linux-kernel - Re: [PATCH] nouveau: fix page fault on device private memory

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Message-ID: <1c004a46-c818-7d4c-254a-60b5c932d67b@nvidia.com>
Date:   Fri, 26 Jun 2020 11:05:14 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Ralph Campbell <rcampbell@...dia.com>,
        <nouveau@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     Jerome Glisse <jglisse@...hat.com>, Christoph Hellwig <hch@....de>,
        "Jason Gunthorpe" <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH] nouveau: fix page fault on device private memory

On 2020-06-26 10:26, Ralph Campbell wrote:
> If system memory is migrated to device private memory and no GPU MMU
> page table entry exists, the GPU will fault and call hmm_range_fault()
> to get the PFN for the page. Since the .dev_private_owner pointer in
> struct hmm_range is not set, hmm_range_fault returns an error which
> results in the GPU program stopping with a fatal fault.
> Fix this by setting .dev_private_owner appropriately.
> 
> Fixes: 08ddddda667b ("mm/hmm: check the device private page owner in hmm_range_fault()")
> Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
> ---
> 
> This is based on Linux-5.8.0-rc2 and is for Ben Skeggs nouveau tree.
> It doesn't depend on any of the other nouveau/HMM changes I have
> recently posted.

Maybe cc stable, seeing as how the problem affect Linux 5.7?

thanks,
-- 
John Hubbard
NVIDIA

> 
>   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 ba9f9359c30e..6586d9d39874 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_svm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
> @@ -562,6 +562,7 @@ static int nouveau_range_fault(struct nouveau_svmm *svmm,
>   		.end = notifier->notifier.interval_tree.last + 1,
>   		.pfn_flags_mask = HMM_PFN_REQ_FAULT | HMM_PFN_REQ_WRITE,
>   		.hmm_pfns = hmm_pfns,
> +		.dev_private_owner = drm->dev,
>   	};
>   	struct mm_struct *mm = notifier->notifier.mm;
>   	int ret;
>