Re: [kvm-devel] [PATCH 4/8] KVM: PVDMA: Introduce is_pv_device() dma operation

[Muli Ben-Yehuda]

On Wed, Nov 07, 2007 at 04:21:05PM +0200, Amit Shah wrote:

> A guest can call dma_ops->is_pv_device() to find out if a device is
> a passthrough'ed device (device passed on to a guest by the
> host). If this is true, a hypercall will be made to translate DMA
> mapping operations.

Doesn't really belong in the DMA mapping API. Instead what I think we
should do is to cache this (per device) value in the pci_device struct
(or device struct?) and in the dma-ops implementation inspect it to
decide exactly how to do DMA mapping for this device.

Cheers,
Muli
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