Re: [Xen-devel] [PATCH v5 1/9] libxc: reorganize domain builder guest memory allocator

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Nov 12, 2015 at 03:03:32PM +0100, Juergen Gross wrote:
> On 12/11/15 14:48, Wei Liu wrote:
> > On Thu, Nov 12, 2015 at 02:43:28PM +0100, Juergen Gross wrote:
> >> Guest memory allocation in the domain builder of libxc is done via
> >> virtual addresses only. In order to be able to support preallocated
> >> areas not virtually mapped reorganize the memory allocator to keep
> >> track of allocated pages globally and in allocated segments.
> >>
> >> This requires an interface change of the allocate callback of the
> >> domain builder which currently is using the last mapped virtual
> >> address as a parameter. This is no problem as the only user of this
> >> callback is stubdom/grub/kexec.c using this virtual address to
> >> calculate the last used pfn.
> >>
> >> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> > 
> > If you've tested and confirmed pvgrub (stubdom based grub) doesn't
> > break:
> > 
> > Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> > 
> 
> Hmm, difficult. Is this ever tested automatically? I just tried and
> it died:
> 

Unfortunately it is not tested in osstest.

> ...
> vbd 51712 is hd0
> ******************* BLKFRONT for device/vbd/51712 **********
> backend at /local/domain/0/backend/qdisk/3/51712
> Failed to read /local/domain/0/backend/qdisk/3/51712/feature-barrier.
> 16777216 sectors of 0 bytes
> **************************
> 
> I guess I need a special setup to make it work. :-(
> 

Can you paste in your guest config here?


Wei.

> 
> Juergen

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