linux-kernel - Re: [PATCH v3 04/18] nitro_enclaves: Init PCI device driver

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Message-ID: <20200526064819.GC2580530@kroah.com>
Date:   Tue, 26 May 2020 08:48:19 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Andra Paraschiv <andraprs@...zon.com>
Cc:     linux-kernel@...r.kernel.org,
        Anthony Liguori <aliguori@...zon.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Colm MacCarthaigh <colmmacc@...zon.com>,
        Bjoern Doebel <doebel@...zon.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Frank van der Linden <fllinden@...zon.com>,
        Alexander Graf <graf@...zon.de>,
        Martin Pohlack <mpohlack@...zon.de>,
        Matt Wilson <msw@...zon.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Balbir Singh <sblbir@...zon.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stewart Smith <trawets@...zon.com>,
        Uwe Dannowski <uwed@...zon.de>, kvm@...r.kernel.org,
        ne-devel-upstream@...zon.com
Subject: Re: [PATCH v3 04/18] nitro_enclaves: Init PCI device driver

On Tue, May 26, 2020 at 01:13:20AM +0300, Andra Paraschiv wrote:
> The Nitro Enclaves PCI device is used by the kernel driver as a means of
> communication with the hypervisor on the host where the primary VM and
> the enclaves run. It handles requests with regard to enclave lifetime.
> 
> Setup the PCI device driver and add support for MSI-X interrupts.
> 
> Signed-off-by: Alexandru-Catalin Vasile <lexnv@...zon.com>
> Signed-off-by: Alexandru Ciobotaru <alcioa@...zon.com>
> Signed-off-by: Andra Paraschiv <andraprs@...zon.com>
> ---
> Changelog
> 
> v2 -> v3
> 
> * Remove the GPL additional wording as SPDX-License-Identifier is already in
> place.
> * Remove the WARN_ON calls.
> * Remove linux/bug include that is not needed.
> * Update static calls sanity checks.
> * Remove "ratelimited" from the logs that are not in the ioctl call paths.
> * Update kzfree() calls to kfree().
> 
> v1 -> v2
> 
> * Add log pattern for NE.
> * Update PCI device setup functions to receive PCI device data structure and
> then get private data from it inside the functions logic.
> * Remove the BUG_ON calls.
> * Add teardown function for MSI-X setup.
> * Update goto labels to match their purpose.
> * Implement TODO for NE PCI device disable state check.
> * Update function name for NE PCI device probe / remove.
> ---
>  drivers/virt/nitro_enclaves/ne_pci_dev.c | 252 +++++++++++++++++++++++
>  1 file changed, 252 insertions(+)
>  create mode 100644 drivers/virt/nitro_enclaves/ne_pci_dev.c
> 
> diff --git a/drivers/virt/nitro_enclaves/ne_pci_dev.c b/drivers/virt/nitro_enclaves/ne_pci_dev.c
> new file mode 100644
> index 000000000000..0b66166787b6
> --- /dev/null
> +++ b/drivers/virt/nitro_enclaves/ne_pci_dev.c
> @@ -0,0 +1,252 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
> + */
> +
> +/* Nitro Enclaves (NE) PCI device driver. */
> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/list.h>
> +#include <linux/mutex.h>
> +#include <linux/module.h>
> +#include <linux/nitro_enclaves.h>
> +#include <linux/pci.h>
> +#include <linux/types.h>
> +#include <linux/wait.h>
> +
> +#include "ne_misc_dev.h"
> +#include "ne_pci_dev.h"
> +
> +#define DEFAULT_TIMEOUT_MSECS (120000) /* 120 sec */
> +
> +#define NE "nitro_enclaves: "

Why is this needed?  The dev_* functions should give you all the
information that you need to properly describe the driver and device in
question.  No extra "prefixes" should be needed at all.

thanks,

greg k-h