From: Anthony Yznaga <anthony.yznaga@oracle.com> To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, rppt@kernel.org, akpm@linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, graf@amazon.com, jason.zeng@intel.com, lei.l.li@intel.com, steven.sistare@oracle.com, fam.zheng@bytedance.com, mgalaxy@akamai.com, kexec@lists.infradead.org Subject: [RFC v3 16/21] PKRAM: provide a way to check if a memory range has preserved pages Date: Wed, 26 Apr 2023 17:08:52 -0700 [thread overview] Message-ID: <1682554137-13938-17-git-send-email-anthony.yznaga@oracle.com> (raw) In-Reply-To: <1682554137-13938-1-git-send-email-anthony.yznaga@oracle.com> When a kernel is loaded for kexec the address ranges where the kexec segments will be copied to may conflict with pages already set to be preserved. Provide a way to determine if preserved pages exist in a specified range. Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com> --- include/linux/pkram.h | 2 ++ mm/pkram.c | 20 ++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/include/linux/pkram.h b/include/linux/pkram.h index 29109e875604..bec9ae75e802 100644 --- a/include/linux/pkram.h +++ b/include/linux/pkram.h @@ -104,11 +104,13 @@ int pkram_prepare_save(struct pkram_stream *ps, const char *name, void pkram_reserve(void); void pkram_cleanup(void); void pkram_ban_region(unsigned long start, unsigned long end); +int pkram_has_preserved_pages(unsigned long start, unsigned long end); #else #define pkram_reserved_pages 0UL static inline void pkram_reserve(void) { } static inline void pkram_cleanup(void) { } static inline void pkram_ban_region(unsigned long start, unsigned long end) { } +static inline int pkram_has_preserved_pages(unsigned long start, unsigned long end) { return 0; } #endif #endif /* _LINUX_PKRAM_H */ diff --git a/mm/pkram.c b/mm/pkram.c index cef75bd8ba99..474fb6fc8355 100644 --- a/mm/pkram.c +++ b/mm/pkram.c @@ -1690,3 +1690,23 @@ void __init pkram_cleanup(void) pkram_reserved_pages--; } } + +static int has_preserved_pages_cb(unsigned long base, unsigned long size, void *private) +{ + int *has_preserved = (int *)private; + + *has_preserved = 1; + return 1; +} + +/* + * Check whether the memory range [start, end) contains preserved pages. + */ +int pkram_has_preserved_pages(unsigned long start, unsigned long end) +{ + int has_preserved = 0; + + pkram_find_preserved(start, end, &has_preserved, has_preserved_pages_cb); + + return has_preserved; +} -- 1.9.4
WARNING: multiple messages have this Message-ID (diff)
From: Anthony Yznaga <anthony.yznaga@oracle.com> To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, rppt@kernel.org, akpm@linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, graf@amazon.com, jason.zeng@intel.com, lei.l.li@intel.com, steven.sistare@oracle.com, fam.zheng@bytedance.com, mgalaxy@akamai.com, kexec@lists.infradead.org Subject: [RFC v3 16/21] PKRAM: provide a way to check if a memory range has preserved pages Date: Wed, 26 Apr 2023 17:08:52 -0700 [thread overview] Message-ID: <1682554137-13938-17-git-send-email-anthony.yznaga@oracle.com> (raw) In-Reply-To: <1682554137-13938-1-git-send-email-anthony.yznaga@oracle.com> When a kernel is loaded for kexec the address ranges where the kexec segments will be copied to may conflict with pages already set to be preserved. Provide a way to determine if preserved pages exist in a specified range. Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com> --- include/linux/pkram.h | 2 ++ mm/pkram.c | 20 ++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/include/linux/pkram.h b/include/linux/pkram.h index 29109e875604..bec9ae75e802 100644 --- a/include/linux/pkram.h +++ b/include/linux/pkram.h @@ -104,11 +104,13 @@ int pkram_prepare_save(struct pkram_stream *ps, const char *name, void pkram_reserve(void); void pkram_cleanup(void); void pkram_ban_region(unsigned long start, unsigned long end); +int pkram_has_preserved_pages(unsigned long start, unsigned long end); #else #define pkram_reserved_pages 0UL static inline void pkram_reserve(void) { } static inline void pkram_cleanup(void) { } static inline void pkram_ban_region(unsigned long start, unsigned long end) { } +static inline int pkram_has_preserved_pages(unsigned long start, unsigned long end) { return 0; } #endif #endif /* _LINUX_PKRAM_H */ diff --git a/mm/pkram.c b/mm/pkram.c index cef75bd8ba99..474fb6fc8355 100644 --- a/mm/pkram.c +++ b/mm/pkram.c @@ -1690,3 +1690,23 @@ void __init pkram_cleanup(void) pkram_reserved_pages--; } } + +static int