From: David Laight <David.Laight@ACULAB.COM>
To: "'Kasireddy, Vivek'" <vivek.kasireddy@intel.com>,
David Hildenbrand <david@redhat.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
Hugh Dickins <hughd@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>,
"Kim, Dongwon" <dongwon.kim@intel.com>,
"Chang, Junxiao" <junxiao.chang@intel.com>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>,
"Hocko, Michal" <mhocko@suse.com>,
"jmarchan@redhat.com" <jmarchan@redhat.com>,
"muchun.song@linux.dev" <muchun.song@linux.dev>,
James Houghton <jthoughton@google.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH] udmabuf: revert 'Add support for mapping hugepages (v4)'
Date: Tue, 13 Jun 2023 12:25:03 +0000 [thread overview]
Message-ID: <89652021ecea4aa2ada763c97deeb543@AcuMS.aculab.com> (raw)
In-Reply-To: <IA0PR11MB71852D6B27C83658670CBFBDF855A@IA0PR11MB7185.namprd11.prod.outlook.com>
From: Kasireddy, Vivek <vivek.kasireddy@intel.com>
> Sent: 13 June 2023 09:26
...
> > Is my understanding correct, that we can effectively long-term pin
> > (worse than mlock) 64 MiB per UDMABUF_CREATE, allowing eventually !root
> > users
>
> The 64 MiB limit is the theoretical upper bound that we have not seen hit in
> practice. Typically, for a 1920x1080 resolution (commonly used in Guests),
> the size of the FB is ~8 MB (1920x1080x4). And, most modern Graphics
> compositors flip between two FBs.
What code does and what potentially malicious code might do
are entirely different things.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2023-06-13 12:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-08 20:49 [PATCH] udmabuf: revert 'Add support for mapping hugepages (v4)' Mike Kravetz
2023-06-09 6:09 ` Greg Kroah-Hartman
2023-06-12 7:10 ` Kasireddy, Vivek
2023-06-12 7:46 ` David Hildenbrand
2023-06-13 8:26 ` Kasireddy, Vivek
2023-06-13 12:25 ` David Laight [this message]
2023-06-13 17:51 ` David Hildenbrand
2023-06-14 3:40 ` Hugh Dickins
2023-06-14 7:51 ` Kasireddy, Vivek
2023-06-15 9:48 ` David Hildenbrand
2023-06-19 12:35 ` Gerd Hoffmann
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