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page_fault_handler(): map Linux ioremap addresses on demand (disabled)

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This commit is contained in:
Balazs Gerofi
2017-10-25 21:12:39 +09:00
parent 5bea237581
commit f6405081a6
1 changed files with 54 additions and 0 deletions
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54
kernel/mem.c
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@@ -1168,6 +1168,60 @@ static void page_fault_handler(void *fault_addr, uint64_t reason, void *regs)
dkprintf("%s: addr: %p, reason: %lx, regs: %p\n",
__FUNCTION__, fault_addr, reason, regs);
#if 0
/* Linux ioremap address? */
if ((unsigned long)fault_addr >= 0xFFFFC90000000000 &&
(unsigned long)fault_addr < 0xFFFFFFFF80000000) {
pte_t *lptep;
pte_t *ptep;
enum ihk_mc_pt_attribute attr =
PTATTR_UNCACHABLE | PTATTR_WRITABLE;
unsigned long phys;
void *virt = fault_addr;
struct process_vm *vm = cpu_local_var(current)->vm;
if (!vm) {
goto regular_handler;
}
/* Is this a valid address in Linux? */
lptep = ihk_mc_pt_lookup_pte(ihk_mc_get_linux_kernel_pgt(),
virt, 0, 0, 0, 0);
if (!lptep || !pte_is_present(lptep)) {
kprintf("%s: ERROR: no mapping in Linux for: 0x%lx?\n",
__FUNCTION__, virt);
goto regular_handler;
}
phys = pte_get_phys(lptep);
if (ihk_mc_pt_set_page(vm->address_space->page_table,
virt, phys, attr) < 0) {
/* Not necessarily an error.. */
kprintf("%s: WARNING: mapping: 0x%lx -> 0x%lx\n",
__FUNCTION__, virt, phys);
}
ptep = ihk_mc_pt_lookup_pte(vm->address_space->page_table,
virt, 0, 0, 0, 0);
if (!ptep) {
kprintf("%s: ERROR: no PTE in McKernel for: 0x%lx?\n",
__FUNCTION__, virt);
goto regular_handler;
}
*ptep = *lptep;
kprintf("%s: Linux ioremap address 0x%lx -> 0x%lx "
"mapped on demand\n",
__FUNCTION__, virt, phys);
flush_tlb_single(virt);
error = 0;
goto out;
}
regular_handler:
#endif
preempt_disable();
cpu_enable_interrupt();