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[2003:cb:c70f:6900:6c56:80f8:c14:6d2a]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3a073c8ca72sm1597057f8f.4.2025.04.25.01.17.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Apr 2025 01:17:25 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org, David Hildenbrand , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Andrew Morton , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , Pedro Falcato , Peter Xu Subject: [PATCH v1 03/11] x86/mm/pat: introduce pfnmap_track() and pfnmap_untrack() Date: Fri, 25 Apr 2025 10:17:07 +0200 Message-ID: <20250425081715.1341199-4-david@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250425081715.1341199-1-david@redhat.com> References: <20250425081715.1341199-1-david@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: hKbWW0UrcFDBCFv2WPGn6hwraEEHWkPLZi0Oc3sljxA_1745569046 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspam-User: X-Rspamd-Queue-Id: 848FEA0006 X-Rspamd-Server: rspam04 X-Stat-Signature: fjfax5j7bop65b8whueaje63oznw93ay X-HE-Tag: 1745569049-980925 X-HE-Meta: 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 +Ydp8emQ 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Let's provide variants of track_pfn_remap() and untrack_pfn() that won't mess with VMAs, to replace the existing interface step-by-step. Add some documentation. Signed-off-by: David Hildenbrand --- arch/x86/mm/pat/memtype.c | 14 ++++++++++++++ include/linux/pgtable.h | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c index 193e33251b18f..c011d8dd8f441 100644 --- a/arch/x86/mm/pat/memtype.c +++ b/arch/x86/mm/pat/memtype.c @@ -1068,6 +1068,20 @@ int pfnmap_sanitize_pgprot(unsigned long pfn, unsigned long size, pgprot_t *prot return 0; } +int pfnmap_track(unsigned long pfn, unsigned long size, pgprot_t *prot) +{ + const resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT; + + return reserve_pfn_range(paddr, size, prot, 0); +} + +void pfnmap_untrack(unsigned long pfn, unsigned long size) +{ + const resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT; + + free_pfn_range(paddr, size); +} + /* * untrack_pfn is called while unmapping a pfnmap for a region. * untrack can be called for a specific region indicated by pfn and size or diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 91aadfe2515a5..898a3ab195578 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1506,6 +1506,16 @@ static inline int pfnmap_sanitize_pgprot(unsigned long pfn, unsigned long size, return 0; } +static inline int pfnmap_track(unsigned long pfn, unsigned long size, + pgprot_t *prot) +{ + return 0; +} + +static inline void pfnmap_untrack(unsigned long pfn, unsigned long size) +{ +} + /* * track_pfn_copy is called when a VM_PFNMAP VMA is about to get the page * tables copied during copy_page_range(). Will store the pfn to be @@ -1570,6 +1580,29 @@ extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, */ int pfnmap_sanitize_pgprot(unsigned long pfn, unsigned long size, pgprot_t *prot); + +/** + * pfnmap_track - track a pfn range + * @pfn: the start of the pfn range + * @size: the size of the pfn range + * @prot: the pgprot to track + * + * Tracking a pfnmap range involves conditionally reserving a pfn range and + * sanitizing the pgprot -- see pfnmap_sanitize_pgprot(). + * + * Returns 0 on success and -EINVAL on error. + */ +int pfnmap_track(unsigned long pfn, unsigned long size, pgprot_t *prot); + +/** + * pfnmap_untrack - untrack a pfn range + * @pfn: the start of the pfn range + * @size: the size of the pfn range + * + * Untrack a pfn range previously tracked through pfnmap_track(), for example, + * un-doing any reservation. + */ +void pfnmap_untrack(unsigned long pfn, unsigned long size); extern int track_pfn_copy(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma, unsigned long *pfn); extern void untrack_pfn_copy(struct vm_area_struct *dst_vma, -- 2.49.0