This fixes two things:
- Unbreaks MISSING mode test on anonymous memory type
- Prefault alias mem before uffd thread creations, otherwise the uffd
thread timing will be inaccurate when guest mem size is large, because
it'll take prefault time into total time.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
.../testing/selftests/kvm/demand_paging_test.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index 2439c4043fed..9c18686b4f63 100644
--- a/tools/testing/selftests/kvm/demand_paging_test.c
+++ b/tools/testing/selftests/kvm/demand_paging_test.c
@@ -128,6 +128,7 @@ static void prefault_mem(void *alias, uint64_t len)
static void run_test(enum vm_guest_mode mode, void *arg)
{
+ struct memstress_vcpu_args *vcpu_args;
struct test_params *p = arg;
struct uffd_desc **uffd_descs = NULL;
struct timespec start;
@@ -145,24 +146,24 @@ static void run_test(enum vm_guest_mode mode, void *arg)
"Failed to allocate buffer for guest data pattern");
memset(guest_data_prototype, 0xAB, demand_paging_size);
+ if (p->uffd_mode == UFFDIO_REGISTER_MODE_MINOR) {
+ for (i = 0; i < nr_vcpus; i++) {
+ vcpu_args = &memstress_args.vcpu_args[i];
+ prefault_mem(addr_gpa2alias(vm, vcpu_args->gpa),
+ vcpu_args->pages * memstress_args.guest_page_size);
+ }
+ }
+
if (p->uffd_mode) {
uffd_descs = malloc(nr_vcpus * sizeof(struct uffd_desc *));
TEST_ASSERT(uffd_descs, "Memory allocation failed");
-
for (i = 0; i < nr_vcpus; i++) {
- struct memstress_vcpu_args *vcpu_args;
void *vcpu_hva;
- void *vcpu_alias;
vcpu_args = &memstress_args.vcpu_args[i];
/* Cache the host addresses of the region */
vcpu_hva = addr_gpa2hva(vm, vcpu_args->gpa);
- vcpu_alias = addr_gpa2alias(vm, vcpu_args->gpa);
-
- prefault_mem(vcpu_alias,
- vcpu_args->pages * memstress_args.guest_page_size);
-
/*
* Set up user fault fd to handle demand paging
* requests.
--
2.39.1
