Re: [PATCH] x86/64/mm: Map all kernel memory into trampoline_pgd

Hi Mike,

On Tue, Sep 14, 2021 at 10:52:39AM +0300, Mike Rapoport wrote:

On Mon, Sep 13, 2021 at 11:52:36AM +0200, Joerg Roedel wrote:

...

• for (i = pgd_index(__PAGE_OFFSET); i < PTRS_PER_PGD; i++)

• trampoline_pgd[i] = init_top_pgt[i].pgd;
  

Don't we need to update the trampoline_pgd in sync_global_pgds() as well?

No, the trampoline_pgd is setup after preallocate_vmalloc_pages(), so everything that would need synchronization is already in the reference page-table.

Regards,

Joerg