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Thu, 26 Feb 2026 22:16:59 -0800 (PST) Received: from dw-tp ([203.81.243.177]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2adfb6d1913sm57837485ad.77.2026.02.26.22.16.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Feb 2026 22:16:58 -0800 (PST) From: "Ritesh Harjani (IBM)" To: linuxppc-dev@lists.ozlabs.org Cc: linux-mm@kvack.org, kvm@vger.kernel.org, Alex Williamson , Peter Xu , "Ritesh Harjani (IBM)" Subject: [RFC v1 2/2] powerpc/64s: Add support for huge pfnmaps Date: Fri, 27 Feb 2026 11:46:37 +0530 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: <0b8fce7a61561640634317a5e287cdb4794715fd.1772170860.git.ritesh.list@gmail.com> References: <0b8fce7a61561640634317a5e287cdb4794715fd.1772170860.git.ritesh.list@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: spew35rhkdm45fxe9mssejmpxaax9ztw X-Rspam-User: X-Rspamd-Queue-Id: D8310C000A X-Rspamd-Server: rspam04 X-HE-Tag: 1772173020-926715 X-HE-Meta: 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 7K65TBlp 4lfImSL4kGVDsVCHXHqfPU3Vv5SOpIiEMzrTKsQhiMPyTDulGDevageZnJdS25tR670uHVlm8++/1rFipsdYTucG1tYQYiVoQoFacDmMv5WuLd//55dRGCh8cWu1I/zUH07axtiQYQ7QmQQGORAtf3LvZuGGAlRtnpnsr 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. Signed-off-by: Ritesh Harjani (IBM) --- @linux-mm: Is there any official test which I could use to verify this functionality. For now I used basic ivshmem setup + vfio using Qemu and validated using some basic test to see that we are seeing these prints. [ 4351.435050] vfio_pci_mmap_huge_fault: 3 callbacks suppressed [ 4351.435234] vfio-pci 0001:00:00.0: vfio_pci_mmap_huge_fault(,order = 5) BAR 2 page offset 0x0: 0x100 [ 4351.457005] vfio-pci 0001:00:00.0: vfio_pci_mmap_huge_fault(,order = 5) BAR 2 page offset 0x40: 0x100 [ 4351.463684] vfio-pci 0001:00:00.0: vfio_pci_mmap_huge_fault(,order = 5) BAR 2 page offset 0x20: 0x100 arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/book3s/64/pgtable.h | 23 ++++++++++++++++++++ arch/powerpc/include/asm/pgtable.h | 12 ++++++++++ 3 files changed, 36 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..2d27cb1c2334 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -63,6 +63,18 @@ static inline pgprot_t pte_pgprot(pte_t pte) return __pgprot(pte_flags); } +#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)); +} + static inline pgprot_t pgprot_nx(pgprot_t prot) { return pte_pgprot(pte_exprotect(__pte(pgprot_val(prot)))); -- 2.53.0