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xen-devel
Re: [Xen-devel] Can I specify a physical memory region for a domU
At 17:47 -0700 on 07 Sep (1315417666), Eric Camachat wrote:
> Hi,
>
> I am porting our drivers to XEN's PV domU (with PV PCI passthrouth), I
> have to allocate a memory block and tell the hardware to access it.
> But the hardware can address 32-bit only, so I want dedicate a region
> of memory that below 2GB for the domU only.
> How do that in XEN?
Use the XENMEM_echange memory_op hypercall. You can specify a bit-width
for the pages you want returned.
Of course, on a full Xen host there may be no 32-bit-clean memory left.
Xen tries to allocate the higher addresses first to avoid that, but
there's no guarantee.
Tim.
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