linux-kernel - Re: [PATCH] kvm/vfio: Fix potential deadlock on vfio group

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Message-ID: <Y9kqNnJ5ayCQSW9z@nvidia.com>
Date:   Tue, 31 Jan 2023 10:48:22 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Anthony Krowiak <akrowiak@...ux.ibm.com>
Cc:     Yi Liu <yi.l.liu@...el.com>, alex.williamson@...hat.com,
        pbonzini@...hat.com, mjrosato@...ux.ibm.com, kevin.tian@...el.com,
        cohuck@...hat.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
        borntraeger@...ux.ibm.com, frankja@...ux.ibm.com,
        imbrenda@...ux.ibm.com, david@...hat.com, jjherne@...ux.ibm.com,
        pasic@...ux.ibm.com, zhenyuw@...ux.intel.com, zhi.a.wang@...el.com,
        seanjc@...gle.com, linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm/vfio: Fix potential deadlock on vfio group_lock

On Tue, Jan 31, 2023 at 09:46:18AM -0500, Anthony Krowiak wrote:

> > Maybe you should split that lock and have a dedicated apcb lock?
> 
> I don't think that would suffice for taking the vCPUs out of SIE.

Then I think we have to keep this patch and also do Matthew's patch to
keep kvm refs inside vfio as well.

Jason