Subtract 1 to initialize GDT limit according to spec. Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx> --- tools/testing/selftests/kvm/lib/x86_64/processor.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index acfa1d01e7df..33ca7f5232a4 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -502,7 +502,12 @@ static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt) vm->gdt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA); dt->base = vm->gdt; - dt->limit = getpagesize(); + + /* + * Intel SDM Volume 3, 3.5.1: "the GDT limit should always be one less + * than an integral multiple of eight" + */ + dt->limit = getpagesize() - 1; } static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp, -- 2.39.0.314.g84b9a713c41-goog
