On Wed, Jun 25, 2014 at 09:52:09PM +0000, Damjan Marion (damarion) wrote:
>
> On 25 Jun 2014, at 18:44, Paolo Bonzini <pbonz...@redhat.com> wrote:
>
> >> nregions: 4
> >> region:
> >> gpa = 0x100000000
> >> size = 3221225472
> >> ua = 0x2aab6ac00000
> >
> > High memory, above 3 gigabytes.
> >
> >> region:
> >> gpa = 0xFFFC0000
> >> size = 262144
> >> ua = 0x7fc13d200000
> >
> > This is the BIOS. There shouldn't be any FD for this one, it
> > is not allocated in hugetlbfs.
> >
> >> region:
> >> gpa = 0x0
> >> size = 655360
> >> ua = 0x2aaaaac00000
> >> region:
> >> gpa = 0xC0000
> >> size = 3220439040
> >> ua = 0x2aaaaacc0000
> >
> > Together, it's the first 3 GB of memory.
> >
> > I understand now what you mean. Yeah, the format should be changed
> > to include the offset (why does vhost-user need the ua at all?
> > perhaps the offset can replace the ua).
> >
> >> BTW Any idea what to do with region 2, it doesn’t look like the one
> >> belonging
> >> to the same place, but qemu_get_ram_fd() returns same FD for it.
> >
> > This must be a bug. I would have expected qemu_get_ram_fd to return -1
> > here, so no descriptor should be passed to vhost-user.
>
> Problem is inside qemu_get_ram_block():
>
>
> if (block && addr - block->offset < block->length) {
> goto found;
> }
>
> this is true if we have > 4G of RAM allocated.
Hmm I don't get it. Why is it always true for >4G RAM?
>
> Any advice how to fix this?
>
>
