From: "Jan Beulich" <JBeulich@suse.com>
To: Tiejun Chen <tiejun.chen@intel.com>
Cc: Wei Liu <wei.liu2@citrix.com>,
Ian Campbell <ian.campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Ian Jackson <ian.jackson@eu.citrix.com>,
xen-devel@lists.xen.org, Keir Fraser <keir@xen.org>
Subject: Re: [v7][PATCH 07/16] hvmloader/e820: construct guest e820 table
Date: Tue, 14 Jul 2015 10:32:00 +0100 [thread overview]
Message-ID: <55A4F3300200007800090868@mail.emea.novell.com> (raw)
In-Reply-To: <55A49C88.2060803@intel.com>
>>> On 14.07.15 at 07:22, <tiejun.chen@intel.com> wrote:
>>> + for ( i = 0; i < memory_map.nr_map; i++ )
>>> + {
>>> + uint64_t end = e820[i].addr + e820[i].size;
>>
>> Either loop index/boundary or used array are wrong here: In the
>> earlier loop you copied memory_map[0...nr_map-1] to
>> e820[n...n+nr_map-1], but here you're looping looking at
>> e820[0...nr_map-1]
>
> You're right. I should lookup all e820[] like this,
>
> for ( i = 0; i < nr; i++ )
Hmm, I would have thought you only care about either part of
the just glued together map.
>>> + if ( e820[i].type == E820_RAM &&
>>> + low_mem_end > e820[i].addr && low_mem_end < end )
>>
>> Assuming you mean to look at the RDM e820[] entries here, this
>> is not a correct check: You don't care about partly or fully
>> contained, all you care about is whether low_mem_end extends
>> beyond the start of the region.
>
> Here I'm looking at the e820 entry indicating low memory. Because
>
> low_mem_end = hvm_info->low_mem_pgend << PAGE_SHIFT;
>
> and when we allocate MMIO in pci.c, its possible to populate RAM so
> hvm_info->low_mem_pgend would be changed over there. So we need to
> compensate this loss with high memory. Here memory_map[] also records
> the original low/high memory, so if low_mem_end is less-than the
> original we need this compensation.
And I'm not disputing your intentions - I'm merely pointing out that
afaics the code above doesn't match these intentions. In particular
(as said) I don't see why you need to check low_mem_end < end.
Jan
next prev parent reply other threads:[~2015-07-14 9:32 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-09 5:33 [v7][PATCH 00/16] Fix RMRR Tiejun Chen
2015-07-09 5:33 ` [v7][PATCH 01/16] xen: introduce XENMEM_reserved_device_memory_map Tiejun Chen
2015-07-09 5:33 ` [v7][PATCH 02/16] xen/vtd: create RMRR mapping Tiejun Chen
2015-07-09 5:33 ` [v7][PATCH 03/16] xen/passthrough: extend hypercall to support rdm reservation policy Tiejun Chen
2015-07-10 13:26 ` George Dunlap
2015-07-10 15:01 ` Jan Beulich
2015-07-10 15:07 ` George Dunlap
2015-07-13 6:37 ` Chen, Tiejun
2015-07-13 5:57 ` Chen, Tiejun
2015-07-13 6:47 ` Chen, Tiejun
2015-07-13 8:57 ` Jan Beulich
2015-07-14 10:46 ` George Dunlap
2015-07-14 10:53 ` Chen, Tiejun
2015-07-14 11:30 ` George Dunlap
2015-07-14 11:45 ` Jan Beulich
2015-07-14 13:25 ` George Dunlap
2015-07-09 5:33 ` [v7][PATCH 04/16] xen: enable XENMEM_memory_map in hvm Tiejun Chen
2015-07-09 5:33 ` [v7][PATCH 05/16] hvmloader: get guest memory map into memory_map[] Tiejun Chen
2015-07-10 13:49 ` George Dunlap
2015-07-13 7:03 ` Chen, Tiejun
2015-07-09 5:33 ` [v7][PATCH 06/16] hvmloader/pci: skip reserved ranges Tiejun Chen
2015-07-13 13:12 ` Jan Beulich
2015-07-14 6:39 ` Chen, Tiejun
2015-07-14 9:27 ` Jan Beulich
2015-07-14 10:54 ` Chen, Tiejun
2015-07-14 11:50 ` Jan Beulich
2015-07-15 0:55 ` Chen, Tiejun
2015-07-15 4:27 ` Chen, Tiejun
2015-07-15 8:34 ` Jan Beulich
2015-07-15 8:59 ` Chen, Tiejun
2015-07-15 9:10 ` Chen, Tiejun
2015-07-15 9:27 ` Jan Beulich
