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[85.70.151.113]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-acaa1ccc2b7sm1132351666b.155.2025.04.15.12.11.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Apr 2025 12:11:31 -0700 (PDT) Message-ID: Date: Tue, 15 Apr 2025 21:11:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [regression 6.1.y] Regression from 476c1dfefab8 ("mm: Don't pin ZERO_PAGE in pin_user_pages()") with pci-passthrough for both KVM VMs and booting in xen DomU To: Salvatore Bonaccorso , David Howells , Christoph Hellwig , David Hildenbrand , Lorenzo Stoakes , Andrew Morton , Jens Axboe , Al Viro , Matthew Wilcox , Jan Kara , Jeff Layton , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , Linus Torvalds , Sasha Levin , Greg Kroah-Hartman Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, regressions@lists.linux.dev, table@vger.kernel.org, Bernd Rinn , =?UTF-8?B?S2FycmkgSMOkbcOkbMOkaW5lbg==?= , Cameron Davidson , Markus References: Content-Language: en-US From: Milan Broz Autocrypt: addr=gmazyland@gmail.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: qzahhahw33fjsqjxfcsfnb7dw7mot9zw X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: DAC3D4000D X-Rspam-User: X-HE-Tag: 1744744293-369616 X-HE-Meta: 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 r5Nk0xzN pOB39gtX7T+9NEJ3U6wXc4B4s+lMma3gqlp0ItvZ9iqOzVFPv5fGVkqWv7L8oNmwFVqyjWNfp3Z1qritE4UwAttHb5963wCvNI/JzMMGzg/rrSppXrnn5K5I7vDmstKqnR4QKDa9/kS5z+5dMZYGwZVtus9WFCVT6VM9eo70PzBRh5na3w9JfmoZvlb2RVn1UQcw62JRQjqTwFOd3/LmlSsNh0NTXjTYlbN+sBrMIDxIsKaPaxlKcKS22q+uY9/+3r8UPiehoFdYkynJ/G4+SVahdh1GkGiYbvwDKN/5qfOuTuXDVlbj5+2Qbv7jaQFZiHNGoxVnSwyHyoG6AKuygkNl4cBuXMkfJTpSYxQc8PNM0SS5Q71CEWM8jDNXFQbvmnrjfviJbM+ohhDCo6/y40QgxkOGoTFlEiWt9u+Njt4VSPN9mAngy1l2JB8ikR58SzmCbopbFz9oNcLg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000404, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/15/25 8:59 PM, Salvatore Bonaccorso wrote: > Milan verified that the issue persists in 6.1.134 so far and the patch > itself cannot be just reverted. Just an update: With 6.1.134 stable as a base, I reverted that commit (upstream c8070b78751955e59b42457b974bea4a4fe00187) + applied upstream commit 873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4 (vfio/type1: Unpin zero pages) + reverted upstream bddf10d26e6e5114e7415a0e442ec6f51a559468 (uprobes: Reject the shared zeropage in uprobe_write_opcode()) to be able compile code without errors. With these changes, kernel works with my NVMe passthrough test again. This confirms the issue. Milan > > The failures all have a similar pattern, when pci-passthrough is used > for a pci devide, for instance under qemu the bootup will fail with: > > qemu-system-x86_64: -device {"driver":"vfio-pci","host":"0000:03:00.0","id":"hostdev0","bus":"pci.3","addr":"0x0"}: VFIO_MAP_DMA failed: Cannot allocate memory > qemu-system-x86_64: -device {"driver":"vfio-pci","host":"0000:03:00.0","id":"hostdev0","bus":"pci.3","addr":"0x0"}: vfio 0000:03:00.0: failed to setup container > > (in the case as reported by Milan). > > Any ideas here? > > Regards, > Salvatore