Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Thu, 16 Jun 2022 12:08:55 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Sebastian Ene <sebastianene@google.com>
Cc:     Rob Herring <robh+dt@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Dragan Cvetic <dragan.cvetic@xilinx.com>,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        maz@kernel.org, will@kernel.org, vdonnefort@google.com,
        Guenter Roeck <linux@roeck-us.net>,
        kernel test robot <lkp@intel.com>
Subject: Re: [PATCH v6 2/2] misc: Add a mechanism to detect stalls on guest
 vCPUs
Message-ID: <YqsBN2qtjCkNtVM0@kroah.com>
References: <20220616092737.1713667-1-sebastianene@google.com>
 <20220616092737.1713667-3-sebastianene@google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20220616092737.1713667-3-sebastianene@google.com>
Precedence: bulk

On Thu, Jun 16, 2022 at 09:27:39AM +0000, Sebastian Ene wrote:
> This driver creates per-cpu hrtimers which are required to do the
> periodic 'pet' operation. On a conventional watchdog-core driver, the
> userspace is responsible for delivering the 'pet' events by writing to
> the particular /dev/watchdogN node. In this case we require a strong
> thread affinity to be able to account for lost time on a per vCPU.
> 
> This part of the driver is the 'frontend' which is reponsible for
> delivering the periodic 'pet' events, configuring the virtual peripheral
> and listening for cpu hotplug events. The other part of the driver
> handles the peripheral emulation and this part accounts for lost time by
> looking at the /proc/{}/task/{}/stat entries and is located here:
> https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3548817
> 
> Reported-by: kernel test robot <lkp@intel.com>

The robot reported stalls on vcpus?

I think you need to fix this up...

greg k-h