linux-kernel - [PATCH 5/5] Add an ioctl to communicate the consign limit to the host.

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Date:	Mon, 26 Nov 2012 14:37:17 -0600
From:	Michael Wolf <mjw@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	riel@...hat.com, kvm@...r.kernel.org, peterz@...radead.org,
	mtosatti@...hat.com, glommer@...allels.com, mingo@...hat.com
Subject: [PATCH 5/5] Add an ioctl to communicate the consign limit to the
 host.

Add an ioctl to communicate the consign limit to the host.

Signed-off-by: Michael Wolf <mjw@...ux.vnet.ibm.com>
---
 arch/x86/kvm/x86.c       |    6 ++++++
 include/linux/kvm_host.h |    2 ++
 include/uapi/linux/kvm.h |    2 ++
 virt/kvm/kvm_main.c      |    7 +++++++
 4 files changed, 17 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c91f4c9..5d57469 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5938,6 +5938,12 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
+int kvm_arch_vcpu_ioctl_set_entitlement(struct kvm_vcpu *vcpu, long entitlement)
+{
+	vcpu->arch.consigned_limit = entitlement;
+	return 0;
+}
+
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 {
 	struct i387_fxsave_struct *fxsave =
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0e2212f..de13648 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -590,6 +590,8 @@ void kvm_arch_hardware_unsetup(void);
 void kvm_arch_check_processor_compat(void *rtn);
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
+int kvm_arch_vcpu_ioctl_set_entitlement(struct kvm_vcpu *vcpu,
+					long entitlement);
 
 void kvm_free_physmem(struct kvm *kvm);
 
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 0a6d6ba..86f24bb 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -921,6 +921,8 @@ struct kvm_s390_ucas_mapping {
 #define KVM_SET_ONE_REG		  _IOW(KVMIO,  0xac, struct kvm_one_reg)
 /* VM is being stopped by host */
 #define KVM_KVMCLOCK_CTRL	  _IO(KVMIO,   0xad)
+/* Set the consignment limit which will be used to separete steal time */
+#define KVM_SET_ENTITLEMENT	  _IOW(KVMIO, 0xae, unsigned long)
 
 #define KVM_DEV_ASSIGN_ENABLE_IOMMU	(1 << 0)
 #define KVM_DEV_ASSIGN_PCI_2_3		(1 << 1)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index be70035..c712fe5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2062,6 +2062,13 @@ out_free2:
 		r = 0;
 		break;
 	}
+	case KVM_SET_ENTITLEMENT: {
+		r = kvm_arch_vcpu_ioctl_set_entitlement(vcpu, arg);
+		if (r)
+			goto out;
+		r = 0;
+		break;
+	}
 	default:
 		r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
 	}

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