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X-CSE-ConnectionGUID: FYH0mflxRK6K7dLS0+wHtA== X-CSE-MsgGUID: iXdKk7C+TBGi4EuSw5TcjQ== X-IronPort-AV: E=McAfee;i="6800,10657,11585"; a="88407053" X-IronPort-AV: E=Sophos;i="6.19,237,1754982000"; d="scan'208";a="88407053" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2025 10:05:31 -0700 X-CSE-ConnectionGUID: wv14bvpDRaysAp063ScWFg== X-CSE-MsgGUID: 2JORsTsMRYCDyk5UOPg6Rw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,237,1754982000"; d="scan'208";a="181970680" Received: from spandruv-mobl4.amr.corp.intel.com (HELO [10.125.108.40]) ([10.125.108.40]) by orviesa010-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2025 10:05:28 -0700 Message-ID: Date: Fri, 17 Oct 2025 10:05:26 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot ci] Re: Fix stale IOTLB entries for kernel address space To: Baolu Lu , syzbot ci , akpm@linux-foundation.org, apopple@nvidia.com, bp@alien8.de, dave.hansen@linux.intel.com, david@redhat.com, iommu@lists.linux.dev, jannh@google.com, jean-philippe@linaro.org, jgg@nvidia.com, joro@8bytes.org, kevin.tian@intel.com, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, luto@kernel.org, mhocko@kernel.org, mingo@redhat.com, peterz@infradead.org, robin.murphy@arm.com, rppt@kernel.org, security@kernel.org, stable@vger.kernel.org, tglx@linutronix.de, urezki@gmail.com, vasant.hegde@amd.com, vbabka@suse.cz, will@kernel.org, willy@infradead.org, x86@kernel.org, yi1.lai@intel.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com References: <68eeb99e.050a0220.91a22.0220.GAE@google.com> <89146527-3f41-4f1e-8511-0d06e169c09e@intel.com> <8cdb459f-f7d1-4ca0-a6a0-5c83d5092cd8@linux.intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 23707C000C X-Rspamd-Server: rspam03 X-Stat-Signature: 33frnnk8kmto5e4m55op1dmofb4mh431 X-HE-Tag: 1760720732-345309 X-HE-Meta: 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 n8ErQ+EV WT592 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: List-Subscribe: List-Unsubscribe: On 10/16/25 01:00, Baolu Lu wrote: > while, in this patch, we need the page descriptor that a pmd entry > points to. Perhaps we should roll back to the previous approach used in > v5? Yeah, we should roll back to what v5 did. pmd_ptdesc() is a bit deceiving.