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

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Date:   Tue, 26 May 2020 21:35:33 +0300
From:   "Paraschiv, Andra-Irina" <andraprs@...zon.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 26/05/2020 09:48, Greg KH wrote:
> 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.

This was needed to have an identifier for the overall NE logic - PCI 
dev, ioctl and misc dev.

The ioctl and misc dev logic has pr_* logs, but I can update them to 
dev_* with misc dev, then remove this prefix.

Thank you.

Andra



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