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Re: [Xen-devel] [PATCH for-4.12] passthrough/vtd: Drop the "workaround_bios_bug" logic entirely
- To: Jan Beulich <JBeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Thu, 28 Mar 2019 15:06:03 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Lars Kurth <lars.kurth@xxxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 28 Mar 2019 15:06:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 3/26/19 1:39 PM, Jan Beulich wrote:
>> This is a regression in 4.12 and needs resolving. The choice is between
>> reverting dcf41790 or removing this code, and reverting dcf41790 is
>> obviously not a valid thing to do.
>
> As explained before, there was an earlier regression, which - if it
> had been noticed in time - would have made all versions from 4.2
> to 4.11 behave like 4.12 without your change. This behavior was
> intended by the original author. Ripping the code out by convincing
> people to bypass normal review flow is, well, not very nice to put it
> mildly.
I would like to say, I thought Andy tried to be very scrupulous here.
He had two different R-b's from people familiar with the code, and an
Ack from the release coordinator. I think he would have been justified
in checking the patch in on that basis, but just to make sure he was
doing the right thing, he asked someone else from "The Rest" (me) to
double-check to make sure.
Given the difference between how the two of you approach this sort of
thing, I understand why you might interpret that in a negative light.
But I don't think it's in the best interest of the project for people to
be completely risk-averse in this sort of situation. We have source
control for a reason: If the change turns out to have been wrong, we can
revert it.
-George
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