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

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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: James Houghton <jthoughton@google.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20241128005547.4077116-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-11-27 16:55:38 -08:00
parent 55e164df48
commit 1ddd3ea75a
1 changed files with 7 additions and 1 deletions
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8
tools/testing/selftests/kvm/mmu_stress_test.c
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@ -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 ");