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[130.117.225.111]) by mx.google.com with ESMTPS id 5b1f17b1804b1-4aa82328ecfsi243928165e9.9.2026.11.02.02.20.47 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2026 02:20:47 -0800 (PST) Received-SPF: pass (google.com: domain of vasileios.almpanis@virtuozzo.com designates 130.117.225.111 as permitted sender) client-ip=130.117.225.111; Authentication-Results: mx.google.com; dkim=pass header.i=@virtuozzo.com header.s=relay header.b=RvF9z8RF; spf=pass (google.com: domain of vasileios.almpanis@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=vasileios.almpanis@virtuozzo.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=virtuozzo.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=Message-Id:Date:From:Subject:Content-Type: MIME-Version; bh=+LZVAAZOvxe5xS9b6mmafAWcJ3DMAIEuwFl8H4tjIYA=; b=RvF9z8RF51G4 hNwgixHy1v/rrPAZAuNhG6vhjFRoj2mfk/8LoCt5Nmw2ezL292ySxl7fgvwMACB4bT8bUS2RzUsIo oJ5tzUwvSTE7KkLm5bQjQCMK5ac+hBKqTyhSbI1LIHEoiySGbaGRhOYVIOAoA5t4Pi7X06HPfWyMu MV9bapePsbsYmurMI6hxYOzTu9YqoEDfRWubM4NzQDZZnE7/Hgg0W9IxWcNuGMz5YmYOLcotnddlG VvEFwlGCxjgEt9h1NjfERHJW3AsemSHRaEd5QY5ED5PAKU6DYXV2O7AX036cVyuYgjb/M9bLEAvhi uSSPU8iRsNGgAPsfxNT63A==; Received: from [130.117.225.5] (helo=dev010.ch-qa.vzint.dev) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1xNp5p-004rjn-0v; Mon, 02 Nov 2026 11:20:38 +0100 MIME-Version: 1.0 From: Vasileios Almpanis To: Vladimir Riabchun In-Reply-To: <20261102100432.15867-1-vladimir.riabchun@virtuozzo.com> References: <20261102100432.15867-1-vladimir.riabchun@virtuozzo.com> Date: Mon, 02 Nov 2026 10:20:45 +0000 Message-Id: <179361484560.547869.14015842402824421794.b4-review@b4> X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1793614846; l=843; i=vasileios.almpanis@virtuozzo.com; s=20260812; h=from:subject:message-id; bh=ivPNyvLJVO11wGrJFMaxIVBAcWTgEhtm4OlhXunKkR4=; b=2jL3ayeqWS05UVhnYLYX+PxG/dqgKuOJrlaPpEQCG950QYDC9NcS28+oSeCKqeiSrt0Qod/Dn LkgdfaY4C3yCd4c3PMIP1ydjkt7Adv1B292Uknv1LJ0ltA+t29jlIaY X-Developer-Key: i=vasileios.almpanis@virtuozzo.com; a=ed25519; pk=HhuHDXAcPva9A8zccWEMRsb36reu+y4IVbBjXKxNUjw= X-OZ-Fwd: true Cc: devel@openvz.org Subject: Re: [Devel] [PATCH RK VZ10] x86/traps: emulate CPUID faults for user tasks in exc_general_protection() X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org On Mon, 02 Nov 2026 11:04:32 +0100, Vladimir Riabchun wrote: > A non-empty /proc/vz/cpuid_override table makes ve_setup_task() set > TIF_CPUID_OVERRIDE on every task entering a VE, so the CPU raises #GP > on each CPUID the task executes and check_cpuid_fault() is supposed > to emulate the instruction with the table values. > > The call sits after the user-mode branch of exc_general_protection(), > which ends in gp_user_force_sig_segv() and goto exit, so it is reached > only for a kernel-mode #GP, where CPUID never faults. Every Container > task dies with SIGSEGV on the first CPUID of glibc init_cpu_features() > instead of getting the override: > > [...] Reviewed-by: Vasileios Almpanis -- Vasileios Almpanis _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel