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Message-ID: <34251cd7-7e07-f571-2790-cb1cd001813a@linux.ibm.com>
Date:   Mon, 14 Feb 2022 15:35:41 -0500
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Subject: Re: [PATCH v3 17/30] KVM: s390: pci: enable host forwarding of
 Adapter Event Notifications
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To:     Pierre Morel <pmorel@linux.ibm.com>, linux-s390@vger.kernel.org
Cc:     alex.williamson@redhat.com, cohuck@redhat.com,
        schnelle@linux.ibm.com, farman@linux.ibm.com,
        borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com,
        gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
        frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com,
        vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com,
        thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20220204211536.321475-1-mjrosato@linux.ibm.com>
 <20220204211536.321475-18-mjrosato@linux.ibm.com>
 <7ecb4a93-5a41-a9e2-0a01-9eccabfa85ad@linux.ibm.com>
From:   Matthew Rosato <mjrosato@linux.ibm.com>
In-Reply-To: <7ecb4a93-5a41-a9e2-0a01-9eccabfa85ad@linux.ibm.com>
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On 2/14/22 7:59 AM, Pierre Morel wrote:
> 
> 
> On 2/4/22 22:15, Matthew Rosato wrote:
...
>> +static void aen_process_gait(u8 isc)
>> +{
>> +    bool found = false, first = true;
>> +    union zpci_sic_iib iib = {{0}};
>> +    unsigned long si, flags;
>> +
>> +    spin_lock_irqsave(&aift->gait_lock, flags);
>> +
>> +    if (!aift->gait) {
>> +        spin_unlock_irqrestore(&aift->gait_lock, flags);
>> +        return;
>> +    }
>> +
>> +    for (si = 0;;) {
>> +        /* Scan adapter summary indicator bit vector */
>> +        si = airq_iv_scan(aift->sbv, si, airq_iv_end(aift->sbv));
>> +        if (si == -1UL) {
>> +            if (first || found) {
>> +                /* Reenable interrupts. */
>> +                if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, isc,
>> +                              &iib))
>> +                    break;
> 
> I thought we agreed that the test is not useful here.

Oops, you are correct -- it looks like I simply failed to apply any of 
your suggestions from that particular email, must have marked it 'done' 
on accident -- sorry about that.  I've gone ahead and made these changes 
already on my in-progress v4 branch.  Thanks for pointing it out.