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Re: [Xen-devel] [PATCH v3 3/4] pc & q35: Add new object pc-memory-layout.



Il 24/03/2014 19:55, Don Slutz ha scritto:
This new object has the property max-ram-below-4g.

If you add enough PCI devices then all mmio for them will not fit
below 4G which may not be the layout the user wanted. This allows
you to increase the below 4G address space that PCI devices can use
(aka decrease ram below 4G) and therefore in more cases not have any
mmio that is above 4G.

For example adding "-global pc-memory-layout.max-ram-below-4g=2G" to
the command line will limit the amount of ram that is below 4G to
2G.

Does Xen's firmware allow 64-bit BARs? I'm wondering why this is not a problem on KVM.

Also, overloading -global like this isn't the best long term choice. We should get custom -machine properties in 2.1, we should use them.

Paolo

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