Commit 1ddd3ea7 authored by Sean Christopherson's avatar Sean Christopherson
Browse files

KVM: selftests: Compute number of extra pages needed in mmu_stress_test 



Create mmu_stress_tests's VM with the correct number of extra pages needed
to map all of memory in the guest.  The bug hasn't been noticed before as
the test currently runs only on x86, which maps guest memory with 1GiB
pages, i.e. doesn't need much memory in the guest for page tables.

Reviewed-by: default avatarJames Houghton <jthoughton@google.com>
Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20241128005547.4077116-8-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 55e164df

tools/testing/selftests/kvm/mmu_stress_test.c

+7 −1
Original line number Diff line number Diff line
@@ -209,7 +209,13 @@ int main(int argc, char *argv[]) 
	vcpus = malloc(nr_vcpus * sizeof(*vcpus));

	TEST_ASSERT(vcpus, "Failed to allocate vCPU array");



	vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);

	vm = __vm_create_with_vcpus(VM_SHAPE_DEFAULT, nr_vcpus,

#ifdef __x86_64__

				    max_mem / SZ_1G,

#else

				    max_mem / vm_guest_mode_params[VM_MODE_DEFAULT].page_size,

#endif

				    guest_code, vcpus);



	max_gpa = vm->max_gfn << vm->page_shift;

	TEST_ASSERT(max_gpa > (4 * slot_size), "MAXPHYADDR <4gb ");