2015-07-15 10:34 ` Chen, Tiejun
2015-07-15 11:25 ` Jan Beulich
2015-07-15 11:34 ` Chen, Tiejun
2015-07-15 13:56 ` George Dunlap
2015-07-15 16:14 ` George Dunlap
2015-07-16 2:05 ` Chen, Tiejun
2015-07-16 9:40 ` George Dunlap
2015-07-16 10:01 ` Chen, Tiejun
2015-07-15 11:05 ` George Dunlap
2015-07-15 11:20 ` Chen, Tiejun
2015-07-15 12:43 ` George Dunlap
2015-07-15 13:23 ` Chen, Tiejun
2015-07-15 11:24 ` Jan Beulich
2015-07-15 11:38 ` George Dunlap
2015-07-15 11:27 ` Jan Beulich
2015-07-15 11:40 ` Chen, Tiejun
2015-07-15 8:32 ` Jan Beulich
2015-07-15 9:04 ` Chen, Tiejun
2015-07-15 12:57 ` Wei Liu
2015-07-15 13:40 ` George Dunlap
2015-07-15 14:00 ` Jan Beulich
2015-07-15 15:19 ` George Dunlap
2015-07-09 5:33 ` [v7][PATCH 07/16] hvmloader/e820: construct guest e820 table Tiejun Chen
2015-07-13 13:35 ` Jan Beulich
2015-07-14 5:22 ` Chen, Tiejun
2015-07-14 9:32 ` Jan Beulich [this message]
2015-07-14 10:22 ` Chen, Tiejun
2015-07-14 10:48 ` Jan Beulich
2015-07-15 16:00 ` George Dunlap
2015-07-16 1:58 ` Chen, Tiejun
2015-07-16 9:41 ` George Dunlap
2015-07-09 5:33 ` [v7][PATCH 08/16] tools/libxc: Expose new hypercall xc_reserved_device_memory_map Tiejun Chen
2015-07-09 5:34 ` [v7][PATCH 09/16] tools: extend xc_assign_device() to support rdm reservation policy Tiejun Chen
2015-07-09 5:34 ` [v7][PATCH 10/16] tools: introduce some new parameters to set rdm policy Tiejun Chen
2015-07-09 9:20 ` Wei Liu
2015-07-09 9:44 ` Chen, Tiejun
2015-07-09 10:37 ` Ian Jackson
2015-07-09 10:53 ` Chen, Tiejun
2015-07-09 18:02 ` Ian Jackson
2015-07-10 0:46 ` Chen, Tiejun
2015-07-09 5:34 ` [v7][PATCH 11/16] tools/libxl: detect and avoid conflicts with RDM Tiejun Chen
2015-07-09 9:11 ` Wei Liu
2015-07-09 9:41 ` Chen, Tiejun
2015-07-09 18:14 ` Ian Jackson
2015-07-10 3:19 ` Chen, Tiejun
2015-07-10 10:14 ` Ian Jackson
2015-07-13 9:19 ` Chen, Tiejun
2015-07-09 5:34 ` [v7][PATCH 12/16] tools: introduce a new parameter to set a predefined rdm boundary Tiejun Chen
2015-07-09 18:14 ` Ian Jackson
2015-07-09 5:34 ` [v7][PATCH 13/16] libxl: construct e820 map with RDM information for HVM guest Tiejun Chen
2015-07-09 18:17 ` Ian Jackson
2015-07-10 5:40 ` Chen, Tiejun
2015-07-10 9:18 ` Ian Campbell
2015-07-13 9:47 ` Chen, Tiejun
2015-07-13 10:15 ` Ian Campbell
2015-07-14 5:44 ` Chen, Tiejun
2015-07-14 7:42 ` Ian Campbell
2015-07-14 8:03 ` Chen, Tiejun
2015-07-10 10:15 ` Ian Jackson
2015-07-09 5:34 ` [v7][PATCH 14/16] xen/vtd: enable USB device assignment Tiejun Chen
2015-07-09 5:34 ` [v7][PATCH 15/16] xen/vtd: prevent from assign the device with shared rmrr Tiejun Chen
2015-07-13 13:41 ` Jan Beulich
2015-07-14 1:42 ` Chen, Tiejun
2015-07-14 9:19 ` Jan Beulich
2015-07-09 5:34 ` [v7][PATCH 16/16] tools: parse to enable new rdm policy parameters Tiejun Chen
2015-07-09 18:23 ` Ian Jackson
2015-07-10 6:05 ` Chen, Tiejun
2015-07-10 10:23 ` Ian Jackson
2015-07-13 9:31 ` Chen, Tiejun
2015-07-13 9:40 ` Ian Campbell
2015-07-13 9:55 ` Chen, Tiejun
2015-07-13 10:17 ` Ian Campbell
2015-07-13 17:08 ` Ian Jackson
2015-07-14 1:29 ` Chen, Tiejun
2015-07-10 14:50 ` [v7][PATCH 00/16] Fix RMRR George Dunlap
2015-07-10 14:56 ` Jan Beulich
2015-07-16 7:55 ` Jan Beulich
2015-07-16 8:03 ` Chen, Tiejun
2015-07-16 8:08 ` Jan Beulich
2015-07-16 8:13 ` Chen, Tiejun
2015-07-16 8:26 ` Jan Beulich
2015-07-16 9:27 ` George Dunlap
2015-07-16 9:44 ` Jan Beulich
2015-07-16 9:59 ` George Dunlap
2015-07-16 8:30 ` Ian Campbell
2015-07-16 8:46 ` Wei Liu
2015-07-16 9:45 ` Lars Kurth
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