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xpmem: fault stack area of remote process if VM range doesn't yet exist

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Change-Id: I2bbb745cc9b79ab4f9ea81b242f35f1b88ad531e
This commit is contained in:
Balazs Gerofi
2021-02-14 20:42:18 +09:00
committed by Masamichi Takagi
parent a82d161be8
commit c7145c4b38
1 changed files with 15 additions and 0 deletions
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15
kernel/xpmem.c
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@ -2056,6 +2056,7 @@ static int xpmem_pin_page(
XPMEM_DEBUG("call: tgid=%d, vaddr=0x%lx", tg->tgid, vaddr);
retry:
ihk_rwspinlock_read_lock_noirq(&src_vm->memory_range_lock);
range = lookup_process_memory_range(src_vm, vaddr, vaddr + 1);
@ -2063,6 +2064,20 @@ static int xpmem_pin_page(
ihk_rwspinlock_read_unlock_noirq(&src_vm->memory_range_lock);
if (!range || range->start > vaddr) {
/*
* Grow the stack if address falls into stack region
* so that we can lookup range successfully.
*/
if (src_vm->region.stack_start <= vaddr &&
src_vm->region.stack_end > vaddr) {
if (page_fault_process_vm(src_vm, (void *)vaddr,
PF_POPULATE | PF_WRITE | PF_USER) < 0) {
return -ENOENT;
}
goto retry;
}
return -ENOENT;
}