From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BC030202F7A; Fri, 4 Oct 2024 18:25:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728066332; cv=none; b=LeMmGNEb/HST0KBITwjQbCel7fDqfbJXVGwNdy2qLvcFPQ3sU0mj3IxFlmRiwZiNStupdmUcreSKizBa6vG2bwij080wcVOYWQDqXd2UzDXrAbj6HYy2kMXWM6bTjf9ZDUNvIcw+N1rf9L8QVUFzpJ923tIBNyqGb8QTPYkioOw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728066332; c=relaxed/simple; bh=ZEJKq/ubhV1Vn7Nh2b6yEgBNxLnYrYqefCGOyXboopI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AoiIPjJG01sTJNM/kB4KpGVr13FQfN+Z9g3aHmL+E+bVY8BISth8JZhrNuy4UtkwR82aJmtfodrsN8WyirDdRKnhqCnUp9C0fRJ1zAi4q/N4mEh+O4BVNK0di0zFoOgoprZLDxO9kroP67PavyY4HmWwxvaPwJTclw63OnucHs8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dLof01CW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dLof01CW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E386C4CECD; Fri, 4 Oct 2024 18:25:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728066332; bh=ZEJKq/ubhV1Vn7Nh2b6yEgBNxLnYrYqefCGOyXboopI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dLof01CWTq65n4hxrDLjtefwFztcJLqPuvdS9VLFhVbdk50ZA0Se+VQslVvO4ukHL V/N/bqL8y7x+idDXl88PCytvXxJIsc1GM9ZZF2aIkGLkxdw1pR8d+KDsYcSTEwDC3A VJzGMB9yH5WKks+dksnM8S8GU4ho/Yjp5+I3QC/CBIG7A4BZhhl979IuMngmgH9LwK BhiBlWWLW9A6Fx6vs7P79XnRilN38kEaEoJ5ltOIZuohVANLe+JN6KrkKqp06wGUH/ 4f/rqwRZxmYZVCyRRU1RoVrypcy2AhGc2LPn3oxGOymeUW7tk8j35+UZPSx+dBXq6W cHA+f2G9dr36Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Heiko Carstens , Sven Schnelle , Vasily Gorbik , Sasha Levin , agordeev@linux.ibm.com, brueckner@linux.ibm.com, linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 6.6 16/58] s390/traps: Handle early warnings gracefully Date: Fri, 4 Oct 2024 14:23:49 -0400 Message-ID: <20241004182503.3672477-16-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241004182503.3672477-1-sashal@kernel.org> References: <20241004182503.3672477-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.54 Content-Transfer-Encoding: 8bit From: Heiko Carstens [ Upstream commit 3c4d0ae0671827f4b536cc2d26f8b9c54584ccc5 ] Add missing warning handling to the early program check handler. This way a warning is printed to the console as soon as the early console is setup, and the kernel continues to boot. Before this change a disabled wait psw was loaded instead and the machine was silently stopped without giving an idea about what happened. Reviewed-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin --- arch/s390/kernel/early.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 3a54733e4fc65..eb6307c066c8a 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -174,8 +174,21 @@ static __init void setup_topology(void) void __do_early_pgm_check(struct pt_regs *regs) { - if (!fixup_exception(regs)) - disabled_wait(); + struct lowcore *lc = get_lowcore(); + unsigned long ip; + + regs->int_code = lc->pgm_int_code; + regs->int_parm_long = lc->trans_exc_code; + ip = __rewind_psw(regs->psw, regs->int_code >> 16); + + /* Monitor Event? Might be a warning */ + if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) { + if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN) + return; + } + if (fixup_exception(regs)) + return; + disabled_wait(); } static noinline __init void setup_lowcore_early(void) -- 2.43.0