From e0f0bbc527f6e9c0261f1d16b2a0b47612b7f235 Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Wed, 30 Oct 2013 11:02:30 -0600 Subject: kvm: Create non-coherent DMA registeration We currently use some ad-hoc arch variables tied to legacy KVM device assignment to manage emulation of instructions that depend on whether non-coherent DMA is present. Create an interface for this, adapting legacy KVM device assignment and adding VFIO via the KVM-VFIO device. For now we assume that non-coherent DMA is possible any time we have a VFIO group. Eventually an interface can be developed as part of the VFIO external user interface to query the coherency of a group. Signed-off-by: Alex Williamson Signed-off-by: Paolo Bonzini --- include/linux/kvm_host.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'include/linux') diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ed64880e4915..92aae88756db 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -670,6 +670,25 @@ static inline void kvm_arch_free_vm(struct kvm *kvm) } #endif +#ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA +void kvm_arch_register_noncoherent_dma(struct kvm *kvm); +void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm); +bool kvm_arch_has_noncoherent_dma(struct kvm *kvm); +#else +static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm) +{ +} + +static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm) +{ +} + +static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm) +{ + return false; +} +#endif + static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu) { #ifdef __KVM_HAVE_ARCH_WQP -- cgit v1.2.3