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Re: [Qemu-devel] Windows balloon driver PFN issue
From: |
Peter Xu |
Subject: |
Re: [Qemu-devel] Windows balloon driver PFN issue |
Date: |
Fri, 2 Feb 2018 18:11:40 +0800 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
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