From: "Jan Beulich" <JBeulich@suse.com>
To: Konrad Rzeszutek Wilk <konrad@kernel.org>
Cc: sstabellini@kernel.org, Keir Fraser <keir@xen.org>,
andrew.cooper3@citrix.com, mpohlack@amazon.com,
ross.lagerwall@citrix.com, julien.grall@arm.com,
sasha.levin@oracle.com, xen-devel@lists.xenproject.org
Subject: Re: [PATCH v8.1 11/27] xsplice: Implement payload loading
Date: Thu, 21 Apr 2016 00:41:58 -0600 [thread overview]
Message-ID: <5718925602000078000E434A@prv-mh.provo.novell.com> (raw)
In-Reply-To: <CACJDEmoB3VZBw=5Trv3_9=v-oUhrb=L2ShbEJxdQpoK=TWuxag@mail.gmail.com>
>>> On 20.04.16 at 19:36, <konrad@kernel.org> wrote:
> On Apr 20, 2016 6:05 PM, "Jan Beulich" <jbeulich@suse.com> wrote:
>>
>> >>> Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 04/20/16 6:00 PM >>>
>> >> >+ size_t pages; /* Total pages for [text,rw,ro]_addr */
>> >>
>> >> Why size_t and not just unsigned int?
>> >
>> >Oh. I was somehow under the impression you liked size_t more than
>> >unsignged int! I will change it over.
>>
>> When used where actually talking about sizes, I indeed prefer size_t. But
>> here we have a count which we know will be much lower than UINT_MAX.
>>
>> >> >+static void calc_section(struct xsplice_elf_sec *sec, size_t *size)
>> >> >+{
>> >> >+ Elf_Shdr *s = sec->sec;
>> >> >+ size_t align_size;
>> >> >+
>> >> >+ align_size = ROUNDUP(*size, s->sh_addralign);
>> >> >+ s->sh_entsize = align_size;
>> >>
>> >> So this is one of the places (the only one?) where the section header gets
>> >> altered. Are you not expecting problems down the road resulting from
>> >> overwriting this field? After all it's used not just in control sections...
>> >
>> >The 'man elf' tells me :
>> >"Some sections hold a table of fixed-sized entries, such as a symbol
>> >table. For such a section, this member gives the size in bytes for each entry.
>> >This member contains zero if the section does not hold a table of
>> >fixed-size entries."
>>
>> My main concern is that SHF_MERGE sections (i.e. ordinary data ones) also
>> already use this field.
>
> OK. Let me add the 'offset' member (in xsplice_elf_sec) to store the value.
>
> Albeit it only gets used during move_payload. And later that offset value
> can easily computed using ->load_addr minus ->data.
>
> Perhaps I should introduce an temporary array to hold this value instead?
Whichever is more feasible / less convoluted, I would say.
Jan
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-04-21 6:42 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-13 22:01 [PATCH v8.1] xSplice v1 design and implementation Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 01/27] Revert "libxc/libxl/python/xenstat/ocaml: Use new XEN_VERSION hypercall" Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 02/27] Revert "HYPERCALL_version_op. New hypercall mirroring XENVER_ but sane." Konrad Rzeszutek Wilk
2016-04-14 16:14 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 03/27] xsplice: Design document Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 04/27] xen/xsplice: Hypervisor implementation of XEN_XSPLICE_op Konrad Rzeszutek Wilk
2016-04-14 16:36 ` Jan Beulich
2016-04-15 2:28 ` Konrad Rzeszutek Wilk
2016-04-17 8:05 ` Jan Beulich
2016-04-18 7:48 ` Konrad Rzeszutek Wilk
2016-04-18 16:33 ` Jan Beulich
