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[Xen-users] Re: [Xen-devel] Xen - Guest memory allocation

  • To: "dinesh chandrasekaran" <dinesh_chan8@xxxxxxxxxxx>
  • From: weiming <zephyr.zhao@xxxxxxxxx>
  • Date: Fri, 6 Jun 2008 15:12:49 -0400
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Fri, 06 Jun 2008 12:13:22 -0700
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I'm not very sure about your problem. Can the Hypervisor address the whole 5GB space? If yes, it can then allocate any of them to guests.

Or you can modify the "start info" passed to Guest OS. You can change the page_nr, a machine-PFN translation table to enable the guest to address the memory space that you want. It's weird.

On Fri, Jun 6, 2008 at 2:57 PM, dinesh chandrasekaran <dinesh_chan8@xxxxxxxxxxx> wrote:

        But if I want to add memory of type E820_USABLE to xen memory map during boot up (as per xen/e820.c) where the memory to be added lies behind a PCI device?

For ex,
If a PCI device reports it has 1GB of memory behind it.
And XEN has identified th RAM memory to be 4GB.

How can the PCI - 1GB can be added as usable memory to XEN's memory pool to get a cumulative size of 5GB;
Dinesh C

On Fri, Jun 6, 2008 at 3:00 PM, Weiming wrote:

AFAIK, In para virtualization, when guest boots, it reads the memory layout from a special page (start info page) instead of from bios.
If your guest os is a PV Linux, you can check its source code (e.g. start_kernel(), etc.)


On Fri, Jun 6, 2008 at 2:00 PM, dinesh chandrasekaran <dinesh_chan8@xxxxxxxxxxx> wrote:

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