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Subject[PATCH v4 02/17] arm64: hibernate: pass the allocated pgdp to ttbr0
Date
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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