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KVM: Add per-vm capability enablement.

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Allow KVM_ENABLE_CAP to act on a vm as well as on a vcpu. This makes more
sense when the caller wants to enable a vm-related capability.

s390 will be the first user; wire it up.

Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Cornelia Huck 2013-10-23 18:26:34 +02:00
parent 36c9549460
commit d938dc5522
3 changed files with 33 additions and 2 deletions
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6
Documentation/virtual/kvm/api.txt
View File

@ -932,9 +932,9 @@ documentation when it pops into existence).
4.37 KVM_ENABLE_CAP
Capability: KVM_CAP_ENABLE_CAP
Capability: KVM_CAP_ENABLE_CAP, KVM_CAP_ENABLE_CAP_VM
Architectures: ppc, s390
Type: vcpu ioctl
Type: vcpu ioctl, vm ioctl (with KVM_CAP_ENABLE_CAP_VM)
Parameters: struct kvm_enable_cap (in)
Returns: 0 on success; -1 on error
@ -965,6 +965,8 @@ function properly, this is the place to put them.
__u8 pad[64];
};
The vcpu ioctl should be used for vcpu-specific capabilities, the vm ioctl
for vm-wide capabilities.
4.38 KVM_GET_MP_STATE

24
arch/s390/kvm/kvm-s390.c
View File

@ -159,6 +159,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_S390_CSS_SUPPORT:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_ENABLE_CAP_VM:
r = 1;
break;
case KVM_CAP_NR_VCPUS:
@ -187,6 +188,21 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
return 0;
}
static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
{
int r;
if (cap->flags)
return -EINVAL;
switch (cap->cap) {
default:
r = -EINVAL;
break;
}
return r;
}
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@ -204,6 +220,14 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = kvm_s390_inject_vm(kvm, &s390int);
break;
}
case KVM_ENABLE_CAP: {
struct kvm_enable_cap cap;
r = -EFAULT;
if (copy_from_user(&cap, argp, sizeof(cap)))
break;
r = kvm_vm_ioctl_enable_cap(kvm, &cap);
break;
}
default:
r = -ENOTTY;
}

5
include/uapi/linux/kvm.h
View File

@ -741,6 +741,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_EXT_EMUL_CPUID 95
#define KVM_CAP_HYPERV_TIME 96
#define KVM_CAP_IOAPIC_POLARITY_IGNORED 97
#define KVM_CAP_ENABLE_CAP_VM 98
#ifdef KVM_CAP_IRQ_ROUTING
@ -1076,6 +1077,10 @@ struct kvm_s390_ucas_mapping {
/* Available with KVM_CAP_DEBUGREGS */
#define KVM_GET_DEBUGREGS _IOR(KVMIO, 0xa1, struct kvm_debugregs)
#define KVM_SET_DEBUGREGS _IOW(KVMIO, 0xa2, struct kvm_debugregs)
/*
* vcpu version available with KVM_ENABLE_CAP
* vm version available with KVM_CAP_ENABLE_CAP_VM
*/
#define KVM_ENABLE_CAP _IOW(KVMIO, 0xa3, struct kvm_enable_cap)
/* Available with KVM_CAP_XSAVE */
#define KVM_GET_XSAVE _IOR(KVMIO, 0xa4, struct kvm_xsave)