Re: [Qemu-devel] Windows balloon driver PFN issue

[Peter Xu <peterx@redhat.com>]

On Thu, Feb 01, 2018 at 02:48:20PM +0200, Michael S. Tsirkin wrote:

[...]

> > > > > PFN is GPA>>12.  Do you have more than 1<<44 bytes of memory in this VM then?
> > > > 
> > > > No.  But isn't it still not good to drop the page at offset zero (and
> > > > drop it NNN times)?
> > > 
> > > Absolutely - looks like a bug. I just don't know why does this happen.
> > 
> > IMHO if we are using a PFN array like this:
> > 
> >    u64 pfn_array[];
> > 
> > In the windows guest driver, then we'll see this (as mentioned
> > above).  But for sure this is wild guess of mine.
> 
> I don't see code like this anywhere in the windows balloon
> driver. It's here:
> https://github.com/virtio-win/kvm-guest-drivers-windows.git

Thanks for the pointer.  I had a quick glance, the PFN array is
defined as:

    PPFN_NUMBER             pfns_table;

But I don't know what's sizeof(PPFN_NUMBER). :(

-- 
Peter Xu