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[Qemu-devel] Re: [kvm-devel] [PATCH 2/6] PCI DMA API

From: Avi Kivity
Subject: [Qemu-devel] Re: [kvm-devel] [PATCH 2/6] PCI DMA API
Date: Sun, 30 Mar 2008 13:25:30 +0300
User-agent: Thunderbird (X11/20080226)

Anthony Liguori wrote:
This patch introduces a PCI DMA API and some generic code to support other DMA
APIs.  Two types are introduced: PhysIOVector and IOVector.  A DMA API
maps a PhysIOVector, which is composed of target_phys_addr_t, into an IOVector,
which is composed of void *.

This enables zero-copy IO to be preformed without introducing assumptions of
phys_ram_base.  This API is at the PCI device level to enable support of
per-device IOMMU remapping.

+typedef struct IOVector
+    int num;
+    struct IOVectorElement {
+       void *base;
+       size_t len;
+    } sg[0];
+} IOVector;

Can we use 'struct iovec' for the element type (with accessors for setting base+len, and reading base or len, so we can substitute the Windows version for that platform)? That will allow using the vector without additional translation or casts.

error compiling committee.c: too many arguments to function

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