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authorSean Christopherson <seanjc@google.com>2021-11-11 00:03:08 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2021-11-16 07:43:27 -0500
commitf5e8fe2a92e4923b63d1edd6ed53d9856b6515ce (patch)
treec854fe4d9faebf34d44107e0d1c143beb367c253 /tools
parenta5ac0fd1b90ae811ba51da6a9928633bddefb792 (diff)
downloadlinux-f5e8fe2a92e4923b63d1edd6ed53d9856b6515ce.tar.bz2
KVM: selftests: Create VM with adjusted number of guest pages for perf tests
Use the already computed guest_num_pages when creating the so called extra VM pages for a perf test, and add a comment explaining why the pages are allocated as extra pages. Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Ben Gardon <bgardon@google.com> Signed-off-by: David Matlack <dmatlack@google.com> Message-Id: <20211111000310.1435032-11-dmatlack@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/kvm/lib/perf_test_util.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/perf_test_util.c
index a0aded8cfce3..b3154b5b0cfd 100644
--- a/tools/testing/selftests/kvm/lib/perf_test_util.c
+++ b/tools/testing/selftests/kvm/lib/perf_test_util.c
@@ -77,9 +77,13 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
"Guest memory cannot be evenly divided into %d slots.",
slots);
+ /*
+ * Pass guest_num_pages to populate the page tables for test memory.
+ * The memory is also added to memslot 0, but that's a benign side
+ * effect as KVM allows aliasing HVAs in meslots.
+ */
vm = vm_create_with_vcpus(mode, vcpus, DEFAULT_GUEST_PHY_PAGES,
- (vcpus * vcpu_memory_bytes) / pta->guest_page_size,
- 0, guest_code, NULL);
+ guest_num_pages, 0, guest_code, NULL);
pta->vm = vm;