From: Ben Skeggs <skeggsb@gmail.com>
To: Ralph Campbell <rcampbell@nvidia.com>
Cc: ML dri-devel <dri-devel@lists.freedesktop.org>,
linux-rdma@vger.kernel.org, linux-mm@kvack.org,
LKML <linux-kernel@vger.kernel.org>,
ML nouveau <nouveau@lists.freedesktop.org>,
Jason Gunthorpe <jgg@mellanox.com>,
Ben Skeggs <bskeggs@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [Nouveau] [PATCH v3 1/4] nouveau/hmm: fix vma range check for migration
Date: Thu, 12 Mar 2020 17:55:39 +1000 [thread overview]
Message-ID: <CACAvsv4+od30K-FAr5Fet7kOz1APRDTXmHRc3fN4eiCVDhY02w@mail.gmail.com> (raw)
In-Reply-To: <20200304001339.8248-2-rcampbell@nvidia.com>
I've taken all 4 patches in my tree.
Thanks Ralph,
Ben.
On Wed, 4 Mar 2020 at 10:14, Ralph Campbell <rcampbell@nvidia.com> wrote:
>
> find_vma_intersection(mm, start, end) only guarantees that end is greater
> than or equal to vma->vm_start but doesn't guarantee that start is
> greater than or equal to vma->vm_start. The calculation for the
> intersecting range in nouveau_svmm_bind() isn't accounting for this and
> can call migrate_vma_setup() with a starting address less than
> vma->vm_start. This results in migrate_vma_setup() returning -EINVAL for
> the range instead of nouveau skipping that part of the range and migrating
> the rest.
>
> Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
> ---
> drivers/gpu/drm/nouveau/nouveau_svm.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
> index df9bf1fd1bc0..169320409286 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_svm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
> @@ -179,6 +179,7 @@ nouveau_svmm_bind(struct drm_device *dev, void *data,
> if (!vma)
> break;
>
> + addr = max(addr, vma->vm_start);
> next = min(vma->vm_end, end);
> /* This is a best effort so we ignore errors */
> nouveau_dmem_migrate_vma(cli->drm, vma, addr, next);
> --
> 2.20.1
>
> _______________________________________________
> Nouveau mailing list
> Nouveau@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau
next prev parent reply other threads:[~2020-03-12 7:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-04 0:13 [PATCH v3 0/4] nouveau/hmm: map pages after migration Ralph Campbell
2020-03-04 0:13 ` [PATCH v3 1/4] nouveau/hmm: fix vma range check for migration Ralph Campbell
2020-03-12 7:55 ` Ben Skeggs [this message]
2020-03-04 0:13 ` [PATCH v3 2/4] nouveau/hmm: check for SVM initialized before migrating Ralph Campbell
2020-03-04 0:13 ` [PATCH v3 3/4] nouveau: remove useless SVM range check Ralph Campbell
2020-03-04 0:13 ` [PATCH v3 4/4] nouveau/hmm: map pages after migration Ralph Campbell
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