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From: Paul Durrant <Paul.Durrant@citrix.com>
To: Andrew Cooper <Andrew.Cooper3@citrix.com>,
	Roman Shaposhnik <roman@zededa.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Wei Liu <wl@xen.org>, Jan Beulich <JBeulich@suse.com>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx
Date: Mon, 22 Jul 2019 08:03:06 +0000	[thread overview]
Message-ID: <d7006feb950942fba93fa9e9c13882d9@AMSPEX02CL03.citrite.net> (raw)
In-Reply-To: <8afa7ab1-f5cf-e954-f4de-744de851229e@citrix.com>

De-htmling...

-----
[snip]
For RMRRs themselves, system firmware is well known for abiding by the spec [citation needed], but an RMRR must be honoured, because the entire purpose of them is to state "this device won't function without access to this area".

An RMRR in a hole, while a violation of the spec, is obviously fine to use in practice, so we should just accept it and stop complaining.

OTOH, RMRRs which hit other memory (particularly RAM) need more care, and probably want to force override the e820 to reserved.  Nothing good will come from trusting the e820 over the DMAR table here, seeing as there is clearly an error somewhere in the firmware-provided information.

However - I'm struggling to locate anywhere which actually walks dom0's RMRR list and inserts them into the IOMMU.  Anyone got any hints?
-----

I think you want setup_hwdom_rmrr() in passthrough/vtd/iommu.c

  Paul
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  reply	other threads:[~2019-07-22  8:03 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-19 19:31 [Xen-devel] [BUG] After upgrade to Xen 4.12.0 iommu=no-igfx Roman Shaposhnik
2019-07-19 20:02 ` Roman Shaposhnik
2019-07-22  8:20   ` Paul Durrant
2019-07-22 11:48     ` Roger Pau Monné
2019-07-22 11:54       ` Paul Durrant
2019-07-22 13:48         ` Roger Pau Monné
2019-07-22 14:03           ` Paul Durrant
2019-07-22 14:39             ` Roger Pau Monné
2019-07-22 15:02               ` Paul Durrant
2019-07-22 15:21                 ` Roger Pau Monné
2019-07-22 23:36                   ` Roman Shaposhnik
2019-07-22 23:47                     ` Andrew Cooper
2019-07-23 17:32                       ` Roman Shaposhnik
2019-07-23 17:35                         ` Andrew Cooper
2019-07-23 17:48                           ` Roman Shaposhnik
2019-07-23 17:50                             ` Andrew Cooper
2019-07-23 17:58                               ` Roman Shaposhnik
2019-07-23 18:12                                 ` Andrew Cooper
2019-07-23 18:25                                   ` Roman Shaposhnik
2019-07-26  7:58                                     ` Jan Beulich
2019-07-30 17:56                                       ` Roman Shaposhnik
2019-07-31  8:34                                         ` Jan Beulich
2019-07-31  8:58                                           ` Andrew Cooper
2019-07-31  9:30                                             ` Jan Beulich
2019-07-31 19:37                                               ` Roman Shaposhnik
2019-07-24 12:00                                 ` Jan Beulich
2019-07-24 12:04                                   ` Jan Beulich
2019-07-24 11:23                         ` Andrew Cooper
2019-07-24 11:40                           ` Andrew Cooper
2019-07-24 14:11                         ` Roger Pau Monné
2019-07-26  0:47                           ` Roman Shaposhnik
2019-07-26  9:35                             ` Roger Pau Monné
2019-07-30  9:21                               ` Roger Pau Monné
2019-07-30 17:55                                 ` Roman Shaposhnik
2019-07-31  8:31                                   ` Jan Beulich
2019-07-31  8:36                                   ` Roger Pau Monné
2019-07-31  8:43                                     ` Roger Pau Monné
2019-07-31 19:35                                       ` Roman Shaposhnik
2019-07-31 19:46                                         ` Andrew Cooper
2019-07-31 21:03                                           ` Roman Shaposhnik
2019-08-01  8:15                                             ` Roger Pau Monné
2019-08-01 18:25                                               ` Roman Shaposhnik
2019-08-02  8:05                                                 ` Roger Pau Monné
2019-08-06 16:17                                                   ` Roger Pau Monné
2019-08-06 21:48                                                     ` Roman Shaposhnik
2019-08-07  7:08                                                       ` Jan Beulich
2019-08-07  9:57                                                         ` Roger Pau Monné
2019-08-07 10:03                                                           ` Jan Beulich
2019-08-07  7:35                                                       ` Roger Pau Monné
2019-08-07  8:31                                                         ` Jan Beulich
2019-08-07 10:17                                                           ` Roger Pau Monné
2019-08-12  8:57                                                         ` Roger Pau Monné
2019-08-13 19:24                                                           ` Roman Shaposhnik
2019-08-14  8:06                                                             ` Roger Pau Monné
2019-08-19  5:00                                                               ` Roman Shaposhnik
2019-08-19  8:16                                                                 ` Roger Pau Monné
2019-08-20  2:03                                                                   ` Roman Shaposhnik
2019-08-01  7:35                                           ` Jan Beulich
2019-07-31 19:30                                     ` Roman Shaposhnik
2019-08-01  8:45                                       ` Roger Pau Monné
2019-08-01 18:19                                         ` Roman Shaposhnik
2019-07-20 16:39 ` Andrew Cooper
2019-07-22  8:03   ` Paul Durrant [this message]
2019-07-24 17:42 ` Rich Persaud
2019-07-26  1:13   ` Roman Shaposhnik

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