[PATCH 3/4 V10] Add ioctl for KVMCLOCK_GUEST_STOPPED

[Eric B Munson <emunson@mgebm.net>]

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@mgebm.net>

Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: ryanh@linux.vnet.ibm.com
Cc: aliguori@us.ibm.com
Cc: mtosatti@redhat.com
Cc: jeremy.fitzhardinge@citrix.com
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
---
Changes from V9:
 Use kvm_for_each_vcpu to iterate online vcpu's

Changes from V8:
 Make KVM_GUEST_PAUSED a per vm ioctl instead of per vcpu

Changes from V7:
 Define KVM_CAP_GUEST_PAUSED and support check
 Call mark_page_dirty () after setting PVCLOCK_GUEST_STOPPED

Changes from V4:
 Rename KVM_GUEST_PAUSED to KVMCLOCK_GUEST_PAUSED
 Add new ioctl description to api.txt

 Documentation/virtual/kvm/api.txt |   13 +++++++++++++
 arch/x86/kvm/x86.c                |   25 +++++++++++++++++++++++++
 include/linux/kvm.h               |    3 +++
 3 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index e1d94bf..1931e5c 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1491,6 +1491,19 @@ following algorithm:
 Some guests configure the LINT1 NMI input to cause a panic, aiding in
 debugging.
 
+4.65 KVMCLOCK_GUEST_PAUSED
+
+Capability: KVM_CAP_GUEST_PAUSED
+Architechtures: Any that implement pvclocks (currently x86 only)
+Type: vcpu ioctl
+Parameters: None
+Returns: 0 on success, -1 on error
+
+This signals to the host kernel that the specified guest is being paused by
+userspace.  The host will set a flag in the pvclock structure that is checked
+from the soft lockup watchdog.  This ioctl can be called during pause or
+unpause.
+
 5. The kvm_run structure
 
 Application code obtains a pointer to the kvm_run structure by
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 14d6cad..1341e3b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2056,6 +2056,7 @@ int kvm_dev_ioctl_check_extension(long ext)
 	case KVM_CAP_X86_ROBUST_SINGLESTEP:
 	case KVM_CAP_XSAVE:
 	case KVM_CAP_ASYNC_PF:
+	case KVM_CAP_GUEST_PAUSED:
 	case KVM_CAP_GET_TSC_KHZ:
 		r = 1;
 		break;
@@ -3061,6 +3062,26 @@ out:
 	return r;
 }
 
+/*
+ * kvm_set_guest_paused() indicates to the guest kernel that it has been
+ * stopped by the hypervisor.  This function will be called from the host only.
+ */
+static int kvm_set_guest_paused(struct kvm *kvm)
+{
+	struct kvm_vcpu *vcpu;
+	struct pvclock_vcpu_time_info *src;
+	int i;
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (!vcpu->arch.time_page)
+			continue;
+		src = &vcpu->arch.hv_clock;
+		src->flags |= PVCLOCK_GUEST_STOPPED;
+		mark_page_dirty(vcpu->kvm, vcpu->arch.time >> PAGE_SHIFT);
+	}
+	return 0;
+}
+
 long kvm_arch_vm_ioctl(struct file *filp,
 		       unsigned int ioctl, unsigned long arg)
 {
@@ -3351,6 +3372,10 @@ long kvm_arch_vm_ioctl(struct file *filp,
 		r = 0;
 		break;
 	}
+	case KVMCLOCK_GUEST_PAUSED: {
+		r = kvm_set_guest_paused(kvm);
+		break;
+	}
 
 	default:
 		;
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 68e67e5..4ffe0df 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -558,6 +558,7 @@ struct kvm_ppc_pvinfo {
 #define KVM_CAP_PPC_PAPR 68
 #define KVM_CAP_S390_GMAP 71
 #define KVM_CAP_TSC_DEADLINE_TIMER 72
+#define KVM_CAP_GUEST_PAUSED 73
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -763,6 +764,8 @@ 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 KVMCLOCK_GUEST_PAUSED	  _IO(KVMIO,   0xaa)
 
 #define KVM_DEV_ASSIGN_ENABLE_IOMMU	(1 << 0)
 
-- 
1.7.5.4