Messages in this thread | | | From | Amit Shah <> | Subject | Re: [kvm-devel] [PATCH 1/8] KVM: PVDMA Host: Handle reqeusts for guest DMA mappings | Date | Mon, 12 Nov 2007 22:37:29 +0530 |
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On Monday 12 November 2007 21:25:22 Joerg Roedel wrote: > On Wed, Nov 07, 2007 at 04:21:02PM +0200, Amit Shah wrote: > > @@ -1649,6 +1913,15 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) > > } > > > > switch (nr) { > > + case KVM_PV_DMA_MAP: > > + ret = pv_map_hypercall(vcpu, a0, a1); > > + break; > > + case KVM_PV_DMA_UNMAP: > > + ret = pv_unmap_hypercall(vcpu, a0); > > + break; > > + case KVM_PV_PCI_DEVICE: > > + ret = pv_mapped_pci_device_hypercall(vcpu, a0); > > + break; > > default: > > ret = -KVM_ENOSYS; > > break; > > How does synchronization work with that design? I don't see a hypercall > to synchronize de DMA buffers. It will only work if GART is used as the > dma_ops backend on the host side and not with SWIOTLB. But GART can be > configured away. Or do I miss something?
A per-VM lock is needed while mapping or unmapping. It's one of the TODOs. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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