linux-kernel - Re: [PATCH v3 17/30] KVM: s390: pci: enable host forwarding of Adapter Event Notifications

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Date:   Mon, 14 Feb 2022 15:35:41 -0500
From:   Matthew Rosato <mjrosato@...ux.ibm.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        schnelle@...ux.ibm.com, farman@...ux.ibm.com,
        borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...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, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 17/30] KVM: s390: pci: enable host forwarding of
 Adapter Event Notifications

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.