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

[Paraschiv, Andra-Irina]

On 27/05/2020 01:19, Greg KH wrote:
> On Tue, May 26, 2020 at 09:35:33PM +0300, Paraschiv, Andra-Irina wrote:
> > 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@xxxxxxxxxx>
> > > > Signed-off-by: Alexandru Ciobotaru <alcioa@xxxxxxxxxx>
> > > > Signed-off-by: Andra Paraschiv <andraprs@xxxxxxxxxx>
> > > > ---
> > > > 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.
> Why?  They are all different "devices", and refer to different
> interfaces.  Stick to what the dev_* gives you for them.  You probably
> want to stick with the pci dev for almost all of those anyway.
>
> > The ioctl and misc dev logic has pr_* logs, but I can update them to dev_*
> > with misc dev, then remove this prefix.
> That would be good, thanks.

That's already in v4, the pr_* logs are now replaced with dev_*.

Thanks,
Andra



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