Re: [PATCH v3 0/7] Unflattening and relocation of host device tree

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

On 12/17/24 5:36 PM, Jan Beulich wrote:

> On 17.12.2024 17:32, Oleksii Kurochko wrote:
> > The current patch series introduces the relocation of the host device tree file
> > to free up low memory and also it is expected that discard_initial_modules()
> > will be called sooner or later, it will discard the FDT boot module,
> > and remove_early_mappings() will destroy the early mappings.
> >
> > In addition to relocation, unflattening is introduced to create the tree of
> > struct device_node for the host device tree.
> >
> > To implement this, several things have been introduced:
> >  - destroy_xen_mappings() function, which removes page mappings from Xen's
> >    page tables. This is necessary for clear_fixmap().
> >  - {set,clear}_fixmap() functions to manage mappings in the fixmap region,
> >    which are expected to be used in copy_from_paddr() to copy the FDT to Xen's
> >    heap.
> >  - Introduce new config CONFIG_QEMU which is going to be used to cover changes
> >    connected to QEMU virtual board. It will be used during introduction of stubs
> >    for clean_and_invalidate_dcache_va_range() and clean_dcache_va_range(),
> >    which are expected to be used in copy_from_paddr() and flush_page_to_ram(),
> >    which in turn are expected to be used during the call to xvmalloc_array() in
> >    relocate_fdt().
> >    In case of QEMU cached related functions are implemented as returning 0 as
> >    QEMU doesn't model cache ( and so CMO extensions ). For others cases, it is
> >    introduced as -ENOSUPP as h/w could support CMO extension ( or hardware
> >    specific insertions ) and it will need to update implementation of the
> >    mentioned functions.
> >  - The introduction of copy_from_paddr() to copy the FDT to an address
> >    allocated in Xen's heap.
> >
> > ---
> > Changes in v3:
> >  - Add some Acks for the patches. All the patches are Acked except:
> >      [PATCH v3 1/7] xen/riscv: update layout table in config.h
> >      [PATCH v3 5/7] xen/riscv: implement data and instruction cache operations
> >  - Other changes please look at the specific patch.
> > ---
> > Changes in v2:
> >  - Update the cover letter.
> >  - Introduce new patch with aligning of upper bounds in the layout table in
> >    config.h with the definitions below which are inclusive.
> >  - Other changes please look at the specific patch.
> > ---
> >
> > Oleksii Kurochko (7):
> >   xen/riscv: update layout table in config.h
> >   xen/riscv: add destroy_xen_mappings() to remove mappings in Xen page
> >     tables
> >   xen/riscv: reorder includes in asm/page.h alphabetically
> >   xen/riscv: add {set,clear}_fixmap() functions for managing fixmap
> >     entries
> >       
> Please can you avoid re-posting patches that were already committed (the
> latter three)?
>     
Sure, I confused something when fetch upstream/staging so missed that some patches
were merged.
Sorry for inconvenience.

~ Oleksii