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Wed, 08 Oct 2025 17:25:35 -0700 (PDT) Received: from twshared18070.28.prn2.facebook.com (2620:10d:c0a8:1b::30) by mail.thefacebook.com (2620:10d:c0a9:6f::8fd4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.20; Thu, 9 Oct 2025 00:25:34 +0000 Received: by devgpu015.cco6.facebook.com (Postfix, from userid 199522) id 9DDD1DBEADF; Wed, 8 Oct 2025 17:25:20 -0700 (PDT) Date: Wed, 8 Oct 2025 17:25:20 -0700 From: Alex Mastro To: Alex Williamson CC: Jason Gunthorpe , Alejandro Jimenez , , Subject: Re: [PATCH v2 3/3] vfio/type1: handle DMA map/unmap up to the addressable limit Message-ID: References: <20251007-fix-unmap-v2-0-759bceb9792e@fb.com> <20251007-fix-unmap-v2-3-759bceb9792e@fb.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20251007-fix-unmap-v2-3-759bceb9792e@fb.com> X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: TGme5PG_BiSGc1OAUA9HHo--NkuYT1zN X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDA5MDAwMSBTYWx0ZWRfX5BzkB6JhBNmY QMRjEH/geNmonHrkWTFobfnozlJAeey3nQvoQLZ7iI/Z0o0eGC79tjomL+FIZCIXgCIpqVf3eUU aZcsmxOfX9DWVWI7mhKCgMvjLE0wAs4ig0whdp+vw3fidlsizv/+dnwtsLfynYSTb3iTnRG/lYX gL3bTZibbNIRmFCaG/YB7gt3VdgGGLJ0fS+nve253sr2nUbh5fP195qLcdHKLbd62lKWb3/fdzl JgRT89WwoiZk6vdrxY4mJWujxPC12EDUDuEdxhHi1kPWixhlyluGbnswe4ysifqGqKNoQIbJXQV pNTbYLDL+jfs21nkRma/As18JbLqrP4/fCw8js6yvXXtxgYfgVzXwLK9nhO++gSx8TpDyco7GQo xFAao7ETmkExP38b9AJA0zu/vjXdmg== X-Authority-Analysis: v=2.4 cv=H4LWAuYi c=1 sm=1 tr=0 ts=68e700ff cx=c_pps a=MfjaFnPeirRr97d5FC5oHw==:117 a=MfjaFnPeirRr97d5FC5oHw==:17 a=kj9zAlcOel0A:10 a=x6icFKpwvdMA:10 a=ofdlg-NLLL_6ULEM8BEA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: TGme5PG_BiSGc1OAUA9HHo--NkuYT1zN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-08_08,2025-10-06_01,2025-03-28_01 On Tue, Oct 07, 2025 at 09:08:48PM -0700, Alex Mastro wrote: > @@ -1401,17 +1409,17 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu, > if (dma && dma->iova != iova) > goto unlock; > > - dma = vfio_find_dma(iommu, iova_end, 0); > - if (dma && dma->iova + dma->size != iova + size) > + dma = vfio_find_dma(iommu, iova_end, 1); > + if (dma && dma->iova + dma->size - 1 != iova_end) > goto unlock; > } > > ret = 0; > - n = first_n = vfio_find_dma_first_node(iommu, iova, size); > + n = first_n = vfio_find_dma_first_node(iommu, iova, iova_end); I missed updating iova_end to be consistent in the unmap_all case, which is broken with this change. Currently, iova_end is only assigned by the check_add_overflow call in the !unmap_all path. Will address in v3.