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Re: [Xen-users] DomU max 32GB memory

To: bastian@xxxxxxxxxxxx
Subject: Re: [Xen-users] DomU max 32GB memory
From: Nathan March <nathan@xxxxxx>
Date: Mon, 18 Jul 2011 16:16:12 -0700
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On 7/18/2011 4:03 PM, Nathan March wrote:
> Can you elaborate more please? I've run into this issue as well, on
> fairly modern dom0 / domU kernels. Xentop / xm list  show 48gb but the
> domu only shows 32gb.
> Can you provide any specifics on when/where this was changed?
> - Nathan

Finally found it, if anyone else is looking for it. In the domu kernel:

  | The pseudo-physical to machine address array is sized
  | according to the maximum possible memory size of a Xen
  | domain.  This array uses 1 page per gigabyte, so there's no
  | need to be too stingy here.
  | Symbol: XEN_MAX_DOMAIN_MEMORY [=32]
  | Prompt: Maximum allowed size of a domain in gigabytes
  |   Defined at arch/x86/xen/Kconfig:16
  |   Depends on: PARAVIRT_GUEST [=y] && XEN [=y]
  |   Location:
  |     -> Processor type and features
  |       -> Paravirtualized guest support (PARAVIRT_GUEST [=y])| 
  |         -> Xen guest support (XEN [=y])

- Nathan

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