Re: [Qemu-devel] [PATCH] pc: memhotplug: rise minimum DIMM addr/size alignment to 128Mb

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Paolo Bonzini (pbonzini@redhat.com) wrote:
> 
> 
> On 23/09/2015 11:36, Igor Mammedov wrote:
> > Also it's QEMU bug/fault and pushing workaround to upper layers
> > doesn't seem right when it's much easier to do it in QEMU itself.
> 
> No, it's virtio's bug.  It makes sense to push workaround for guest bugs
> as far from the hypervisor as possible.

But you really don't want to have higher level things having to align
addresses themselves.  I could see adding an option for the required
alignment would be OK.

> If we want to increase the alignment in QEMU, I would prefer to have
> natural alignment which makes some sense and happens to work around the
> bug as well.  Michael, Eduardo, any third opinions?
> 

By natural alignment do you mean that an 'n MB' DIMM gets aligned to 'n MB' ?

Dave

> Paolo
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK