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remote_flush_tlb_array_cpumask(): bundle remote TLB invalidations

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This commit is contained in:
Balazs Gerofi
2017-07-21 15:34:48 +09:00
parent bc423255d9
commit bf5ac7afc8
3 changed files with 97 additions and 43 deletions
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57
arch/x86/kernel/memory.c
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@ -1077,8 +1077,27 @@ struct clear_range_args {
int free_physical;
struct memobj *memobj;
struct process_vm *vm;
unsigned long *addr;
int nr_addr;
int max_nr_addr;
};
static void remote_flush_tlb_add_addr(struct clear_range_args *args,
unsigned long addr)
{
if (args->nr_addr < args->max_nr_addr) {
args->addr[args->nr_addr] = addr;
++args->nr_addr;
return;
}
remote_flush_tlb_array_cpumask(args->vm, args->addr, args->nr_addr,
ihk_mc_get_processor_id());
args->addr[0] = addr;
args->nr_addr = 1;
}
static int clear_range_l1(void *args0, pte_t *ptep, uint64_t base,
uint64_t start, uint64_t end)
{
@ -1092,7 +1111,7 @@ static int clear_range_l1(void *args0, pte_t *ptep, uint64_t base,
}
old = xchg(ptep, PTE_NULL);
remote_flush_tlb_cpumask(args->vm, base, ihk_mc_get_processor_id());
remote_flush_tlb_add_addr(args, base);
page = NULL;
if (!pte_is_fileoff(&old, PTL1_SIZE)) {
@ -1141,8 +1160,7 @@ static int clear_range_l2(void *args0, pte_t *ptep, uint64_t base,
if (*ptep & PFL2_SIZE) {
old = xchg(ptep, PTE_NULL);
remote_flush_tlb_cpumask(args->vm, base,
ihk_mc_get_processor_id());
remote_flush_tlb_add_addr(args, base);
page = NULL;
if (!pte_is_fileoff(&old, PTL2_SIZE)) {
@ -1174,8 +1192,7 @@ static int clear_range_l2(void *args0, pte_t *ptep, uint64_t base,
if ((start <= base) && ((base + PTL2_SIZE) <= end)) {
*ptep = PTE_NULL;
remote_flush_tlb_cpumask(args->vm, base,
ihk_mc_get_processor_id());
remote_flush_tlb_add_addr(args, base);
ihk_mc_free_pages(pt, 1);
}
@ -1207,8 +1224,7 @@ static int clear_range_l3(void *args0, pte_t *ptep, uint64_t base,
if (*ptep & PFL3_SIZE) {
old = xchg(ptep, PTE_NULL);
remote_flush_tlb_cpumask(args->vm, base,
ihk_mc_get_processor_id());
remote_flush_tlb_add_addr(args, base);
page = NULL;
if (!pte_is_fileoff(&old, PTL3_SIZE)) {
@ -1239,8 +1255,7 @@ static int clear_range_l3(void *args0, pte_t *ptep, uint64_t base,
if (use_1gb_page && (start <= base) && ((base + PTL3_SIZE) <= end)) {
*ptep = PTE_NULL;
remote_flush_tlb_cpumask(args->vm, base,
ihk_mc_get_processor_id());
remote_flush_tlb_add_addr(args, base);
ihk_mc_free_pages(pt, 1);
}
@ -1260,8 +1275,10 @@ static int clear_range_l4(void *args0, pte_t *ptep, uint64_t base,
return walk_pte_l3(pt, base, start, end, &clear_range_l3, args0);
}
static int clear_range(struct page_table *pt, struct process_vm *vm,
uintptr_t start, uintptr_t end, int free_physical,
#define TLB_INVALID_ARRAY_PAGES (4)
static int clear_range(struct page_table *pt, struct process_vm *vm,
uintptr_t start, uintptr_t end, int free_physical,
struct memobj *memobj)
{
int error;
@ -1276,6 +1293,17 @@ static int clear_range(struct page_table *pt, struct process_vm *vm,
return -EINVAL;
}
/* TODO: embedd this in tlb_flush_entry? */
args.addr = (unsigned long *)ihk_mc_alloc_pages(
TLB_INVALID_ARRAY_PAGES, IHK_MC_AP_CRITICAL);
if (!args.addr) {
ekprintf("%s: error: allocating address array\n", __FUNCTION__);
return -ENOMEM;
}
args.nr_addr = 0;
args.max_nr_addr = (TLB_INVALID_ARRAY_PAGES * PAGE_SIZE /
sizeof(uint64_t));
args.free_physical = free_physical;
if (memobj && (memobj->flags & MF_DEV_FILE)) {
args.free_physical = 0;
@ -1287,6 +1315,13 @@ static int clear_range(struct page_table *pt, struct process_vm *vm,
args.vm = vm;
error = walk_pte_l4(pt, 0, start, end, &clear_range_l4, &args);
if (args.nr_addr) {
remote_flush_tlb_array_cpumask(vm, args.addr, args.nr_addr,
ihk_mc_get_processor_id());
}
ihk_mc_free_pages(args.addr, TLB_INVALID_ARRAY_PAGES);
return error;
}