From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org,
ebiederm@xmission.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, corbet@lwn.net,
catalin.marinas@arm.com, will@kernel.org,
linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com,
james.morse@arm.com, vladimir.murzin@arm.com,
matthias.bgg@gmail.com, bhsharma@redhat.com, linux-mm@kvack.org
Subject: [PATCH v2 06/14] arm64, trans_table: add trans_table_create_empty
Date: Fri, 16 Aug 2019 22:46:21 -0400 [thread overview]
Message-ID: <20190817024629.26611-7-pasha.tatashin@soleen.com> (raw)
In-Reply-To: <20190817024629.26611-1-pasha.tatashin@soleen.com>
This functions returns a zeroed trans_table using the allocator that is
specified in the info argument.
trans_tables should be created by using this function.
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
---
arch/arm64/include/asm/trans_table.h | 4 ++++
arch/arm64/kernel/hibernate.c | 6 +++---
arch/arm64/mm/trans_table.c | 12 ++++++++++++
3 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/include/asm/trans_table.h b/arch/arm64/include/asm/trans_table.h
index 1a57af09ded5..02d3a0333dc9 100644
--- a/arch/arm64/include/asm/trans_table.h
+++ b/arch/arm64/include/asm/trans_table.h
@@ -40,6 +40,10 @@ struct trans_table_info {
unsigned long trans_flags;
};
+/* Create and empty trans table. */
+int trans_table_create_empty(struct trans_table_info *info,
+ pgd_t **trans_table);
+
int trans_table_create_copy(pgd_t **dst_pgdp, unsigned long start,
unsigned long end);
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 524b68ec3233..3a7b362e5a58 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -216,9 +216,9 @@ static int create_safe_exec_page(void *src_start, size_t length,
memcpy(page, src_start, length);
__flush_icache_range((unsigned long)page, (unsigned long)page + length);
- trans_table = (void *)get_safe_page(GFP_ATOMIC);
- if (!trans_table)
- return -ENOMEM;
+ rc = trans_table_create_empty(&trans_info, &trans_table);
+ if (rc)
+ return rc;
rc = trans_table_map_page(&trans_info, trans_table, page, dst_addr,
PAGE_KERNEL_EXEC);
diff --git a/arch/arm64/mm/trans_table.c b/arch/arm64/mm/trans_table.c
index 12f4b3cab6d6..6deb35f83118 100644
--- a/arch/arm64/mm/trans_table.c
+++ b/arch/arm64/mm/trans_table.c
@@ -164,6 +164,18 @@ static int copy_page_tables(pgd_t *dst_pgdp, unsigned long start,
return 0;
}
+int trans_table_create_empty(struct trans_table_info *info, pgd_t **trans_table)
+{
+ pgd_t *dst_pgdp = trans_alloc(info);
+
+ if (!dst_pgdp)
+ return -ENOMEM;
+
+ *trans_table = dst_pgdp;
+
+ return 0;
+}
+
int trans_table_create_copy(pgd_t **dst_pgdp, unsigned long start,
unsigned long end)
{
--
2.22.1
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next prev parent reply other threads:[~2019-08-17 2:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-17 2:46 [PATCH v2 00/14] arm64: MMU enabled kexec relocation Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 01/14] kexec: quiet down kexec reboot Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 02/14] arm64, hibernate: create_safe_exec_page cleanup Pavel Tatashin
2019-08-19 15:50 ` Mark Rutland
2019-08-19 16:25 ` Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 03/14] arm64, hibernate: add trans_table public functions Pavel Tatashin
2019-08-19 15:58 ` Mark Rutland
2019-08-19 16:33 ` Pavel Tatashin
2019-08-20 11:30 ` Mark Rutland
2019-08-20 11:41 ` Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 04/14] arm64, hibernate: move page handling function to new trans_table.c Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 05/14] arm64, trans_table: make trans_table_map_page generic Pavel Tatashin
2019-08-17 2:46 ` Pavel Tatashin [this message]
2019-08-17 2:46 ` [PATCH v2 07/14] arm64, trans_table: adjust trans_table_create_copy interface Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 08/14] arm64, trans_table: add PUD_SECT_RDONLY Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 09/14] arm64, trans_table: complete generalization of trans_tables Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 10/14] kexec: add machine_kexec_post_load() Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 11/14] arm64, kexec: move relocation function setup and clean up Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 12/14] arm64, kexec: add expandable argument to relocation function Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 13/14] arm64, kexec: configure transitional page table for kexec Pavel Tatashin
2019-08-17 2:46 ` [PATCH v2 14/14] arm64, kexec: enable MMU during kexec relocation Pavel Tatashin
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