Re: [Minios-devel] [UNIKRAFT PATCHv5 17/46] plat/kvm: Add linker script for Arm64

["Wei Chen (Arm Technology China)" <Wei.Chen@xxxxxxx>]

Hi Julien,

> -----Original Message-----
> From: Julien Grall <julien.grall@xxxxxxx>
> Sent: 2018年9月10日 18:16
> To: Wei Chen (Arm Technology China) <Wei.Chen@xxxxxxx>; minios-
> devel@xxxxxxxxxxxxxxxxxxxx; simon.kuenzer@xxxxxxxxx
> Cc: Kaly Xin (Arm Technology China) <Kaly.Xin@xxxxxxx>; nd <nd@xxxxxxx>
> Subject: Re: [Minios-devel] [UNIKRAFT PATCHv5 17/46] plat/kvm: Add linker
> script for Arm64
> 
> Hi Wei,
> 
> On 10/09/18 09:31, Wei Chen (Arm Technology China) wrote:
> >> -----Original Message-----
> >> From: Julien Grall <julien.grall@xxxxxxx>
> >> Sent: 2018年9月7日 22:50
> >> To: Wei Chen (Arm Technology China) <Wei.Chen@xxxxxxx>; minios-
> >> devel@xxxxxxxxxxxxxxxxxxxx; simon.kuenzer@xxxxxxxxx
> >> Cc: Kaly Xin (Arm Technology China) <Kaly.Xin@xxxxxxx>; nd <nd@xxxxxxx>
> >> Subject: Re: [Minios-devel] [UNIKRAFT PATCHv5 17/46] plat/kvm: Add linker
> >> script for Arm64
> >>
> >> Hi,
> >>
> >> On 08/10/2018 08:08 AM, Wei Chen wrote:
> >>> + /* Read-write data that is not initialized explicitly in code */
> >>> + .bss :
> >>> + {
> >>> +         *(.bss)
> >>> +         *(.bss.*)
> >>> +         *(COMMON)
> >>> +         . = ALIGN(__PAGE_SIZE);
> >>
> >> If you define the stack and page-table here. You can then free once boot
> >> is done.
> >
> > I had thought a similar method before, but I am afraid to increase the
> > image size, so I didn't use this method. Maybe I was considering too much
> > for it?
> 
> IHMO trying to reduce the image size in early stage of the arm64 support
> is very aggressive. This should be looked once you are done with the
> core support.
> 
> But I am not entirely sure to understand the concern regarding the image
> size. As this is part of BSS, the actual binary will not be bigger in
> the disk.
> 
> In the guest memory, you will indeed use more memory. You can introduce
> a new variable to tell you where the "boot memory". So you can discard
> it easily once you are done with it.
> 

Ok, I will try it : )

> This is not a proper "init section" but a way to avoid rely on free
> space after the image in memory.
> 
> Cheers,
> 
> --
> Julien Grall
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