From: Ackerley Tng ackerleytng@google.com
TDX guests' registers cannot be initialized directly using vcpu_regs_set(), hence the stack pointer needs to be initialized by the guest itself, running boot code beginning at the reset vector.
We store the stack address as part of struct kvm_vcpu so that it can be accessible later to be passed to the boot code for rsp initialization.
Signed-off-by: Ackerley Tng ackerleytng@google.com Change-Id: I54e7bde72c5c21e7d8944415ac5818d9443e2b70 Signed-off-by: Ryan Afranji afranji@google.com --- tools/testing/selftests/kvm/include/kvm_util_base.h | 1 + tools/testing/selftests/kvm/lib/x86_64/processor.c | 4 +++- 2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index a07ce5f5244a..12524d94a4eb 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -67,6 +67,7 @@ struct kvm_vcpu { int fd; struct kvm_vm *vm; struct kvm_run *run; + vm_vaddr_t initial_stack_addr; #ifdef __x86_64__ struct kvm_cpuid2 *cpuid; #endif diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index e3a9366d4f80..78dd918b9a92 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -607,10 +607,12 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, vcpu_init_cpuid(vcpu, kvm_get_supported_cpuid()); vcpu_setup(vm, vcpu);
+ vcpu->initial_stack_addr = stack_vaddr; + /* Setup guest general purpose registers */ vcpu_regs_get(vcpu, ®s); regs.rflags = regs.rflags | 0x2; - regs.rsp = stack_vaddr; + regs.rsp = vcpu->initial_stack_addr; regs.rip = (unsigned long) guest_code; vcpu_regs_set(vcpu, ®s);