linux-kernel - RE: [PATCH V5 03/11] vfio/pci: Prepare for dynamic interrupt context storage

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Message-ID: <BN9PR11MB5276B08334B4AD974D6302508C7E9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Wed, 17 May 2023 02:12:01 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Chatre, Reinette" <reinette.chatre@...el.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "yishaih@...dia.com" <yishaih@...dia.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "darwi@...utronix.de" <darwi@...utronix.de>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Liu, Jing2" <jing2.liu@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "tom.zanussi@...ux.intel.com" <tom.zanussi@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V5 03/11] vfio/pci: Prepare for dynamic interrupt context
 storage

> From: Chatre, Reinette <reinette.chatre@...el.com>
> Sent: Thursday, May 11, 2023 11:45 PM
> 
> Interrupt context storage is statically allocated at the time
> interrupts are allocated. Following allocation, the interrupt
> context is managed by directly accessing the elements of the
> array using the vector as index.
> 
> It is possible to allocate additional MSI-X vectors after
> MSI-X has been enabled. Dynamic storage of interrupt context
> is needed to support adding new MSI-X vectors after initial
> allocation.
> 
> Replace direct access of array elements with pointers to the
> array elements. Doing so reduces impact of moving to a new data
> structure. Move interactions with the array to helpers to
> mostly contain changes needed to transition to a dynamic
> data structure.
> 
> No functional change intended.
> 
> Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>