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Re: [kvm-devel] [Qemu-devel] Re: [PATCH 1/6] Use correct types to enable

From: Anthony Liguori
Subject: Re: [kvm-devel] [Qemu-devel] Re: [PATCH 1/6] Use correct types to enable > 2G support
Date: Fri, 01 Feb 2008 11:53:02 -0600
User-agent: Thunderbird (X11/20071229)

Ian Jackson wrote:
Anthony Liguori writes ("[Qemu-devel] Re: [kvm-devel] [PATCH 1/6] Use correct types to 
enable > 2G support"):
The alternative is to change all the places that assume phys_ram_base + PA which I don't like very much.

We would ideally like to do this for Xen, at least in the places we
care about.  (Xen uses less of the qemu tree than KVM, I think.)

Support for the map cache in the Xen tree is a rather big change that I'm not going to attempt to support it in this patch series.

I'd rather preserve the phys_ram_base + PA assumption because it allows us to be able to do support > 1 page DMA operations for our virtual IO drivers. If you break the assumption that physically contiguous memory in the guest is virtual contiguous memory in the host, things get pretty ugly.


Anthony Liguori

In Xen, the guest memory is not in general mapped into the host qemu's
address space.


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