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a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1793922452; l=3040; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=zQXICDUfkyOEjaQ9E9JzE6XP0PgFJvrAcKjCLLRv2PE=; b=++6VzU7tL+aM9iRm8j00/5V85eUN0JZ0BcvHYqocl+buUFvfNvnydmWJLpoiJC7HCuRMpkMxR x50Ds50F24LDNDjtcclc41/SVXvHrQHGmmELVCo9jjrlTVl90UlLMh6 X-Mailer: b4 0.14.3 Message-ID: <20261105-tdx-selftests-v16-14-2024e8fa517a@google.com> Subject: [PATCH v16 14/20] KVM: selftests: Set entry point for TDX guest code From: Lisa Wang To: Andrew Jones , Ackerley Tng , Binbin Wu , Chao Gao , Chenyi Qiang , Dave Hansen , Erdem Aktas , Ira Weiny , Isaku Yamahata , Kiryl Shutsemau , linux-kselftest@vger.kernel.org, Paolo Bonzini , "Pratik R. 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 9d951f67b3b5..1cc876891589 100644 --- a/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h +++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx_util.h @@ -72,5 +72,6 @@ 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_init(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 110d23e50bcc..11db6a3b0366 100644 --- a/tools/testing/selftests/kvm/lib/x86/processor.c +++ b/tools/testing/selftests/kvm/lib/x86/processor.c @@ -853,9 +853,13 @@ 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); + } } struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, u32 vcpu_id) 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 84127618f05c..324f3c41aa61 100644 --- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c @@ -118,6 +118,16 @@ void tdx_vcpu_init(struct kvm_vcpu *vcpu) tdx_vcpu_load_boot_parameters(vcpu); } +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; -- 2.56.0.455.g6c5a503b38-goog