[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen/x86: Adjust stack pointer in xen_sysexit
On Mon, Nov 16, 2015 at 1:03 PM, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote: > On Mon, Nov 16, 2015 at 12:50:19PM -0800, Andy Lutomirski wrote: >> On Mon, Nov 16, 2015 at 12:48 PM, Boris Ostrovsky >> <boris.ostrovsky@xxxxxxxxxx> wrote: >> > On 11/16/2015 03:22 PM, Borislav Petkov wrote: >> >> >> >> On Mon, Nov 16, 2015 at 12:11:11PM -0800, Andy Lutomirski wrote: >> >> >> >>> Are there really multiple feature bits for this stuff? I'd like to >> >>> imagine that the entry code is all either Xen PV or native/PVH/PVHVM >> >>> -- i.e. I assumed that PVH works like native for all entries. >> > >> > >> > >> > Almost. For PVH we will have a small stub to set up bootparams and such but >> > then we jump to startup_{32|64} code. >> > >> > >> >> I just reacted to Boris' statement: >> >> >> >> "We don't currently have a Xen-specific CPU feature. We could, in >> >> principle, add it but we can't replace all of current paravirt patching >> >> with a single feature since PVH guests use a subset of existing pv ops >> >> (and in the future it may become even more fine-grained)." >> > >> > >> > Actually, nevermind this --- I was thinking about APIC ops and they are not >> > pv ops. >> > >> > Note though that there are other users of pv ops --- lguest and looks like >> > KVM (for one op) use them too. >> > >> >> Honestly, I think we should just delete lguest some time soon. And >> KVM uses this stuff so lightly that we shouldn't need all of the pvop >> stuff. (In fact, I'm slowly working on removing KVM_GUEST's >> dependency on PARAVIRT.) > > Even for the pvclock? > > (sorry for stealing this thread on this subject). I don't think that pvclock uses any of the paravirt infrastructure. It's just another clock source AFAIK. --Andy -- Andy Lutomirski AMA Capital Management, LLC _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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