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,
mark.rutland@arm.com
Subject: [PATCH v4 02/17] arm64: hibernate: pass the allocated pgdp to ttbr0
Date: Mon, 9 Sep 2019 14:12:06 -0400 [thread overview]
Message-ID: <20190909181221.309510-3-pasha.tatashin@soleen.com> (raw)
In-Reply-To: <20190909181221.309510-1-pasha.tatashin@soleen.com>
ttbr0 should be set to the beginning of pgdp, however, currently
in create_safe_exec_page it is set to pgdp after pgd_offset_raw(),
which works by accident.
Fixes: 0194e760f7d2 ("arm64: hibernate: avoid potential TLB conflict")
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
---
arch/arm64/kernel/hibernate.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 9341fcc6e809..025221564252 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -201,6 +201,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
gfp_t mask)
{
int rc = 0;
+ pgd_t *trans_pgd;
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
@@ -215,7 +216,8 @@ static int create_safe_exec_page(void *src_start, size_t length,
memcpy((void *)dst, src_start, length);
__flush_icache_range(dst, dst + length);
- pgdp = pgd_offset_raw(allocator(mask), dst_addr);
+ trans_pgd = allocator(mask);
+ pgdp = pgd_offset_raw(trans_pgd, dst_addr);
if (pgd_none(READ_ONCE(*pgdp))) {
pudp = allocator(mask);
if (!pudp) {
@@ -262,7 +264,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
*/
cpu_set_reserved_ttbr0();
local_flush_tlb_all();
- write_sysreg(phys_to_ttbr(virt_to_phys(pgdp)), ttbr0_el1);
+ write_sysreg(phys_to_ttbr(virt_to_phys(trans_pgd)), ttbr0_el1);
isb();
*phys_dst_addr = virt_to_phys((void *)dst);
--
2.23.0
next prev parent reply other threads:[~2019-09-09 18:13 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 18:12 [PATCH v4 00/17] arm64: MMU enabled kexec relocation Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 01/17] kexec: quiet down kexec reboot Pavel Tatashin
2019-09-09 18:12 ` Pavel Tatashin [this message]
2019-09-09 18:12 ` [PATCH v4 03/17] arm64: hibernate: check pgd table allocation Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 04/17] arm64: hibernate: use get_safe_page directly Pavel Tatashin
2019-09-10 8:03 ` Matthias Brugger
2019-09-10 9:10 ` Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 05/17] arm64: hibernate: remove gotos in create_safe_exec_page Pavel Tatashin
2019-09-10 8:21 ` Matthias Brugger
2019-09-10 9:12 ` Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 06/17] arm64: hibernate: rename dst to page " Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 07/17] arm64: hibernate: add PUD_SECT_RDONLY Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 08/17] arm64: hibernate: add trans_pgd public functions Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 09/17] arm64: hibernate: move page handling function to new trans_pgd.c Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 10/17] arm64: trans_pgd: make trans_pgd_map_page generic Pavel Tatashin
2019-09-10 8:29 ` Matthias Brugger
2019-09-10 9:20 ` Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 11/17] arm64: trans_pgd: pass allocator trans_pgd_create_copy Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 12/17] arm64: trans_pgd: pass NULL instead of init_mm to *_populate functions Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 13/17] kexec: add machine_kexec_post_load() Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 14/17] arm64: kexec: move relocation function setup and clean up Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 15/17] arm64: kexec: add expandable argument to relocation function Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 16/17] arm64: kexec: configure trans_pgd page table for kexec Pavel Tatashin
2019-09-09 18:12 ` [PATCH v4 17/17] arm64: kexec: enable MMU during kexec relocation Pavel Tatashin
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