linux-kernel - Re: [RFC PATCH 02/19] drivers/vhost: Convert to use vm

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Message-ID: <Y8/scE3jhEQ+d69C@nvidia.com>
Date:   Tue, 24 Jan 2023 10:34:24 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Alistair Popple <apopple@...dia.com>
Cc:     linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, jhubbard@...dia.com,
        tjmercier@...gle.com, hannes@...xchg.org, surenb@...gle.com,
        mkoutny@...e.com, daniel@...ll.ch,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH 02/19] drivers/vhost: Convert to use vm_account

On Tue, Jan 24, 2023 at 04:42:31PM +1100, Alistair Popple wrote:

> @@ -799,9 +803,6 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
>  		return r;
>  	}
>  
> -	if (!vdpa->use_va)
> -		atomic64_add(PFN_DOWN(size), &dev->mm->pinned_vm);

Mention in the commit message this fixes a "bug" where vhost didn't
respect the limits

Jason