has_preserved_pages_cb(unsigned long base, unsigned long size, void *private) +{ + int *has_preserved = (int *)private; + + *has_preserved = 1; + return 1; +} + +/* + * Check whether the memory range [start, end) contains preserved pages. + */ +int pkram_has_preserved_pages(unsigned long start, unsigned long end) +{ + int has_preserved = 0; + + pkram_find_preserved(start, end, &has_preserved, has_preserved_pages_cb); + + return has_preserved; +} -- 1.9.4 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2023-04-27 0:10 UTC|newest] Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-04-27 0:08 [RFC v3 00/21] Preserved-over-Kexec RAM Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 01/21] mm: add PKRAM API stubs and Kconfig Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 02/21] mm: PKRAM: implement node load and save functions Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 03/21] mm: PKRAM: implement object " Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 04/21] mm: PKRAM: implement folio stream operations Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 05/21] mm: PKRAM: implement byte " Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 06/21] mm: PKRAM: link nodes by pfn before reboot Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 07/21] mm: PKRAM: introduce super block Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-06-05 2:40 ` Coiby Xu 2023-06-05 2:40 ` Coiby Xu 2023-06-06 2:01 ` Anthony Yznaga 2023-06-06 2:01 ` Anthony Yznaga 2023-06-06 2:55 ` Coiby Xu 2023-06-06 2:55 ` Coiby Xu 2023-06-06 3:12 ` Anthony Yznaga 2023-06-06 3:12 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 08/21] PKRAM: track preserved pages in a physical mapping pagetable Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 09/21] PKRAM: pass a list of preserved ranges to the next kernel Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 10/21] PKRAM: prepare for adding preserved ranges to memblock reserved Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 11/21] mm: PKRAM: reserve preserved memory at boot Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 12/21] PKRAM: free the preserved ranges list Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 13/21] PKRAM: prevent inadvertent use of a stale superblock Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 14/21] PKRAM: provide a way to ban pages from use by PKRAM Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 15/21] kexec: PKRAM: prevent kexec clobbering preserved pages in some cases Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga [this message] 2023-04-27 0:08 ` [RFC v3 16/21] PKRAM: provide a way to check if a memory range has preserved pages Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 17/21] kexec: PKRAM: avoid clobbering already " Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 18/21] mm: PKRAM: allow preserved memory to be freed from userspace Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 19/21] PKRAM: disable feature when running the kdump kernel Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 20/21] x86/KASLR: PKRAM: support physical kaslr Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 0:08 ` [RFC v3 21/21] x86/boot/compressed/64: use 1GB pages for mappings Anthony Yznaga 2023-04-27 0:08 ` Anthony Yznaga 2023-04-27 18:40 ` H. Peter Anvin 2023-04-27 18:40 ` H. Peter Anvin 2023-04-27 22:38 ` Anthony Yznaga 2023-04-27 22:38 ` Anthony Yznaga 2023-05-26 13:57 ` [RFC v3 00/21] Preserved-over-Kexec RAM Gowans, James 2023-05-26 13:57 ` Gowans, James 2023-05-31 23:14 ` Anthony Yznaga 2023-05-31 23:14 ` Anthony Yznaga 2023-06-01 2:15 ` Baoquan He 2023-06-01 2:15 ` Baoquan He 2023-06-01 23:58 ` Anthony Yznaga 2023-06-01 23:58 ` Anthony Yznaga
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=1682554137-13938-17-git-send-email-anthony.yznaga@oracle.com \ --to=anthony.yznaga@oracle.com \ --cc=akpm@linux-foundation.org \ --cc=bp@alien8.de \ --cc=dave.hansen@linux.intel.com \ --cc=ebiederm@xmission.com \ --cc=fam.zheng@bytedance.com \ --cc=graf@amazon.com \ --cc=hpa@zytor.com \ --cc=jason.zeng@intel.com \ --cc=keescook@chromium.org \ --cc=kexec@lists.infradead.org \ --cc=lei.l.li@intel.com \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-mm@kvack.org \ --cc=luto@kernel.org \ --cc=mgalaxy@akamai.com \ --cc=mingo@redhat.com \ --cc=peterz@infradead.org \ --cc=rppt@kernel.org \ --cc=steven.sistare@oracle.com \ --cc=tglx@linutronix.de \ --cc=x86@kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.