From: Jan Beulich <jbeulich@suse.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
xen-devel@lists.xenproject.org, "Wei Liu" <wl@xen.org>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v3 4/5] x86/boot: Copy 16-bit boot variables back up to Xen image
Date: Mon, 2 Sep 2019 16:10:37 +0200 [thread overview]
Message-ID: <c654326d-f875-8227-b4d7-bf9399c0bdfb@suse.com> (raw)
In-Reply-To: <ecd28e008684e723bf9680419acba3b377206c94.camel@infradead.org>
On 02.09.2019 15:52, David Woodhouse wrote:
> On Mon, 2019-09-02 at 15:47 +0200, Jan Beulich wrote:
>> On 02.09.2019 14:51, David Woodhouse wrote:
>>> On Mon, 2019-09-02 at 09:44 +0200, Jan Beulich wrote:
>>>> Right, just one pair should survive. And seeing how things work before
>>>> this series I think it indeed should be linker script symbols only.
>>>> And then the ALIGN() ahead of the "start" ones should stay, but there's
>>>> no need for one on the "end" ones (again as is currently the case).
>>>
>>> If we don't align the end symbol then we need to go back to rounding up
>>> the length with ((boot_trampoline_end - boot_trampoline_start) + 3) / 4
>>> again though, right?
>>
>> Wait - we've been talking about the *_rel sections / tables here,
>> haven't we? All entries of these tables ought to be of equal size,
>> and hence alignment of a table's "end" label automatically matches
>> the size of the table entries.
>
> The specific one we were taking about just then was
> bootdata_{start,end} which is the data itself to be copied up/down, not
> the relocations.
Oh, I'm sorry then for mixing things up.
> The _rel sections indeed need no alignment at the end, as you say.
Right; and I agree the non-*_rel one wants its "end" label aligned.
Jan
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next prev parent reply other threads:[~2019-09-02 14:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-21 16:35 [Xen-devel] [PATCH v3 0/5] Clean up x86_64 boot code David Woodhouse
2019-08-21 16:35 ` [Xen-devel] [PATCH v3 1/5] x86/boot: Only jump into low trampoline code for real-mode boot David Woodhouse
2019-08-21 16:35 ` [Xen-devel] [PATCH v3 2/5] x86/boot: Split bootsym() into four types of relocations David Woodhouse
2019-08-30 15:10 ` Jan Beulich
2019-08-30 16:12 ` David Woodhouse
2019-09-02 7:37 ` Jan Beulich
2019-08-21 16:35 ` [Xen-devel] [PATCH v3 3/5] x86/boot: Rename trampoline_{start, end} to boot_trampoline_{start, end} David Woodhouse
2019-08-21 16:35 ` [Xen-devel] [PATCH v3 4/5] x86/boot: Copy 16-bit boot variables back up to Xen image David Woodhouse
2019-08-30 15:43 ` Jan Beulich
2019-08-30 16:25 ` David Woodhouse
2019-09-02 7:44 ` Jan Beulich
2019-09-02 12:51 ` David Woodhouse
2019-09-02 13:47 ` Jan Beulich
2019-09-02 13:52 ` David Woodhouse
2019-09-02 14:10 ` Jan Beulich [this message]
2019-08-21 16:35 ` [Xen-devel] [PATCH v3 5/5] x86/boot: Do not use trampoline for no-real-mode boot paths David Woodhouse
2019-09-02 8:54 ` Jan Beulich
2019-08-30 14:25 ` [Xen-devel] [PATCH v3 1/5] x86/boot: Only jump into low trampoline code for real-mode boot Jan Beulich
2019-08-30 14:28 ` David Woodhouse
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