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kvm: Allow build-time configuration of KVM device assignment

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We hope to at some point deprecate KVM legacy device assignment in
favor of VFIO-based assignment.  Towards that end, allow legacy
device assignment to be deconfigured.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Alex Williamson 2013-04-16 13:49:18 -06:00 • committed by Gleb Natapov
parent 064d1afaa5
commit 2a5bab1004
10 changed files with 40 additions and 41 deletions
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30
include/linux/kvm_host.h
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@ -667,7 +667,6 @@ static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
void kvm_arch_destroy_vm(struct kvm *kvm);
void kvm_free_all_assigned_devices(struct kvm *kvm);
void kvm_arch_sync_events(struct kvm *kvm);
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
@ -736,7 +735,7 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
/* For vcpu->arch.iommu_flags */
#define KVM_IOMMU_CACHE_COHERENCY 0x1
#ifdef CONFIG_IOMMU_API
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
int kvm_iommu_map_guest(struct kvm *kvm);
@ -745,7 +744,7 @@ int kvm_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev);
int kvm_deassign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev);
#else /* CONFIG_IOMMU_API */
#else
static inline int kvm_iommu_map_pages(struct kvm *kvm,
struct kvm_memory_slot *slot)
{
@ -757,28 +756,11 @@ static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
{
}
static inline int kvm_iommu_map_guest(struct kvm *kvm)
{
return -ENODEV;
}
static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
{
return 0;
}
static inline int kvm_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
return 0;
}
static inline int kvm_deassign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
return 0;
}
#endif /* CONFIG_IOMMU_API */
#endif
static inline void __guest_enter(void)
{
@ -1032,11 +1014,13 @@ static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
#endif
#ifdef __KVM_HAVE_DEVICE_ASSIGNMENT
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
unsigned long arg);
void kvm_free_all_assigned_devices(struct kvm *kvm);
#else
static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
@ -1045,6 +1029,8 @@ static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
return -ENOTTY;
}
static inline void kvm_free_all_assigned_devices(struct kvm *kvm) {}
#endif
static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)