linux-kernel - Re: [Xen-devel] [PATCH v3 1/7] xen-pciback: Document the various parameters and attributes in SysFS

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Message-ID: <53BD32C2.6000306@citrix.com>
Date:	Wed, 9 Jul 2014 13:17:06 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	<konrad@...nel.org>, <xen-devel@...ts.xenproject.org>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH v3 1/7] xen-pciback: Document the various
 parameters and attributes in SysFS

On 08/07/14 19:58, konrad@...nel.org wrote:
> From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> 
> Which hadn't been done with the initial commit.
[...]
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-pciback
> @@ -0,0 +1,84 @@
> +What:           /sys//module/xen_pciback/parameters/verbose_request

It's my understanding that module parameters are not typically part of
the ABI.

> +What:           /sys/module/xen_pciback/parameters/permissive
> +Date:           Oct 2011
> +KernelVersion:  3.1
> +Contact:        xen-devel@...ts.xenproject.org
> +Description:
> +                Allow non-emulated (raw) access to PCI configuration space by
> +                the guest frontend. This can have adverse affect as the guest
> +                can destabilize the initial domain.

WTF?  Why does it even have such an unsafe option?


> +What:           /sys/bus/pci/drivers/pciback/irq_handlers
> +Date:           Oct 2011
> +KernelVersion:  3.1
> +Contact:        xen-devel@...ts.xenproject.org
> +Description:
> +                A list of all of the PCI devices owned by Xen PCI back and
> +                whether Xen PCI backend will acknowledge the interrupts received
> +                and the amount of interrupts received. Xen PCI back acknowledges
> +                said interrupts only when they are level, shared with another
> +                guest, and enabled by the guest.

This should be a device property or something in debugfs.

> +What:           /sys/bus/pci/drivers/pciback/irq_handler_state
> +Date:           Oct 2011
> +KernelVersion:  3.1
> +Contact:        xen-devel@...ts.xenproject.org
> +Description:
> +                An option to toggle Xen PCI back to acknowledge (or stop)
> +                interrupts for the specific device regardless of whether the
> +                device is shared, enabled, or on a level interrupt line.
> +                Writing a string of DDDD:BB:DD.F will toggle the state.
> +                This is Domain:Bus:Device.Function where domain is optional.

I do not understand under what circumstances this should be used in.

David

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