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Re: [XEN PATCH v1 1/4] arch/riscv: initial RISC-V support to build/run minimal Xen
- To: Alistair Francis <alistair23@xxxxxxxxx>, Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Wed, 28 Dec 2022 19:01:56 +0000
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- Cc: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Gianluca Guida <gianluca@xxxxxxxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [XEN PATCH v1 1/4] arch/riscv: initial RISC-V support to build/run minimal Xen
On 28/12/2022 4:51 am, Alistair Francis wrote:
> On Mon, Dec 26, 2022 at 9:14 PM Oleksii <oleksii.kurochko@xxxxxxxxx> wrote:
>> On Fri, 2022-12-23 at 13:50 +0000, Julien Grall wrote:
>>> On 23/12/2022 11:16, Oleksii Kurochko wrote:
>>>> + . = ALIGN(PAGE_SIZE);
>>>> + .bss : {
>>>> + __bss_start = .;
>>>> + *(.bss .bss.*)
>>>> + . = ALIGN(POINTER_ALIGN);
>>>> + __bss_end = .;
>>> Same as .data, I would recommend to properly populate it.
>> Do you mean to add .bss.stack_aligned, .bss.page_aligned, .bss.percpu*?
>> One of the reasons they were skipped is they aren't used now and one
>> more reason if to believe xen.lds.S file from ARM
>> .bss.percpu.read_mostly should be aligned by SMP_CACHE_BYTES which
>> requires dummy <asm/cache.h> (or not ?) which will increase the patch
>> with unneeded stuff for now.
> I think we should aim to get the linker file sorted right from the
> start. Otherwise someone is going to hit a nasty bug at some point in
> the future.
What needs to happen is actually for Xen to start using a common linker
script, rather than a per-arch linker script.
The vast majority of the linker script is not architecture specific to
begin with, and the rest is easy to parametrise.
But in the short term, it's more important to get something working and
properly into CI, rather than to block this change waiting for feature
parity with a whole load of features not currently used.
~Andrew
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