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support msync() system call. refs #382

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Msync(2) of this version writes only the pages which the calling process
modified. Modifications of the other processes are not written.
This commit is contained in:
NAKAMURA Gou
2014-07-09 14:19:26 +09:00
parent 6485578a7f
commit 16af976a71
8 changed files with 356 additions and 0 deletions
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148
kernel/process.c
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@@ -1210,6 +1210,154 @@ out:
return error;
}
struct sync_args {
struct memobj *memobj;
};
static int sync_one_page(void *arg0, page_table_t pt, pte_t *ptep,
void *pgaddr, size_t pgsize)
{
struct sync_args *args = arg0;
int error;
uintptr_t phys;
dkprintf("sync_one_page(%p,%p,%p %#lx,%p,%#lx)\n",
arg0, pt, ptep, *ptep, pgaddr, pgsize);
if (pte_is_null(ptep) || pte_is_fileoff(ptep, pgsize)
|| !pte_is_dirty(ptep, pgsize)) {
error = 0;
goto out;
}
pte_clear_dirty(ptep, pgsize);
flush_tlb_single((uintptr_t)pgaddr); /* XXX: TLB flush */
phys = pte_get_phys(ptep);
error = memobj_flush_page(args->memobj, phys, pgsize);
if (error) {
ekprintf("sync_one_page(%p,%p,%p %#lx,%p,%#lx):"
"flush failed. %d\n",
arg0, pt, ptep, *ptep, pgaddr, pgsize, error);
pte_set_dirty(ptep, pgsize);
goto out;
}
error = 0;
out:
dkprintf("sync_one_page(%p,%p,%p %#lx,%p,%#lx):%d\n",
arg0, pt, ptep, *ptep, pgaddr, pgsize, error);
return error;
}
int sync_process_memory_range(struct process_vm *vm, struct vm_range *range,
uintptr_t start, uintptr_t end)
{
int error;
struct sync_args args;
dkprintf("sync_process_memory_range(%p,%p,%#lx,%#lx)\n",
vm, range, start, end);
args.memobj = range->memobj;
ihk_mc_spinlock_lock_noirq(&vm->page_table_lock);
memobj_lock(range->memobj);
error = visit_pte_range(vm->page_table, (void *)start, (void *)end,
VPTEF_SKIP_NULL, &sync_one_page, &args);
memobj_unlock(range->memobj);
ihk_mc_spinlock_unlock_noirq(&vm->page_table_lock);
if (error) {
ekprintf("sync_process_memory_range(%p,%p,%#lx,%#lx):"
"visit failed%d\n",
vm, range, start, end, error);
goto out;
}
out:
dkprintf("sync_process_memory_range(%p,%p,%#lx,%#lx):%d\n",
vm, range, start, end, error);
return error;
}
struct invalidate_args {
struct vm_range *range;
};
static int invalidate_one_page(void *arg0, page_table_t pt, pte_t *ptep,
void *pgaddr, size_t pgsize)
{
struct invalidate_args *args = arg0;
struct vm_range *range = args->range;
int error;
uintptr_t phys;
struct page *page;
off_t linear_off;
pte_t apte;
dkprintf("invalidate_one_page(%p,%p,%p %#lx,%p,%#lx)\n",
arg0, pt, ptep, *ptep, pgaddr, pgsize);
if (pte_is_null(ptep) || pte_is_fileoff(ptep, pgsize)) {
error = 0;
goto out;
}
phys = pte_get_phys(ptep);
page = phys_to_page(phys);
linear_off = range->objoff + ((uintptr_t)pgaddr - range->start);
if (page && (page->offset == linear_off)) {
pte_make_null(&apte, pgsize);
}
else {
pte_make_fileoff(page->offset, 0, pgsize, &apte);
}
pte_xchg(ptep, &apte);
flush_tlb_single((uintptr_t)pgaddr); /* XXX: TLB flush */
if (page && page_unmap(page)) {
panic("invalidate_one_page");
}
error = memobj_invalidate_page(range->memobj, phys, pgsize);
if (error) {
ekprintf("invalidate_one_page(%p,%p,%p %#lx,%p,%#lx):"
"invalidate failed. %d\n",
arg0, pt, ptep, *ptep, pgaddr, pgsize, error);
goto out;
}
error = 0;
out:
dkprintf("invalidate_one_page(%p,%p,%p %#lx,%p,%#lx):%d\n",
arg0, pt, ptep, *ptep, pgaddr, pgsize, error);
return error;
}
int invalidate_process_memory_range(struct process_vm *vm,
struct vm_range *range, uintptr_t start, uintptr_t end)
{
int error;
struct invalidate_args args;
dkprintf("invalidate_process_memory_range(%p,%p,%#lx,%#lx)\n",
vm, range, start, end);
args.range = range;
ihk_mc_spinlock_lock_noirq(&vm->page_table_lock);
memobj_lock(range->memobj);
error = visit_pte_range(vm->page_table, (void *)start, (void *)end,
VPTEF_SKIP_NULL, &invalidate_one_page, &args);
memobj_unlock(range->memobj);
ihk_mc_spinlock_unlock_noirq(&vm->page_table_lock);
if (error) {
ekprintf("invalidate_process_memory_range(%p,%p,%#lx,%#lx):"
"visit failed%d\n",
vm, range, start, end, error);
goto out;
}
out:
dkprintf("invalidate_process_memory_range(%p,%p,%#lx,%#lx):%d\n",
vm, range, start, end, error);
return error;
}
static int page_fault_process_memory_range(struct process_vm *vm, struct vm_range *range, uintptr_t fault_addr, uint64_t reason)
{
int error;