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Date: Thu, 16 Mar 2023 00:31:01 +0000
From: Ackerley Tng <ackerleytng@...gle.com>
To: kvm@...r.kernel.org, linux-api@...r.kernel.org,
linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, qemu-devel@...gnu.org
Cc: aarcange@...hat.com, ak@...ux.intel.com, akpm@...ux-foundation.org,
arnd@...db.de, bfields@...ldses.org, bp@...en8.de,
chao.p.peng@...ux.intel.com, corbet@....net, dave.hansen@...el.com,
david@...hat.com, ddutile@...hat.com, dhildenb@...hat.com,
hpa@...or.com, hughd@...gle.com, jlayton@...nel.org,
jmattson@...gle.com, joro@...tes.org, jun.nakajima@...el.com,
kirill.shutemov@...ux.intel.com, linmiaohe@...wei.com,
luto@...nel.org, mail@...iej.szmigiero.name, mhocko@...e.com,
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wei.w.wang@...el.com, x86@...nel.org, yu.c.zhang@...ux.intel.com,
Ackerley Tng <ackerleytng@...gle.com>
Subject: [RFC PATCH 08/10] KVM: selftests: Default private_mem_conversions_test
to use 1 restrictedmem file for test data
Default the private/shared memory conversion tests to use a single
file (when multiple memslots are requested), while executing on
multiple vCPUs in parallel, to stress-test the restrictedmem subsystem.
Also add a flag to allow multiple files to be used.
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
.../kvm/x86_64/private_mem_conversions_test.c | 52 ++++++++++++++-----
1 file changed, 38 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/kvm/x86_64/private_mem_conversions_test.c b/tools/testing/selftests/kvm/x86_64/private_mem_conversions_test.c
index afaf8d0e52e6..ca30f0f05c39 100644
--- a/tools/testing/selftests/kvm/x86_64/private_mem_conversions_test.c
+++ b/tools/testing/selftests/kvm/x86_64/private_mem_conversions_test.c
@@ -324,7 +324,8 @@ void *thread_function(void *input)
}
static void add_memslot_for_vcpu(
- struct kvm_vm *vm, enum vm_mem_backing_src_type src_type, uint8_t vcpu_id)
+ struct kvm_vm *vm, enum vm_mem_backing_src_type src_type, uint8_t vcpu_id,
+ int restrictedmem_fd, uint64_t restrictedmem_offset)
{
uint64_t gpa = data_gpa_base_for_vcpu_id(vcpu_id);
uint32_t slot = DATA_SLOT_BASE + vcpu_id;
@@ -336,7 +337,8 @@ static void add_memslot_for_vcpu(
static void test_mem_conversions(enum vm_mem_backing_src_type src_type,
uint8_t nr_vcpus, uint32_t iterations,
- bool use_multiple_memslots)
+ bool use_multiple_memslots,
+ bool use_different_restrictedmem_files)
{
struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
pthread_t threads[KVM_MAX_VCPUS];
@@ -356,21 +358,28 @@ static void test_mem_conversions(enum vm_mem_backing_src_type src_type,
vm_enable_cap(vm, KVM_CAP_EXIT_HYPERCALL, (1 << KVM_HC_MAP_GPA_RANGE));
npages_for_all_vcpus = DATA_SIZE / vm->page_size * nr_vcpus;
+ virt_map(vm, DATA_GPA_BASE, DATA_GPA_BASE, npages_for_all_vcpus);
if (use_multiple_memslots) {
- for (i = 0; i < nr_vcpus; i++)
- add_memslot_for_vcpu(vm, src_type, i);
+ int fd = memfd_restricted(0);
+ int offset = 0;
+
+ for (i = 0; i < nr_vcpus; i++) {
+ if (use_different_restrictedmem_files) {
+ if (i > 0)
+ fd = memfd_restricted(0);
+ } else {
+ offset = i * DATA_GPA_SPACING;
+ }
+
+ add_memslot_for_vcpu(vm, src_type, i, fd, offset);
+ }
} else {
vm_userspace_mem_region_add(
vm, src_type, DATA_GPA_BASE, DATA_SLOT_BASE,
npages_for_all_vcpus, KVM_MEM_PRIVATE);
}
- virt_map(vm, DATA_GPA_BASE, DATA_GPA_BASE, npages_for_all_vcpus);
-
- for (i = 0; i < nr_vcpus; i++)
- add_memslot_for_vcpu(vm, src_type, i);
-
for (i = 0; i < nr_vcpus; i++) {
args[i].vm = vm;
args[i].vcpu = vcpus[i];
@@ -382,7 +391,7 @@ static void test_mem_conversions(enum vm_mem_backing_src_type src_type,
for (i = 0; i < nr_vcpus; i++)
pthread_join(threads[i], NULL);
- if (!use_multiple_memslots)
+ if (!use_multiple_memslots || !use_different_restrictedmem_files)
test_invalidation_code_unbound(vm, 1, DATA_SIZE * nr_vcpus);
else
test_invalidation_code_unbound(vm, nr_vcpus, DATA_SIZE);
@@ -391,8 +400,9 @@ static void test_mem_conversions(enum vm_mem_backing_src_type src_type,
static void usage(const char *command)
{
puts("");
- printf("usage: %s [-h] [-m] [-s mem-type] [-n number-of-vcpus] [-i number-of-iterations]\n",
- command);
+ printf("usage: %s\n", command);
+ printf(" [-h] [-m] [-f] [-s mem-type]\n");
+ printf(" [-n number-of-vcpus] [-i number-of-iterations]\n");
puts("");
backing_src_help("-s");
puts("");
@@ -404,6 +414,9 @@ static void usage(const char *command)
puts("");
puts(" -m: use multiple memslots (default: use 1 memslot)");
puts("");
+ puts(" -f: use different restrictedmem files for each memslot");
+ puts(" (default: use 1 restrictedmem file for all memslots)");
+ puts("");
}
int main(int argc, char *argv[])
@@ -412,12 +425,13 @@ int main(int argc, char *argv[])
uint8_t nr_vcpus = 2;
uint32_t iterations = 10;
bool use_multiple_memslots = false;
+ bool use_different_restrictedmem_files = false;
int opt;
TEST_REQUIRE(kvm_has_cap(KVM_CAP_EXIT_HYPERCALL));
TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_PROTECTED_VM));
- while ((opt = getopt(argc, argv, "mhs:n:i:")) != -1) {
+ while ((opt = getopt(argc, argv, "fmhs:n:i:")) != -1) {
switch (opt) {
case 'n':
nr_vcpus = atoi_positive("nr_vcpus", optarg);
@@ -431,6 +445,9 @@ int main(int argc, char *argv[])
case 'm':
use_multiple_memslots = true;
break;
+ case 'f':
+ use_different_restrictedmem_files = true;
+ break;
case 'h':
default:
usage(argv[0]);
@@ -438,6 +455,13 @@ int main(int argc, char *argv[])
}
}
- test_mem_conversions(src_type, nr_vcpus, iterations, use_multiple_memslots);
+ if (!use_multiple_memslots && use_different_restrictedmem_files) {
+ printf("Overriding -f flag: ");
+ puts("Using just 1 restrictedmem file since only 1 memslot is to be used.");
+ use_different_restrictedmem_files = false;
+ }
+
+ test_mem_conversions(src_type, nr_vcpus, iterations, use_multiple_memslots,
+ use_different_restrictedmem_files);
return 0;
}
--
2.40.0.rc2.332.ga46443480c-goog
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