Commit f5e8fe2a authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

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: default avatarSean Christopherson <seanjc@google.com>
Reviewed-by: default avatarBen Gardon <bgardon@google.com>
Signed-off-by: default avatarDavid Matlack <dmatlack@google.com>
Message-Id: <20211111000310.1435032-11-dmatlack@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a5ac0fd1

tools/testing/selftests/kvm/lib/perf_test_util.c

+6 −2
Original line number Diff line number Diff line
@@ -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;