[patch 09/12] libkvm: in-kernel ACPI pmtimer interface

[Marcelo Tosatti <mtosatti@redhat.com>]

[-- Attachment #1: inkernel-acpi-timer --]
[-- Type: text/plain, Size: 3295 bytes --]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm-userspace.realtip/libkvm/kvm-common.h
===================================================================
--- kvm-userspace.realtip.orig/libkvm/kvm-common.h
+++ kvm-userspace.realtip/libkvm/kvm-common.h
@@ -49,6 +49,10 @@ struct kvm_context {
 	int no_pit_creation;
 	/// in-kernel pit status
 	int pit_in_kernel;
+	// do not create in-kernel acpi timer if set
+	int no_acpi_timer_creation;
+	// in-kernel acpi timer status
+	int acpi_timer_in_kernel;
 };
 
 void init_slots(void);
Index: kvm-userspace.realtip/libkvm/libkvm-x86.c
===================================================================
--- kvm-userspace.realtip.orig/libkvm/libkvm-x86.c
+++ kvm-userspace.realtip/libkvm/libkvm-x86.c
@@ -166,6 +166,29 @@ int kvm_create_pit(kvm_context_t kvm)
 	return 0;
 }
 
+int kvm_create_acpi_timer(kvm_context_t kvm)
+{
+#ifdef KVM_CAP_ACPI_TIMER
+	int r;
+
+	kvm->acpi_timer_in_kernel = 0;
+	if (!kvm->no_acpi_timer_creation) {
+		r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_ACPI_TIMER);
+		if (r > 0) {
+	    		r = ioctl(kvm->vm_fd, KVM_CREATE_ACPI_TIMER);
+			if (r >= 0)
+				kvm->acpi_timer_in_kernel = 1;
+			else {
+				fprintf(stderr,
+					"Create kernel pmtimer failed\n");
+				return r;
+			}
+		}
+	}
+#endif
+	return 0;
+}
+
 int kvm_arch_create(kvm_context_t kvm, unsigned long phys_mem_bytes,
  			void **vm_mem)
 {
@@ -179,6 +202,10 @@ int kvm_arch_create(kvm_context_t kvm, u
 	if (r < 0)
 		return r;
 
+        r = kvm_create_acpi_timer(kvm);
+        if (r < 0)
+                return r;
+
 	return 0;
 }
 
Index: kvm-userspace.realtip/libkvm/libkvm.c
===================================================================
--- kvm-userspace.realtip.orig/libkvm/libkvm.c
+++ kvm-userspace.realtip/libkvm/libkvm.c
@@ -277,6 +277,11 @@ void kvm_disable_pit_creation(kvm_contex
 	kvm->no_pit_creation = 1;
 }
 
+void kvm_disable_acpi_timer_creation(kvm_context_t kvm)
+{
+	kvm->no_acpi_timer_creation = 1;
+}
+
 int kvm_create_vcpu(kvm_context_t kvm, int slot)
 {
 	long mmap_size;
@@ -994,3 +999,8 @@ int kvm_pit_in_kernel(kvm_context_t kvm)
 {
 	return kvm->pit_in_kernel;
 }
+
+int kvm_acpi_timer_in_kernel(kvm_context_t kvm)
+{
+	return kvm->acpi_timer_in_kernel;
+}
Index: kvm-userspace.realtip/libkvm/libkvm.h
===================================================================
--- kvm-userspace.realtip.orig/libkvm/libkvm.h
+++ kvm-userspace.realtip/libkvm/libkvm.h
@@ -117,6 +117,16 @@ void kvm_disable_irqchip_creation(kvm_co
 void kvm_disable_pit_creation(kvm_context_t kvm);
 
 /*!
+ * \brief Disable the in-kernel ACPI timer creation
+ *
+ * In-kernel acpi timer is enabled by default. If userspace acpi timer is to be used,
+ * this should be called prior to kvm_create().
+ *
+ *  \param kvm Pointer to the kvm_context
+ */
+void kvm_disable_acpi_timer_creation(kvm_context_t kvm);
+
+/*!
  * \brief Create new virtual machine
  *
  * This creates a new virtual machine, maps physical RAM to it, and creates a
@@ -599,6 +609,13 @@ int kvm_set_pit(kvm_context_t kvm, struc
 
 #endif
 
+/*!
+ * \brief Query whether in kernel acpi timer is used
+ *
+ *  \param kvm Pointer to the current kvm_context
+ */
+int kvm_acpi_timer_in_kernel(kvm_context_t kvm);
+
 #ifdef KVM_CAP_OPEN_IOPORT
 
 /*!

--