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

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Date:   Tue, 24 Jan 2023 00:55:06 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Alistair Popple <apopple@...dia.com>
Cc:     linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, jgg@...dia.com, jhubbard@...dia.com,
        tjmercier@...gle.com, hannes@...xchg.org, surenb@...gle.com,
        mkoutny@...e.com, daniel@...ll.ch,
        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:
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index ec32f78..a31dd53 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c

...

> @@ -780,6 +780,10 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
>  	u32 asid = iotlb_to_asid(iotlb);
>  	int r = 0;
>  
> +	if (!vdpa->use_va)
> +		if (vm_account_pinned(&dev->vm_account, PFN_DOWN(size)))
> +			return -ENOMEM;
> +
>  	r = vhost_iotlb_add_range_ctx(iotlb, iova, iova + size - 1,
>  				      pa, perm, opaque);
>  	if (r)

I suspect some error handling will have to be reworked then, no?

> -- 
> git-series 0.9.1