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Re: [Xen-devel] Enhancing Xen's Kconfig infrastructure to support tailored solutions


  • To: Wei Liu <wei.liu2@xxxxxxxxxx>, Lars Kurth <lars.kurth.xen@xxxxxxxxx>
  • From: George Dunlap <george.dunlap@xxxxxxxxxx>
  • Date: Mon, 18 Feb 2019 11:30:28 +0000
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  • Cc: James McKenzie <james.mckenzie@xxxxxxxxxxx>, robin.randhawa@xxxxxxx, 'Jan Beulich' <JBeulich@xxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Doug Goldstein <cardoe@xxxxxxxxxx>, Christopher Clark <christopher.w.clark@xxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, "Daniel P.Smith" <dpsmith.dev@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, committers@xxxxxxxxxxxxxx, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Stewart Hildebrand <Stewart.Hildebrand@xxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>
  • Delivery-date: Mon, 18 Feb 2019 11:31:02 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 2/18/19 11:23 AM, Wei Liu wrote:
> On Mon, Feb 18, 2019 at 11:17:56AM +0000, Lars Kurth wrote:
>> Thank you Wei. It's interesting though that the full vs HVM only is almost 
>> identical in terms of SLOC's
>> Lars
> 
> The cloc target counts the files in the dependency graph generated by
> make. A lot of the files contain both common x86 code and PV only code.
> So an HVM only build will count some of the PV code.

Still, what that shows is that there have been nearly 25k likes of code
identified as "HVM-only", while there have been less than 5k likes of
code identified as "PV-only".  That's quite a bit more lopsided than I
was expecting.

Perhaps part of the explanation is that PV came first, and HVM
afterwards; and the core "Xen" interfaces (grant tables, &c) are the
same between the two.  That is, HVM guests (if we include PVH dom0) have
the vast majority of functionality available to PV guests, while there
are large sections of functionality available to HVM guests to which PV
guests have no access.

 -George

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