linux-kernel - Re: [PATCH v5 10/21] KVM: s390: pci: add basic kvm

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Message-ID: <26fa1eef-8c89-8819-b12c-3b8caaf40bb2@linux.ibm.com>
Date:   Tue, 5 Apr 2022 09:51:34 -0400
From:   Matthew Rosato <mjrosato@...ux.ibm.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        farman@...ux.ibm.com, pmorel@...ux.ibm.com,
        borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
        imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com,
        oberpar@...ux.ibm.com, freude@...ux.ibm.com, thuth@...hat.com,
        pasic@...ux.ibm.com, pbonzini@...hat.com, corbet@....net,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v5 10/21] KVM: s390: pci: add basic kvm_zdev structure

On 4/5/22 4:20 AM, Niklas Schnelle wrote:
> On Mon, 2022-04-04 at 13:43 -0400, Matthew Rosato wrote:
>> This structure will be used to carry kvm passthrough information related to
>> zPCI devices.
>>
>> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
>> ---
>>   arch/s390/include/asm/pci.h |  3 +++
>>   arch/s390/kvm/Makefile      |  1 +
>>   arch/s390/kvm/pci.c         | 38 +++++++++++++++++++++++++++++++++++++
>>   arch/s390/kvm/pci.h         | 21 ++++++++++++++++++++
>>   4 files changed, 63 insertions(+)
>>   create mode 100644 arch/s390/kvm/pci.c
>>   create mode 100644 arch/s390/kvm/pci.h
>>
>> diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
>> index 4c5b8fbc2079..9eb20cebaa18 100644
>> --- a/arch/s390/include/asm/pci.h
>> +++ b/arch/s390/include/asm/pci.h
>> @@ -97,6 +97,7 @@ struct zpci_bar_struct {
>>   };
>>   
>>   struct s390_domain;
>> +struct kvm_zdev;
>>   
>>   #define ZPCI_FUNCTIONS_PER_BUS 256
>>   struct zpci_bus {
>> @@ -190,6 +191,8 @@ struct zpci_dev {
>>   	struct dentry	*debugfs_dev;
>>   
>>   	struct s390_domain *s390_domain; /* s390 IOMMU domain data */
>> +
>> +	struct kvm_zdev *kzdev; /* passthrough data */
>>   };
> 
> The struct zpci_dev tries to use semantic groups in its formatting.
> It's not perfect and we probably need to clean this up to remove some
> holes in the future. For now let's put the new kzdev without a blank
> line together with s390_domain and add a "section comment" like
> "IOMMU and passthrough".
> Also I'd drop the "... data" part of the line end comment or even drop
> it entirely, the name is pretty clear already when combined with the
> section comment.

Sure, will do

> 
> With that Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> 

Thanks!