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:pbonz...@redhat.com] > Sent: 14 November 2012 16:36 > To: Thanos Makatos > Cc: Stefano Stabellini; Charles Arnold; qemu-devel@nongnu.org; Kevin > Wolf; stefa...@redhat.com; xen-de...@lists.xensource.com > 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
