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Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest

From	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Newsgroups	linux.kernel
Subject	Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest
Date	2016-01-27 16:20 +0100
Message-ID	<qVA30-5qa-13@gated-at.bofh.it> (permalink)
References	(9 earlier) <qVzJF-4Zj-29@gated-at.bofh.it> <qVzJF-4Zj-31@gated-at.bofh.it> <qVzJE-4Zj-27@gated-at.bofh.it> <qVzTk-5mj-19@gated-at.bofh.it> <qVzTk-5mj-21@gated-at.bofh.it>
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On 01/27/2016 10:09 AM, David Vrabel wrote:
> 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@suse.com> wrote:
>>>>>> On Tue, Jan 26, 2016 at 4:04 PM, Luis R. Rodriguez <mcgrof@suse.com>
>>>>> 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.

Yes, I missed it ;-)

Why not continue relying on paravirt_enabled()? We are going to keep 
this in some form for HVMlite.

-boris

Thread

[PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-22 22:40 +0100
  Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-23 00:40 +0100
    Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Andrew Cooper <andrew.cooper3@citrix.com> - 2016-01-23 01:40 +0100
      Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-23 01:50 +0100
      Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-23 02:00 +0100
        Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Andrew Cooper <andrew.cooper3@citrix.com> - 2016-01-23 15:50 +0100
          Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "H. Peter Anvin" <hpa@zytor.com> - 2016-01-23 17:10 +0100
            Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-01-23 17:20 +0100
              Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "H. Peter Anvin" <hpa@zytor.com> - 2016-01-23 19:30 +0100
              Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Roger Pau Monné <royger@FreeBSD.org> - 2016-01-25 11:40 +0100
          Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-25 23:20 +0100
            Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-26 00:00 +0100
              Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-26 21:40 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-26 23:00 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-27 01:10 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-27 03:20 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest David Vrabel <david.vrabel@citrix.com> - 2016-01-27 16:00 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-27 16:10 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest David Vrabel <david.vrabel@citrix.com> - 2016-01-27 16:10 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-27 16:20 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-27 17:20 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-01-27 19:50 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-01-27 20:10 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Borislav Petkov <bp@suse.de> - 2016-01-27 17:20 +0100
          Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-01-26 17:20 +0100
      Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-25 16:10 +0100
    Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-25 17:10 +0100
      Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-25 22:20 +0100
        Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "H. Peter Anvin" <hpa@zytor.com> - 2016-01-25 22:30 +0100
          Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-25 23:30 +0100
            Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-26 19:40 +0100
              Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Andy Lutomirski <luto@amacapital.net> - 2016-01-26 19:50 +0100
                Re: [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-01-26 20:10 +0100
                Re: [Xen-devel] [PATCH v1 04/12] xen/hvmlite: Bootstrap HVMlite guest "Luis R. Rodriguez" <mcgrof@suse.com> - 2016-01-26 20:20 +0100

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