[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest
On 27/01/16 15:06, Boris Ostrovsky wrote: > On 01/27/2016 09:50 AM, David Vrabel wrote: >> On 27/01/16 14:42, Konrad Rzeszutek Wilk wrote: >>> On Tue, Jan 26, 2016 at 08:54:56PM -0800, Luis R. Rodriguez wrote: >>>> On Jan 26, 2016 6:16 PM, "Luis R. Rodriguez" <mcgrof@xxxxxxxx> wrote: >>>>> On Tue, Jan 26, 2016 at 4:04 PM, Luis R. Rodriguez <mcgrof@xxxxxxxx> >>>> wrote: >>>>>> You go: >>>>>> >>>>>> hvmlite_start_xen() --> >>>>>> HVM stub >>>>>> startup_64() | (startup_32() >>>>> Hrm, does HVMlite work well with load_ucode_bsp(), note the patches to >>>>> rebrand pv_enabled() to pv_legacy() or whatever, this PV type will not >>>>> be legacy or crap / old, so we'd need a way to catch it if we should >>>>> not use that code for this PV type. This begs the question, are you >>>>> also sure other callers in startup_32() or startup_64() might be OK as >>>>> well where previously guarded with pv_enabled() ? >>>> Actually this call can't be used, and if early code used it prior to >>>> setup_arch() it'd be a bug as its only properly set until later. >>>> Vetting >>>> for correctness of all code call is still required though and >>>> perhaps we do >>>> need something to catch now this PV type on early code such as this >>>> one if >>>> we don't want it. From what I've gathered before on other bsp ucode we >>>> don't want ucode loaded for PV guest types through these mechanisms. >>> It may help to not think of PVH/hvmlite as PV. It really is HVM with >>> a lot >>> of emulated devices removed. >>> >>> How does early microcode work on EFI? Does the EFI stub code have an >>> early >>> microcode loading code ? >> Surely the interesting comparison here is how is (early) microcode >> loading disabled in KVM guests? We should use the same mechanism for ^^^^^^^^ >> HVMlite guests. > > > Why would we ever want to have a guest load microcode during boot? I can > see how a (privileged) guest may want to load microcode from a shell > (via microcode driver). I think you missed a word when you read my reply. David _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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