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Sampat" , Reinette Chatre , Rick Edgecombe , Roger Wang , Ryan Afranji , Sagi Shahar , Sean Christopherson , Shuah Khan , Xiaoyao Li , Oliver Upton Cc: Jeremiah McReynolds , kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, x86@kernel.org, Lisa Wang Content-Type: text/plain; charset="utf-8" From: Sagi Shahar Since the rip register is inaccessible for TDX VMs, we need a different way to set the guest entry point for TDX VMs. This is done by writing the guest code address to a predefined location in the guest memory and loading it into rip as part of the TDX boot code. Signed-off-by: Sagi Shahar Signed-off-by: Lisa Wang Reviewed-by: Xiaoyao Li Reviewed-by: Binbin Wu --- tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h | 1 + tools/testing/selftests/kvm/lib/x86/processor.c | 10 +++++++--- tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c | 10 ++++++++++ 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h index 72497724a2ee..f36cddbd045c 100644 --- a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h +++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h @@ -71,5 +71,6 @@ void tdx_vm_setup_boot_code_region(struct kvm_vm *vm); void tdx_vm_setup_boot_parameters_region(struct kvm_vm *vm, u32 nr_runnable_vcpus); void tdx_vm_load_common_boot_parameters(struct kvm_vm *vm); void tdx_vcpu_load_boot_parameters(struct kvm_vm *vm, struct kvm_vcpu *vcpu); +void tdx_vcpu_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code); #endif /* SELFTESTS_TDX_TDX_UTIL_H */ diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testing/selftests/kvm/lib/x86/processor.c index 2d2160d68b9b..b4b76dc505ae 100644 --- a/tools/testing/selftests/kvm/lib/x86/processor.c +++ b/tools/testing/selftests/kvm/lib/x86/processor.c @@ -846,9 +846,13 @@ void vcpu_arch_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code) { struct kvm_regs regs; - vcpu_regs_get(vcpu, ®s); - regs.rip = (unsigned long) guest_code; - vcpu_regs_set(vcpu, ®s); + if (is_tdx_vm(vcpu->vm)) { + tdx_vcpu_set_entry_point(vcpu, guest_code); + } else { + vcpu_regs_get(vcpu, ®s); + regs.rip = (unsigned long)guest_code; + vcpu_regs_set(vcpu, ®s); + } } gva_t kvm_allocate_vcpu_stack(struct kvm_vm *vm) diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c index 270a4ee1b7eb..5f10a7c1455d 100644 --- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c @@ -102,6 +102,16 @@ void tdx_vcpu_load_boot_parameters(struct kvm_vm *vm, struct kvm_vcpu *vcpu) "ESP GVA must be within 32-bit address space for 32-bit boot code"); } +void tdx_vcpu_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code) +{ + struct td_boot_parameters *params = + addr_gpa2hva(vcpu->vm, TD_BOOT_PARAMETERS_GPA); + struct td_per_vcpu_parameters *vcpu_params = + ¶ms->per_vcpu[vcpu->id]; + + vcpu_params->guest_code = (u64)guest_code; +} + static const struct kvm_tdx_capabilities *tdx_read_capabilities(struct kvm_vm *vm) { static struct kvm_tdx_capabilities *tdx_cap; -- 2.56.0.rc1.315.gc6ed9934b7-goog