[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 1/9] libxc: reorganize domain builder guest memory allocator
On Thu, Nov 12, 2015 at 12:29:06PM +0100, Juergen Gross wrote: > On 12/11/15 12:20, Ian Campbell wrote: > > On Thu, 2015-11-12 at 11:14 +0000, Wei Liu wrote: > >> On Thu, Nov 05, 2015 at 03:36:27PM +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> > >> > >> One question: did you test building with pygrub after this change? I > >> think the code is correct but we'd better be sure it doesn't break > >> pygrub. > > > > Did you mean pvgrub? (with a Vee) > > > > pygrub (with a Why) runs way before the libxc domain builder gets in on the > > act, doesn't it. > > Yep. > > To be clear: we have: > > - pygrub: running on dom0, mounts the root disk and analyzes the grub > configuration found, selects kernel and initrd and loads those via > libxl. > > - pvgrub: based on grub2, is started via libxl as paravirtualized kernel > in the new domain. pvgrub is reading the grub configuration and starts > the appropriate kernel via it's own mechanisms (patches for support of > huge domains are sent, no comments up to now). > > - stubdom based grub: subject to the patch we are discussing here. It is > being built in my environment, but not tested up to now. > > I think we use pvgrub to denote the third case (according to our wiki). The second case is just ... upstream grub2 with pv capability ? (So many grubs...) > Juergen > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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