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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778497224; bh=izvnagj9ZLJVxR+qNc7RMbvt9I2ey8INGl6X8JOMJbo=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=EKgSxuzDb6hj8qW6BihC8pNQpuLkpsS/rpx3FJpEScZc4OBPrfWt/ibmj9igKBasG SFrgdhQpEKGkgE7P+7isoCIrzDb6xjlhFz8R1QS5FGx062XzkqMqmmup+di9h16mCp m6IijHxemds9GdkcSbj8GdRq9Re49Al/h86jRNbdBqsGV7AhmqdJw8mr73Si8CFNAD I+MMOroM3IEeHiuzN7ErYkwMESlI79yRWU0TB6+/t7r1mHBjWHClN8I8OqKjMUEDda nniyDISCueVN8cpTW/129Lv+ty0uhEJDy3XcPqu/9eUwEUGPA3K7foSNF599cCajlV xOMnTylqpXrjA== From: Pratyush Yadav To: Pasha Tatashin Cc: rppt@kernel.org, sourabhjain@linux.ibm.com, jbouron@amazon.com, akpm@linux-foundation.org, linux-mm@kvack.org, bhe@redhat.com, linux-kernel@vger.kernel.org, dan.carpenter@linaro.org, rafael.j.wysocki@intel.com, piliu@redhat.com, kexec@lists.infradead.org, pratyush@kernel.org, graf@amazon.com, changyuanl@google.com, mario.limonciello@amd.com Subject: Re: [PATCH v2 1/3] kho: skip KHO data for context-preserving kexec In-Reply-To: <20260506182039.2623553-6-pasha.tatashin@soleen.com> (Pasha Tatashin's message of "Wed, 6 May 2026 14:20:41 -0400") References: <20260506182039.2623553-5-pasha.tatashin@soleen.com> <20260506182039.2623553-6-pasha.tatashin@soleen.com> Date: Mon, 11 May 2026 13:00:20 +0200 Message-ID: <2vxzzf26cit7.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Stat-Signature: kp7cnic834w3oz7s1t43mwee5fyrh968 X-Rspam-User: X-Rspamd-Queue-Id: 5E14240012 X-Rspamd-Server: rspam07 X-HE-Tag: 1778497225-986310 X-HE-Meta: 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 cN/AONIj qwGdAasrt1QWlNl8ZAiNWf/MMerHVsgR/y/4/G16fGhIDWE9cc2ziqWJDvehN4Xk7UBy5qbLfC4kX6qS/p+d4FA3Uidry1aMFFHcBXk/vkSjj1tTz5D2fgv6YopigB/Ebd05zeK50aJnYUQwFSz2i1cHK6SW6QCDHZEkb8SCAR0RYHuTJB/bloXoopUWQwKZt/jf71adlPIuzAyd643AM3+HTnEu6M8+IsguShyUbdwDjUUJcLDmI88yAGylO24wr499hk1JKUMNv0iOUAugGy9LjCg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, May 06 2026, Pasha Tatashin wrote: > A preserve_context kexec returns to the current kernel, which means the > 2nd kernel does not use KHO data (and their memory spaces don't > overlap). Passing KHO data to the 2nd kernel via setup_data or > devicetree is unnecessary. > > Add a check in kho_fill_kimage() and return early if preserve_context is > set, to avoid passing KHO state during context-preserving kexecs. > > Fixes: 3bdecc3c93f9 ("kexec: add KHO support to kexec file loads") > Signed-off-by: Pasha Tatashin Reviewed-by: Pratyush Yadav (Google) [...] -- Regards, Pratyush Yadav