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powerpc/8xx: rework support for 8M pages using contiguous PTE entries

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In order to fit better with standard Linux page tables layout, add support
for 8M pages using contiguous PTE entries in a standard page table.  Page
tables will then be populated with 1024 similar entries and two PMD
entries will point to that page table.

The PMD entries also get a flag to tell it is addressing an 8M page, this
is required for the HW tablewalk assistance.

Link: https://lkml.kernel.org/r/8693d9a0408371043ca63bf9e4a9c140667af63e.1719928057.git.christophe.leroy@csgroup.eu
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christophe Leroy
2024-07-02 15:51:25 +02:00
committed by Andrew Morton
parent 7ea981070f
commit 0549e76663
12 changed files with 111 additions and 114 deletions
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3
arch/powerpc/include/asm/pgtable.h
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@@ -106,6 +106,9 @@ unsigned long vmalloc_to_phys(void *vmalloc_addr);
void pgtable_cache_add(unsigned int shift);
#ifdef CONFIG_PPC32
void __init *early_alloc_pgtable(unsigned long size);
#endif
pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)