[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 12/11/15 12:32, Wei Liu wrote: > 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 ? Urgs. Okay. Nevertheless: I've built it. :-) > (So many grubs...) I'm particularly happy you didn't come up with a variant I wasn't aware of. :-) Juergen _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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