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[142.68.57.212]) by smtp.gmail.com with ESMTPSA id o67sm11728381qka.114.2020.03.23.18.15.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 23 Mar 2020 18:15:13 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1jGY9u-0000ra-FL; Mon, 23 Mar 2020 22:15:10 -0300 From: Jason Gunthorpe To: Jerome Glisse , Ralph Campbell , Felix.Kuehling@amd.com Cc: linux-mm@kvack.org, John Hubbard , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Philip Yang , Jason Gunthorpe Subject: [PATCH v2 hmm 9/9] mm/hmm: return error for non-vma snapshots Date: Mon, 23 Mar 2020 22:14:57 -0300 Message-Id: <20200324011457.2817-10-jgg@ziepe.ca> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200324011457.2817-1-jgg@ziepe.ca> References: <20200324011457.2817-1-jgg@ziepe.ca> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Jason Gunthorpe The pagewalker does not call most ops with NULL vma, those are all routed to pte_hole instead. Thus hmm_vma_fault() is only called with a NULL vma from hmm_vma_walk_hole(), so hoist the check to there. Now it is clear that snapshotting with no vma is a HMM_PFN_ERROR as without a vma we have no path to call hmm_vma_fault(). Signed-off-by: Jason Gunthorpe --- mm/hmm.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/hmm.c b/mm/hmm.c index 14c33e1225866c..df0574061b37d3 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -83,9 +83,6 @@ static int hmm_vma_fault(unsigned long addr, unsigned l= ong end, WARN_ON_ONCE(!required_fault); hmm_vma_walk->last =3D addr; =20 - if (!vma) - return -EFAULT; - if ((required_fault & HMM_NEED_WRITE_FAULT) =3D=3D HMM_NEED_WRITE_FAULT= ) { if (!(vma->vm_flags & VM_WRITE)) return -EPERM; @@ -175,6 +172,11 @@ static int hmm_vma_walk_hole(unsigned long addr, uns= igned long end, npages =3D (end - addr) >> PAGE_SHIFT; pfns =3D &range->pfns[i]; required_fault =3D hmm_range_need_fault(hmm_vma_walk, pfns, npages, 0); + if (!walk->vma) { + if (required_fault) + return -EFAULT; + return hmm_pfns_fill(addr, end, range, HMM_PFN_ERROR); + } if (required_fault) return hmm_vma_fault(addr, end, required_fault, walk); hmm_vma_walk->last =3D addr; --=20 2.25.2