2016-04-19 10:14 ` Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 05/27] libxc: Implementation of XEN_XSPLICE_op in libxc Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 06/27] xen-xsplice: Tool to manipulate xsplice payloads Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 07/27] arm/x86: Use struct virtual_region to do bug, symbol, and (x86) exception tables lookup Konrad Rzeszutek Wilk
2016-04-14 16:50 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 08/27] arm/x86/vmap: Add vmalloc_xen, vfree_xen and vm_init_type Konrad Rzeszutek Wilk
2016-04-17 20:17 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 09/27] x86/mm: Introduce modify_xen_mappings() Konrad Rzeszutek Wilk
2016-04-14 4:07 ` Jan Beulich
2016-04-14 13:34 ` Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 10/27] xsplice: Add helper elf routines Konrad Rzeszutek Wilk
2016-04-17 20:55 ` Jan Beulich
2016-04-18 5:53 ` Konrad Rzeszutek Wilk
2016-04-18 6:23 ` Jan Beulich
2016-04-20 16:07 ` Konrad Rzeszutek Wilk
2016-04-20 16:59 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 11/27] xsplice: Implement payload loading Konrad Rzeszutek Wilk
2016-04-18 6:16 ` Jan Beulich
2016-04-20 15:59 ` Konrad Rzeszutek Wilk
2016-04-20 17:05 ` Jan Beulich
2016-04-20 17:36 ` Konrad Rzeszutek Wilk
2016-04-21 6:41 ` Jan Beulich [this message]
2016-04-21 15:15 ` Konrad Rzeszutek Wilk
2016-04-21 15:36 ` Jan Beulich
2016-04-21 16:47 ` Konrad Rzeszutek Wilk
2016-04-22 7:40 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 12/27] xsplice: Implement support for applying/reverting/replacing patches Konrad Rzeszutek Wilk
2016-04-19 6:27 ` Jan Beulich
2016-04-21 0:28 ` Konrad Rzeszutek Wilk
2016-04-21 6:44 ` Jan Beulich
2016-04-21 20:27 ` Konrad Rzeszutek Wilk
2016-04-22 7:44 ` Jan Beulich
2016-04-22 10:51 ` Konrad Rzeszutek Wilk
2016-04-22 17:26 ` Konrad Rzeszutek Wilk
2016-04-25 7:55 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 13/27] x86/xen_hello_world.xsplice: Test payload for patching 'xen_extra_version' Konrad Rzeszutek Wilk
2016-04-19 17:40 ` Jan Beulich
2016-04-20 16:10 ` Konrad Rzeszutek Wilk
2016-04-20 17:06 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 14/27] xsplice, symbols: Implement symbol name resolution on address Konrad Rzeszutek Wilk
2016-04-19 19:31 ` Jan Beulich
2016-04-20 12:55 ` Ross Lagerwall
2016-04-21 0:26 ` Konrad Rzeszutek Wilk
2016-04-21 6:46 ` Jan Beulich
[not found] ` <CACJDEmrucgYZpCDv3EAkDJUOtdcP9P2T=Vine1o2pzUmwJDY1w@mail.gmail.com>
[not found] ` <CACJDEmrzieYh6__MHJH_okoZPk+RA56PuQKv-oid0j1t1po1oQ@mail.gmail.com>
[not found] ` <CACJDEmrdi3sTZjGowkvGP67-_DH3+TLvArC8qZfArsyPb6fpuA@mail.gmail.com>
[not found] ` <CACJDEmrQ6onv-xqYOi3nekioCSASb4c1eZHJ-rzMxU3Wa7SXTQ@mail.gmail.com>
2016-04-21 13:56 ` Konrad Rzeszutek Wilk
2016-04-21 14:25 ` Jan Beulich
2016-04-22 7:17 ` Ross Lagerwall
2016-04-22 7:51 ` Jan Beulich
2016-04-22 8:45 ` Ross Lagerwall
2016-04-22 10:08 ` Jan Beulich
2016-04-22 10:28 ` Konrad Rzeszutek Wilk
2016-04-22 10:50 ` Jan Beulich
2016-04-22 11:08 ` Konrad Rzeszutek Wilk
2016-04-22 11:18 ` Jan Beulich
2016-04-24 21:41 ` Konrad Rzeszutek Wilk
2016-04-25 8:02 ` Jan Beulich
2016-04-22 11:13 ` Ross Lagerwall
2016-04-22 11:24 ` Jan Beulich
2016-04-22 21:10 ` Konrad Rzeszutek Wilk
2016-04-25 6:41 ` Ross Lagerwall
2016-04-25 8:15 ` Jan Beulich
