Anthony Liguori wrote:
So one gotcha about using a BAR is that we emulate a 32-bit PCI device so that limits where the BAR can live in memory and how large it can be.
We can overcome that by emulating a 64-bit device...
I think bars also have to be powers of two in size.
I think that's right; but the device can define the the range [0, X) as shared RAM and the range [X, 2^n) as undefined. So long as it makes X available in the config space.
Besides, computer people have trouble imagining numbers which are not powers of two.
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