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KVM: selftests: Setup vcpu_alias only for minor mode test

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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@redhat.com>
Reviewed-by: James Houghton <jthoughton@google.com>
Link: https://lore.kernel.org/r/20230427201112.2164776-2-peterx@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Peter Xu 2023-04-27 16:11:11 -04:00 committed by Sean Christopherson
parent 56f413f2cd
commit ba125de35d
1 changed files with 9 additions and 8 deletions
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17
tools/testing/selftests/kvm/demand_paging_test.c
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@ -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.