2016-04-22 14:17 ` Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 15/27] xsplice, symbols: Implement fast symbol names -> virtual addresses lookup Konrad Rzeszutek Wilk
2016-04-19 19:52 ` Jan Beulich
2016-04-22 15:21 ` Konrad Rzeszutek Wilk
2016-04-25 8:38 ` Jan Beulich
2016-04-25 14:12 ` Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 16/27] x86, xsplice: Print payload's symbol name and payload name in backtraces Konrad Rzeszutek Wilk
2016-04-19 20:09 ` Jan Beulich
2016-04-13 22:01 ` [PATCH v8.1 17/27] xsplice: Add support for bug frames Konrad Rzeszutek Wilk
2016-04-19 20:17 ` Jan Beulich
2016-04-21 0:29 ` Konrad Rzeszutek Wilk
2016-04-21 6:49 ` Jan Beulich
2016-04-22 10:10 ` Konrad Rzeszutek Wilk
2016-04-22 10:28 ` Jan Beulich
2016-04-22 10:54 ` Konrad Rzeszutek Wilk
2016-04-22 10:58 ` Jan Beulich
2016-04-22 11:10 ` Konrad Rzeszutek Wilk
2016-04-13 22:01 ` [PATCH v8.1 18/27] xsplice: Add support for exception tables Konrad Rzeszutek Wilk
2016-04-19 20:31 ` Jan Beulich
2016-04-13 22:02 ` [PATCH v8.1 19/27] xsplice: Add support for alternatives Konrad Rzeszutek Wilk
2016-04-20 6:28 ` Jan Beulich
2016-04-21 0:30 ` Konrad Rzeszutek Wilk
2016-04-21 6:55 ` Jan Beulich
2016-04-21 0:31 ` Konrad Rzeszutek Wilk
2016-04-21 6:56 ` Jan Beulich
2016-04-22 16:06 ` Konrad Rzeszutek Wilk
2016-04-13 22:02 ` [PATCH v8.1 20/27] build_id: Provide ld-embedded build-ids Konrad Rzeszutek Wilk
2016-04-20 7:14 ` Jan Beulich
2016-04-21 0:33 ` Konrad Rzeszutek Wilk
2016-04-21 6:59 ` Jan Beulich
2016-04-21 20:30 ` Konrad Rzeszutek Wilk
2016-04-22 16:16 ` Konrad Rzeszutek Wilk
2016-04-13 22:02 ` [PATCH v8.1 21/27] xsplice: Print build_id in keyhandler and on bootup Konrad Rzeszutek Wilk
2016-04-13 22:02 ` [PATCH v8.1 22/27] XENVER_build_id/libxc: Provide ld-embedded build-id Konrad Rzeszutek Wilk
2016-04-14 15:03 ` Wei Liu
2016-04-14 15:04 ` Daniel De Graaf
2016-04-20 7:19 ` Jan Beulich
2016-04-13 22:02 ` [PATCH v8.1 23/27] libxl: info: Display build_id of the hypervisor Konrad Rzeszutek Wilk
2016-04-14 15:06 ` Wei Liu
2016-04-13 22:02 ` [PATCH v8.1 24/27] xsplice: Stacking build-id dependency checking Konrad Rzeszutek Wilk
2016-04-20 7:49 ` Jan Beulich
2016-04-22 10:46 ` Konrad Rzeszutek Wilk
2016-04-22 10:55 ` Jan Beulich
2016-04-13 22:02 ` [PATCH v8.1 25/27] xsplice/xen_replace_world: Test-case for XSPLICE_ACTION_REPLACE Konrad Rzeszutek Wilk
2016-04-20 11:12 ` Jan Beulich
2016-04-13 22:02 ` [PATCH v8.1 26/27] xsplice: Prevent duplicate payloads from being loaded Konrad Rzeszutek Wilk
2016-04-20 11:16 ` Jan Beulich
2016-04-13 22:02 ` [PATCH v8.1 27/27] MAINTAINERS/xsplice: Add myself and Ross as the maintainers Konrad Rzeszutek Wilk
2016-04-14 14:26 ` [PATCH v8.1] xSplice v1 design and implementation Konrad Rzeszutek Wilk
2016-04-14 14:29 ` Julien Grall
2016-04-14 15:12 ` Andrew Cooper
2016-04-14 15:17 ` Jan Beulich
2016-04-15 0:55 ` Konrad Rzeszutek Wilk
2016-04-17 8:00 ` Jan Beulich
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5718925602000078000E434A@prv-mh.provo.novell.com \
--to=jbeulich@suse.com \
--cc=andrew.cooper3@citrix.com \
--cc=julien.grall@arm.com \
--cc=keir@xen.org \
--cc=konrad@kernel.org \
--cc=mpohlack@amazon.com \
--cc=ross.lagerwall@citrix.com \
--cc=sasha.levin@oracle.com \
--cc=sstabellini@kernel.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).