linux-kernel - Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support

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Message-ID: <56162D66.2030205@scylladb.com>
Date:	Thu, 8 Oct 2015 11:46:30 +0300
From:	Avi Kivity <avi@...lladb.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	Vlad Zolotarov <vladz@...udius-systems.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, hjk@...sjkoch.de, corbet@....net,
	bruce.richardson@...el.com, avi@...udius-systems.com,
	gleb@...udius-systems.com, stephen@...workplumber.org,
	alexander.duyck@...il.com
Subject: Re: [PATCH v3 2/3] uio_pci_generic: add MSI/MSI-X support



On 10/08/2015 10:32 AM, Michael S. Tsirkin wrote:
> On Thu, Oct 08, 2015 at 08:33:45AM +0300, Avi Kivity wrote:
>> It is good practice to defend against root oopsing the kernel, but in some
>> cases it cannot be achieved.
> Absolutely. That's one of the issues with these patches. They don't even
> try where it's absolutely possible.
>

Are you referring to blocking the maps of the msix BAR areas?

I think there is value in that.  The value is small, because a 
corruption is more likely in the dynamic memory responsible for tens of 
millions of DMA operations per second, rather than a static 4K area, but 
it exists.
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