hypervisor. This function will be called from the host only.
+ */
+void kvm_set_host_stopped(struct kvm_vcpu *vcpu)
+{
+ struct pvclock_vcpu_time_info *src = &vcpu->arch.hv_clock;
+ src->flags |= PVCLOCK_GUEST_STOPPED;
+}
+EXPORT_SYMBOL_GPL(kvm_set_host_stopped);
+
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index f47fcd3..87cab0d 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -763,6 +763,8 @@ struct kvm_clock_data {
#define KVM_CREATE_SPAPR_TCE _IOW(KVMIO, 0xa8, struct kvm_create_spapr_tce)
/* Available with KVM_CAP_RMA */
#define KVM_ALLOCATE_RMA _IOR(KVMIO, 0xa9, struct kvm_allocate_rma)
+/* VM is being stopped by host */
+#define KVM_GUEST_PAUSED _IO(KVMIO, 0xaa)
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
--
1.7.5.4
--
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