return;
if (type == UCALL_MMIO) {
- vm_paddr_t gpa, start, end, step;
+ vm_paddr_t gpa, start, end, step, offset;
bool ret;
if (arg) {
* KVM_EXIT_MMIO. Well, at least that's how it works for AArch64.
* Here we start with a guess that the addresses around two
* thirds of the VA space are unmapped and then work both down
- * and up from there in 1/6 VA space sized steps.
+ * and up from there in 1/12 VA space sized steps.
*/
start = 1ul << (vm->va_bits * 2 / 3);
end = 1ul << vm->va_bits;
- step = 1ul << (vm->va_bits / 6);
- for (gpa = start; gpa >= 0; gpa -= step) {
- if (ucall_mmio_init(vm, gpa & ~(vm->page_size - 1)))
+ step = 1ul << (vm->va_bits / 12);
+ for (offset = 0; offset < end - start; offset += step) {
+ if (ucall_mmio_init(vm, (gpa - offset) & ~(vm->page_size - 1)))
return;
- }
- for (gpa = start + step; gpa < end; gpa += step) {
- if (ucall_mmio_init(vm, gpa & ~(vm->page_size - 1)))
+ if (ucall_mmio_init(vm, (gpa + offset) & ~(vm->page_size - 1)))
return;
}
TEST_ASSERT(false, "Can't find a ucall mmio address");