From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2C3C718D621 for ; Mon, 27 Jan 2025 18:29:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738002599; cv=none; b=KeTW3onHEZPGKj2xpThJtD1xPW1wePgiNWiK7liNkYdFk+McwCkeOiuPHAQQWmAYj/CLPkvMvzelIvglgHQS68laxXDWTWsp+e6L2EsURcdFByUw/R3aScQvJ/cQb5hWWJoAZKU6vM/fmozrBHOmMrpic9zvrPz8YguCDXZlDfk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738002599; c=relaxed/simple; bh=UD+we7ElAg8tZM4PJMeQ6tQcyZVHEFVawN5MyHgPdfE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=oca65CSdy458INmHRN0gJcTSgd/TzolYuACsrUIiF4RmIdD5wPJdySVLxogKYYP0kiq2HNUVgbKjdgK03VawPZ2D7dmqwX9koKO29Tgqv0C54m5lAlL8UUVxyBen/VbnUyBR/JaJMtLpk1UGhh35K1/zhN44vTRKNVnK8YXmo6E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=HdZMh+wF; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="HdZMh+wF" Received: from eahariha-devbox.5bhznamrcrmeznzvghz2s0u2eh.xx.internal.cloudapp.net (unknown [40.91.112.99]) by linux.microsoft.com (Postfix) with ESMTPSA id C8A5C2037163; Mon, 27 Jan 2025 10:29:57 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C8A5C2037163 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1738002597; bh=krfdq+MbHBS2tHUA3bAzHezNbS1vSuSKBXsJTNrn+Qg=; h=From:To:Cc:Subject:Date:From; b=HdZMh+wFGEREHjxo46gOBomyAKNQZSSus2EcKxhqYUcgFhbrnah/+CgTDTX0RpFLV OIhEHgeoSQPo0CHHiMS5nVcJgjeiPTDZPtsbey3+tssmivw+x99MlzwgtZMAGKils9 J2Qzd71cEHVPfxRL9iuej7kwMF0lxTR9zAwX9wFQ= From: Easwar Hariharan To: stable@vger.kernel.org Cc: Easwar Hariharan , Michael Kelley , "Martin K . Petersen" Subject: [PATCH 6.12.y] scsi: storvsc: Ratelimit warning logs to prevent VM denial of service Date: Mon, 27 Jan 2025 18:29:54 +0000 Message-ID: <20250127182955.67606-1-eahariha@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit commit d2138eab8cde61e0e6f62d0713e45202e8457d6d upstream If there's a persistent error in the hypervisor, the SCSI warning for failed I/O can flood the kernel log and max out CPU utilization, preventing troubleshooting from the VM side. Ratelimit the warning so it doesn't DoS the VM. Closes: https://github.com/microsoft/WSL/issues/9173 Signed-off-by: Easwar Hariharan Link: https://lore.kernel.org/r/20250107-eahariha-ratelimit-storvsc-v1-1-7fc193d1f2b0@linux.microsoft.com Reviewed-by: Michael Kelley Signed-off-by: Martin K. Petersen Signed-off-by: Easwar Hariharan --- drivers/scsi/storvsc_drv.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index d0b55c1fa908..b3c588b102d9 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -171,6 +171,12 @@ do { \ dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ } while (0) +#define storvsc_log_ratelimited(dev, level, fmt, ...) \ +do { \ + if (do_logging(level)) \ + dev_warn_ratelimited(&(dev)->device, fmt, ##__VA_ARGS__); \ +} while (0) + struct vmscsi_request { u16 length; u8 srb_status; @@ -1177,7 +1183,7 @@ static void storvsc_on_io_completion(struct storvsc_device *stor_device, int loglevel = (stor_pkt->vm_srb.cdb[0] == TEST_UNIT_READY) ? STORVSC_LOGGING_WARN : STORVSC_LOGGING_ERROR; - storvsc_log(device, loglevel, + storvsc_log_ratelimited(device, loglevel, "tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n", scsi_cmd_to_rq(request->cmd)->tag, stor_pkt->vm_srb.cdb[0], -- 2.43.0