[PATCH v2 3/4] ARM/ARM64: KVM: Implement KVM_ARM_PREFERRED_TARGET ioctl
Anup Patel
anup.patel at linaro.org
Sat Sep 14 07:08:36 EDT 2013
For implementing CPU=host, we need a mechanism for querying
preferred VCPU target type on underlying Host.
This patch implements KVM_ARM_PREFERRED_TARGET ioctl which
return struct kvm_vcpu_init instance to user space for KVM ARM
and KVM ARM64 containing information about preferred VCPU
target type and optional VCPU features available for it.
Signed-off-by: Anup Patel <anup.patel at linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar at linaro.org>
---
arch/arm/kvm/arm.c | 12 ++++++++++++
include/uapi/linux/kvm.h | 1 +
2 files changed, 13 insertions(+)
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 9c697db..192212c 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -713,7 +713,19 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
return -EFAULT;
return kvm_vcpu_set_target(vcpu, &init);
+ }
+ case KVM_ARM_PREFERRED_TARGET: {
+ int err;
+ struct kvm_vcpu_init init;
+
+ err = kvm_vcpu_preferred_target(&init);
+ if (err)
+ return err;
+ if (copy_to_user(argp, &init, sizeof(init)))
+ return -EFAULT;
+
+ return 0;
}
case KVM_SET_ONE_REG:
case KVM_GET_ONE_REG: {
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 99c2533..e32e776 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1012,6 +1012,7 @@ struct kvm_s390_ucas_mapping {
/* VM is being stopped by host */
#define KVM_KVMCLOCK_CTRL _IO(KVMIO, 0xad)
#define KVM_ARM_VCPU_INIT _IOW(KVMIO, 0xae, struct kvm_vcpu_init)
+#define KVM_ARM_PREFERRED_TARGET _IOR(KVMIO, 0xaf, struct kvm_vcpu_init)
#define KVM_GET_REG_LIST _IOWR(KVMIO, 0xb0, struct kvm_reg_list)
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
--
1.7.9.5
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