linux-kernel - Re: [PATCH V3 3/3] platform/x86: Intel PMT Telemetry capability driver

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Message-ID: <245ecc65a839bd69413045ae5ee307ba03ca0869.camel@linux.intel.com>
Date:   Wed, 15 Jul 2020 16:59:02 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        lee.jones@...aro.org, dvhart@...radead.org, andy@...radead.org,
        bhelgaas@...gle.com, alexander.h.duyck@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH V3 3/3] platform/x86: Intel PMT Telemetry capability
 driver

On Wed, 2020-07-15 at 10:39 +0300, Alexey Budankov wrote:
> Hi David,
> 
> On 14.07.2020 9:23, David E. Box wrote:

...

> > 
> > +static int pmt_telem_open(struct inode *inode, struct file *filp)
> > +{
> > +	struct pmt_telem_priv *priv;
> > +	struct pmt_telem_entry *entry;
> > +	struct pci_driver *pci_drv;
> > +	struct pci_dev *pci_dev;
> > +
> > +	if (!capable(CAP_SYS_ADMIN))
> 
> Thanks for supplying these patches.
> Are there any reasons not to expose this feature to CAP_PERFMON
> privileged
> processes too that currently have access to performance monitoring
> features
> of the kernel without root/CAP_SYS_ADMIN credentials? This could be
> done by
> pefmon_capable() function call starting from v5.8+.

The new capability is well suited for this feature. I'll make the
change. Thanks.

David