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Mon, 09 Mar 2026 05:38:54 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: linuxppc-dev@lists.ozlabs.org Cc: Madhavan Srinivasan , Christophe Leroy , linux-mm@kvack.org, kvm@vger.kernel.org, Alex Williamson , Peter Xu , "Ritesh Harjani (IBM)" Subject: [PATCH v2 2/2] powerpc/64s: Add support for huge pfnmaps Date: Mon, 9 Mar 2026 18:08:38 +0530 Message-Id: <6fca726574236f556dd4e1e259692e82a4c29e85.1773058761.git.ritesh.list@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 46900140014 X-Stat-Signature: 9sdr3aj8ncxp8e3jf9y8www7hqgj7859 X-Rspam-User: X-HE-Tag: 1773059936-49264 X-HE-Meta: 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 llq1YOd4 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This uses _RPAGE_SW2 bit for the PMD and PUDs similar to PTEs. This also adds support for {pte,pmd,pud}_pgprot helpers needed for follow_pfnmap APIs. This allows us to extend the PFN mappings, e.g. PCI MMIO bars where it can grow as large as 8GB or even bigger, to map at PMD / PUD level. VFIO PCI core driver already supports fault handling at PMD / PUD level for more efficient BAR mappings. Reviewed-by: Christophe Leroy (CS GROUP) Signed-off-by: Ritesh Harjani (IBM) --- v1 -> v2: 1. Added CONFIG_PPC64 #ifdef blocks around p{u|m}d_pgprot() 2. Retained the RB from Christophe. arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/book3s/64/pgtable.h | 23 ++++++++++++++++++++ arch/powerpc/include/asm/pgtable.h | 14 ++++++++++++ 3 files changed, 38 insertions(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index ad7a2fe63a2a..cf9283757e5d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -172,6 +172,7 @@ config PPC select ARCH_STACKWALK select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx + select ARCH_SUPPORTS_HUGE_PFNMAP if PPC_BOOK3S_64 && TRANSPARENT_HUGEPAGE select ARCH_SUPPORTS_PAGE_TABLE_CHECK if !HUGETLB_PAGE select ARCH_SUPPORTS_SCHED_MC if SMP select ARCH_SUPPORTS_SCHED_SMT if PPC64 && SMP diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 1a91762b455d..639cbf34f752 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -1289,6 +1289,29 @@ static inline pud_t pud_mkhuge(pud_t pud) return pud; } +#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP +static inline bool pmd_special(pmd_t pmd) +{ + return pte_special(pmd_pte(pmd)); +} + +static inline pmd_t pmd_mkspecial(pmd_t pmd) +{ + return pte_pmd(pte_mkspecial(pmd_pte(pmd))); +} +#endif + +#ifdef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP +static inline bool pud_special(pud_t pud) +{ + return pte_special(pud_pte(pud)); +} + +static inline pud_t pud_mkspecial(pud_t pud) +{ + return pte_pud(pte_mkspecial(pud_pte(pud))); +} +#endif #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS extern int pmdp_set_access_flags(struct vm_area_struct *vma, diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index dcd3a88caaf6..97ccfa6e3dde 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -63,6 +63,20 @@ static inline pgprot_t pte_pgprot(pte_t pte) return __pgprot(pte_flags); } +#ifdef CONFIG_PPC64 +#define pmd_pgprot pmd_pgprot +static inline pgprot_t pmd_pgprot(pmd_t pmd) +{ + return pte_pgprot(pmd_pte(pmd)); +} + +#define pud_pgprot pud_pgprot +static inline pgprot_t pud_pgprot(pud_t pud) +{ + return pte_pgprot(pud_pte(pud)); +} +#endif /* CONFIG_PPC64 */ + static inline pgprot_t pgprot_nx(pgprot_t prot) { return pte_pgprot(pte_exprotect(__pte(pgprot_val(prot)))); -- 2.39.5