linux-kernel - Re: [PATCH v13 00/21] KVM: xen: update shared_info and vcpu

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Message-ID: <bd028731-bc98-4735-a7f9-9b4ef9c00668@xen.org>
Date: Tue, 20 Feb 2024 17:07:17 +0000
From: Paul Durrant <xadimgnik@...il.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Jonathan Corbet <corbet@....net>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Janosch Frank <frankja@...ux.ibm.com>,
 Claudio Imbrenda <imbrenda@...ux.ibm.com>,
 David Hildenbrand <david@...hat.com>, Heiko Carstens <hca@...ux.ibm.com>,
 Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev
 <agordeev@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
 David Woodhouse <dwmw2@...radead.org>, Shuah Khan <shuah@...nel.org>,
 kvm@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v13 00/21] KVM: xen: update shared_info and vcpu_info
 handling

On 20/02/2024 16:15, Sean Christopherson wrote:
> On Tue, Feb 20, 2024, Paul Durrant wrote:
>> On 20/02/2024 15:55, Sean Christopherson wrote:
>>> On Thu, 15 Feb 2024 15:28:55 +0000, Paul Durrant wrote:
>>>> From: Paul Durrant <pdurrant@...zon.com>
>>>>
>>>> This series contains a new patch from Sean added since v12 [1]:
>>>>
>>>> * KVM: s390: Refactor kvm_is_error_gpa() into kvm_is_gpa_in_memslot()
>>>>
>>>> This frees up the function name kvm_is_error_gpa() such that it can then be
>>>> re-defined in:
>>>>
>>>> [...]
>>>
>>> *sigh*
>>>
>>> I forgot to hit "send" on this yesterday.  But lucky for me, that worked out in
>>> my favor as I needed to rebase on top of kvm/kvm-uapi to avoid pointless conflicts
>>> in the uapi headeres.
>>>
>>> So....
>>>
>>> Applied to kvm-x86 xen, minus 18 and 19 (trylock stuff) and 21 (locking cleanup
>>> that we're doing elsewhere).
>>>
>>
>> Looks like you meant 17 & 18?
> 
> Doh, yes.
> 
>>> Paul and David, please take (another) look at the end result to make sure you don't
>>> object to any of my tweaks and that I didn't botch anything.
>>>
>>
>> What was the issue with 17? It was reasonable clean-up and I'd like to keep
>> it even without 18 being applied (and I totally understand your reasons for
>> that).
> 
> I omitted it purely to avoid creating an unnecessary dependency for the trylock
> patch.  That way the trylock patch (or whatever it morphs into) can be applied on
> any branch (along with the cleanup), i.e. doesn't need to be taken through kvm-x86/xen.

Ok, personally I don't see the dependency being an issue. I suspect it 
will be a while before we decide what to do about the locking issue... 
particularly since David is out this week, as he says.