[PATCH v4 02/17] arm64: hibernate: pass the allocated pgdp to ttbr0
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From: Pavel Tatashin <pasha.tatashin@soleen.com>
Date: 2019-09-09 18:13:34
Also in:
kexec, linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Revision v4 of 18 in this series.
Revisions (18)
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- v17 [diff vs current]
- v18 [diff vs current]
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
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