Re: [Qemu-devel] [PATCH] block: vpc support for ~2 TB disks

[Thanos Makatos]

I'm not sure I understand your question. In XenServer blktap2 we set CHS to 
65535*16*255 in the VHD metadata for disks larger than 127GB. We don't really 
care about these values, we just store them in the VHD metadata.

> -----Original Message-----
> From: Paolo Bonzini [mailto:address@hidden
> Sent: 14 November 2012 16:36
> To: Thanos Makatos
> Cc: Stefano Stabellini; Charles Arnold; address@hidden; Kevin
> Wolf; address@hidden; address@hidden
> Subject: Re: [PATCH] block: vpc support for ~2 TB disks
> 
> Il 14/11/2012 17:25, Thanos Makatos ha scritto:
> > We don't use qemu's VHD driver in XenServer. Instead, we use blktap2
> > to create a block device in dom0 serving the VHD file in question,
> and
> > have qemu open that block device instead of the VHD file itself.
> 
> Yes, the question is how you handle disks bigger than 127GB, so that
> QEMU can do the same.
> 
> Paolo