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b=M+xmio9ZvLQQd4tOIMuM4bh1qihQHHKp/4ETopDOztabprihCxZChC5JczUq9nZ0B 23AFwn+qdcRhKQoXL3AWMaov3UlhBZxA1dX/ebuVXm1GPp6tyZye54Ipa/PPO57vqO PCU4ziQPWSL3HRcXdMSoGku5ChEqCo5PQWfGEJCBbZdyZkd8tEKy1MK8CMayC3IS7b neffwZhHhYqjnU8m16l2qfyuzmI7m1DY1px4/WxeYUd3MTKdYPussKaSgptgnzd733 1R9IjHosNiWp2eYcV/lJsKN/gzvxg5Y4KJOdPE+aXmX7aomi2u0Pbf9qeD9VRyNGzC PT3BN+diQgj+w== From: Pratyush Yadav To: Pasha Tatashin Cc: akpm@linux-foundation.org, bhe@redhat.com, rppt@kernel.org, jasonmiu@google.com, arnd@arndb.de, coxu@redhat.com, dave@vasilevsky.ca, ebiggers@google.com, graf@amazon.com, kees@kernel.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-mm@kvack.org Subject: Re: [PATCH v1 10/13] kho: Allow kexec load before KHO finalization In-Reply-To: <20251114155358.2884014-11-pasha.tatashin@soleen.com> (Pasha Tatashin's message of "Fri, 14 Nov 2025 10:53:55 -0500") References: <20251114155358.2884014-1-pasha.tatashin@soleen.com> <20251114155358.2884014-11-pasha.tatashin@soleen.com> Date: Fri, 14 Nov 2025 18:30:34 +0100 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: D43CA4001E X-Stat-Signature: 3xdd8hsbte53gs17knjhrq49ene9qctg X-Rspam-User: X-HE-Tag: 1763141438-904933 X-HE-Meta: U2FsdGVkX1/uqN/4rBEohXzRwK/Ry0sAYkYmFGlzz7yMiBDvHuefjddvRJx7dFge6y/KUG3jc/uCEQCa5reljB5ZKtWr/4lE7oWBMxOthuscrVo2Z4FGeCCuFrJkKNlrgrp/1zCoU40KQk5lAdADvOdidWdoXfgRCg0xm3k6Ck/yxa8W1PgGE36uqSnW6tv6+TnBOcb6lWO0Rk02pF3lEa0315Tv31CrcQ2Ebxr1WbBDteeH6D/GGcha53G2MhPf/jsIm1GaVeIDeBDr0JRyHM3AontX7ATQJIFPeUxI7fzvQoFoqjVOFOdYpTbIu8n4R1BL1Vd2Nf9W1nOGKmBMdu+CjEevPM04NFa4+5k1iSn5pGF5Yv7BlIKvNAcpsDM42h6iSKQ6cQVNHUW9KHzJPp6TquBRusRf+FK7S2o7qnTiEHTSCFISZbugm356HiE2XKfhiQrI4XG1s3QWNw271KXWL31ighFlNrgT5bhEOcbL64/PGIFOSXig5d6jZS9GWPc6SA9/R+F250BGV4eDlYB8Oh4GSJxwNa2GtvKKeH8mzxbt7mA4e8nc83GOJieHtDdaFDsQcP0OUXyeWMthXSKQfy25Be94KE3ljPQyR38TgvRWHq5WETI2+2wen7ZU5hdxP2fFGsZnMPwNOgy7WZGZ/W2Yi5BA0zGvmvx2JlT2eAeCGl6eMVGZel1zzNW0ESqk1zqhDhRLyaMnsFuMUA9CcFlNLZQzePgMrscvXFPKKKL9DUQWe462gvMI/0GL9qhPWmIRKxq5GSXHLBQw/WaqCsXX6wyaYjsfmf3V862mCtUMREpejRwjb2E99N9XK659zML5y5aqH3wXR3OggHJ/yuXhDAMEmN6qXaiHsY6E9mKsEcN9JXJinhzfYovLkCiZpOQIa9vQAnbe9oZcqS7OOp5DPU6UjTxpMLIDpNf9VmhmqEF2zfTdIYvuvv4SY+e1atKcjeq8TN2pkMC YKdvPcu1 GPGNTo8NM5hjaNcZn34HnYtIMLmJy7KDejg4LDhjaJcoFW2uvT1rzxyILbBuXfKiai0qrUrFRQ/vAefaBncJuBTWiASnKB8XDk0wCbMWl2/MYn2dJwh96PfQ1TPCXjA6Ba3+TWOx/KllAsIPS705RQvn8JWyrMWuwhbb1hULsBQ1ZgEjauskATdmFH/yE395G9FjOM8iFpLEEyWT900GG4YrECg== 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 Fri, Nov 14 2025, Pasha Tatashin wrote: > Currently, kho_fill_kimage() checks kho_out.finalized and returns > early if KHO is not yet finalized. This enforces a strict ordering where > userspace must finalize KHO *before* loading the kexec image. > > This is restrictive, as standard workflows often involve loading the > target kernel early in the lifecycle and finalizing the state (FDT) > only immediately before the reboot. > > Since the KHO FDT resides at a physical address allocated during boot > (kho_init), its location is stable. We can attach this stable address > to the kimage regardless of whether the content has been finalized yet. > > Relax the check to only require kho_enable, allowing kexec_file_load > to proceed at any time. > > Signed-off-by: Pasha Tatashin Reviewed-by: Pratyush Yadav [...] -- Regards, Pratyush Yadav