From: Mike Rapoport <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>,
Andy Lutomirski <luto@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Borislav Petkov <bp@alien8.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Christoph Lameter <cl@linux.com>,
"David S. Miller" <davem@davemloft.net>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
David Rientjes <rientjes@google.com>,
"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Heiko Carstens <hca@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Len Brown <len.brown@intel.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Mike Rapoport <rppt@kernel.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Mackerras <paulus@samba.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Pavel Machek <pavel@ucw.cz>, Pekka Enberg <penberg@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Thomas Gleixner <tglx@linutronix.de>,
Vasily Gorbik <gor@linux.ibm.com>, Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
sparclinux@vger.kernel.org, x86@kernel.org
Subject: [PATCH 2/4] PM: hibernate: improve robustness of mapping pages in the direct map
Date: Sun, 25 Oct 2020 12:15:53 +0200 [thread overview]
Message-ID: <20201025101555.3057-3-rppt@kernel.org> (raw)
In-Reply-To: <20201025101555.3057-1-rppt@kernel.org>
From: Mike Rapoport <rppt@linux.ibm.com>
When DEBUG_PAGEALLOC or ARCH_HAS_SET_DIRECT_MAP is enabled a page may be
not present in the direct map and has to be explicitly mapped before it
could be copied.
On arm64 it is possible that a page would be removed from the direct map
using set_direct_map_invalid_noflush() but __kernel_map_pages() will refuse
to map this page back if DEBUG_PAGEALLOC is disabled.
Explicitly use set_direct_map_{default,invalid}_noflush() for
ARCH_HAS_SET_DIRECT_MAP case and debug_pagealloc_map_pages() for
DEBUG_PAGEALLOC case.
While on that, rename kernel_map_pages() to hibernate_map_page() and drop
numpages parameter.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
kernel/power/snapshot.c | 29 +++++++++++++++++++----------
1 file changed, 19 insertions(+), 10 deletions(-)
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index fa499466f645..ecb7b32ce77c 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -76,16 +76,25 @@ static inline void hibernate_restore_protect_page(void *page_address) {}
static inline void hibernate_restore_unprotect_page(void *page_address) {}
#endif /* CONFIG_STRICT_KERNEL_RWX && CONFIG_ARCH_HAS_SET_MEMORY */
-#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_ARCH_HAS_SET_DIRECT_MAP)
-static inline void
-kernel_map_pages(struct page *page, int numpages, int enable)
+static inline void hibernate_map_page(struct page *page, int enable)
{
- __kernel_map_pages(page, numpages, enable);
+ if (IS_ENABLED(CONFIG_ARCH_HAS_SET_DIRECT_MAP)) {
+ unsigned long addr = (unsigned long)page_address(page);
+ int ret;
+
+ if (enable)
+ ret = set_direct_map_default_noflush(page);
+ else
+ ret = set_direct_map_invalid_noflush(page);
+
+ if (WARN_ON(ret))
+ return;
+
+ flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+ } else {
+ debug_pagealloc_map_pages(page, 1, enable);
+ }
}
-#else
-static inline void
-kernel_map_pages(struct page *page, int numpages, int enable) {}
-#endif
static int swsusp_page_is_free(struct page *);
static void swsusp_set_page_forbidden(struct page *);
@@ -1366,9 +1375,9 @@ static void safe_copy_page(void *dst, struct page *s_page)
if (kernel_page_present(s_page)) {
do_copy_page(dst, page_address(s_page));
} else {
- kernel_map_pages(s_page, 1, 1);
+ hibernate_map_page(s_page, 1);
do_copy_page(dst, page_address(s_page));
- kernel_map_pages(s_page, 1, 0);
+ hibernate_map_page(s_page, 0);
}
}
--
2.28.0
next prev parent reply other threads:[~2020-10-25 10:16 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-25 10:15 [PATCH 0/4] arch, mm: improve robustness of direct map manipulation Mike Rapoport
2020-10-25 10:15 ` [PATCH 1/4] mm: introduce debug_pagealloc_map_pages() helper Mike Rapoport
2020-10-26 11:05 ` David Hildenbrand
2020-10-26 11:54 ` Mike Rapoport
2020-10-26 11:55 ` David Hildenbrand
2020-10-25 10:15 ` Mike Rapoport [this message]
2020-10-26 0:38 ` [PATCH 2/4] PM: hibernate: improve robustness of mapping pages in the direct map Edgecombe, Rick P
2020-10-26 9:15 ` Mike Rapoport
2020-10-26 18:57 ` Edgecombe, Rick P
2020-10-27 8:49 ` Mike Rapoport
2020-10-27 22:44 ` Edgecombe, Rick P
2020-10-28 9:41 ` Mike Rapoport
2020-10-27 1:10 ` Edgecombe, Rick P
2020-10-28 21:15 ` Edgecombe, Rick P
2020-10-29 7:54 ` Mike Rapoport
2020-10-29 23:19 ` Edgecombe, Rick P
2020-11-01 17:02 ` Mike Rapoport
2020-10-25 10:15 ` [PATCH 3/4] arch, mm: restore dependency of __kernel_map_pages() of DEBUG_PAGEALLOC Mike Rapoport
2020-10-25 10:15 ` [PATCH 4/4] arch, mm: make kernel_page_present() always available Mike Rapoport
2020-10-26 0:54 ` Edgecombe, Rick P
2020-10-26 9:31 ` Mike Rapoport
2020-10-26 1:13 ` [PATCH 0/4] arch, mm: improve robustness of direct map manipulation Edgecombe, Rick P
2020-10-26 9:05 ` Mike Rapoport
2020-10-26 18:05 ` Edgecombe, Rick P
2020-10-27 8:38 ` Mike Rapoport
2020-10-27 8:46 ` David Hildenbrand
2020-10-27 9:47 ` Mike Rapoport
2020-10-27 10:34 ` David Hildenbrand
2020-10-28 11:09 ` Mike Rapoport
2020-10-28 11:17 ` David Hildenbrand
2020-10-28 12:22 ` Mike Rapoport
2020-10-28 18:31 ` Edgecombe, Rick P
2020-10-28 11:20 ` Will Deacon
2020-10-28 11:30 ` Mike Rapoport
2020-10-28 21:03 ` Edgecombe, Rick P
2020-10-29 8:12 ` Mike Rapoport
2020-10-29 23:19 ` Edgecombe, Rick P
2020-10-29 8:15 ` David Hildenbrand
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