From: Julien Grall <julien@xen.org>
To: Oleksii <oleksii.kurochko@gmail.com>, xen-devel@lists.xenproject.org
Cc: Jan Beulich <jbeulich@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Gianluca Guida <gianluca@rivosinc.com>,
Bertrand Marquis <bertrand.marquis@arm.com>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: Re: [PATCH v3 3/4] xen/arm: switch ARM to use generic implementation of bug.h
Date: Tue, 28 Feb 2023 17:48:57 +0000 [thread overview]
Message-ID: <46e96dd9-bcb4-4569-b282-05c019cabcc3@xen.org> (raw)
In-Reply-To: <c0e628d744f03c70d2e7b66540ea27aa31d90043.camel@gmail.com>
Hi Oleksii,
On 28/02/2023 15:09, Oleksii wrote:
> On Sat, 2023-02-25 at 16:49 +0000, Julien Grall wrote:
>> Hi Oleksii,
>>
>> On 24/02/2023 11:31, Oleksii Kurochko wrote:
>>> The following changes were made:
>>> * make GENERIC_BUG_FRAME mandatory for ARM
>>
>> I have asked in patch #1 but will ask it again because I think this
>> should be recorded in the commit message. Can you outline why it is
>> not
>> possible to completely switch to the generic version?
> I haven't tried to switch ARM too because of comment regarding 'i' in
> <asm/bug.h>:
> /*
> * GCC will not allow to use "i" when PIE is enabled (Xen doesn't set
> the
> * flag but instead rely on the default value from the compiler). So
> the
> * easiest way to implement run_in_exception_handler() is to pass the
> to
> * be called function in a fixed register.
> */
I would expect this comment to be valid for any arch. So if there is a
need to deal with PIE, then we would not be able to use "i" in the BUG
frame.
Note that we are now explicitly compiling Xen without PIE (see Config.mk).
Cheers,
--
Julien Grall
next prev parent reply other threads:[~2023-02-28 17:49 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-24 11:31 [PATCH v3 0/4] introduce generic implementation of macros from bug.h Oleksii Kurochko
2023-02-24 11:31 ` [PATCH v3 1/4] xen: introduce CONFIG_GENERIC_BUG_FRAME Oleksii Kurochko
2023-02-25 16:42 ` Julien Grall
2023-02-27 9:48 ` Jan Beulich
2023-02-28 17:21 ` Oleksii
2023-02-28 18:01 ` Julien Grall
2023-02-28 20:24 ` Oleksii
2023-02-27 14:23 ` Jan Beulich
2023-02-28 10:30 ` Oleksii
2023-02-28 10:42 ` Jan Beulich
2023-02-24 11:31 ` [PATCH v3 2/4] xen: change <asm/bug.h> to <xen/bug.h> Oleksii Kurochko
2023-02-25 16:47 ` Julien Grall
2023-02-28 12:38 ` Oleksii
2023-02-28 14:04 ` Julien Grall
2023-02-28 13:07 ` Oleksii
2023-02-28 13:30 ` Jan Beulich
2023-02-28 16:00 ` Oleksii
2023-02-27 14:29 ` Jan Beulich
2023-02-28 13:14 ` Oleksii
2023-02-24 11:31 ` [PATCH v3 3/4] xen/arm: switch ARM to use generic implementation of bug.h Oleksii Kurochko
2023-02-25 16:49 ` Julien Grall
2023-02-25 17:05 ` Julien Grall
2023-02-28 17:21 ` Oleksii
2023-02-28 17:57 ` Julien Grall
2023-03-01 12:31 ` Oleksii
2023-03-01 13:58 ` Julien Grall
2023-03-01 15:16 ` Oleksii
2023-03-01 15:21 ` Julien Grall
2023-03-01 15:28 ` Oleksii
2023-03-01 15:58 ` Oleksii
2023-02-28 15:09 ` Oleksii
2023-02-28 17:48 ` Julien Grall [this message]
2023-03-01 8:58 ` Oleksii
2023-03-01 9:31 ` Julien Grall
2023-03-01 12:33 ` Oleksii
2023-02-24 11:31 ` [PATCH v3 4/4] xen/x86: switch x86 to use generic implemetation " Oleksii Kurochko
2023-02-27 14:46 ` Jan Beulich
2023-02-28 16:28 ` Oleksii
2023-02-28 16:36 ` Jan Beulich
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