From nobody Sun Oct 5 07:26:07 2025 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F213427CB38 for ; Thu, 7 Aug 2025 20:17:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754597830; cv=none; b=S5KGay6UMUIMcnw18kceGzdDt2s+WhwOYEZJ359ojWbQHTpfrZyKjuU688thQ2DlhCpjwLZ1zdLozi+h/uC8q4ucU3U6Ts7MIzY20oWclOLF/Fc2qBhwlZBSZbdQNKUzxv4LWp3oHL5B7qZrnCpz9uwjI6b8R2fe5IuCxWJhxx0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754597830; c=relaxed/simple; bh=NkZ9cw2OQkpKTyBr6XnTKZKOxHkmBwe+wNgxb8ukCTo=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=PCa6+BYatyeauzs5cpfOzaGx7yv5cbd85hrP1uw2Kc8g3FgGod3aIEYzGT3PiKD16XNcRMHk5sKzMhp9OgqiXLClmsVMXaaWzLJsHRknse+ukcnfrImwmc8mcD7jT5wr1xxFx1GVFmwN5AMllNyVjmqjybHjShANMIPeuU3HZ5E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--sagis.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=CIsxf155; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--sagis.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CIsxf155" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-31f4d0f60caso1435642a91.1 for ; Thu, 07 Aug 2025 13:17:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1754597826; x=1755202626; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=lGXEvvh28CILFU8veFYJPuuhWeDvdlK202GCjoHljc0=; b=CIsxf155Nn4ORlGN3obiaE94G2wj22Vnm3QOGfkzU+dflRorlXhpJj3o4NwdZnUoAI nE0jXotWm++qCYJk1ZzCFZ8hD7zWY4ugI5YNrC1nJgts5hkNij6JGj6U3DUzKpcEs6OW uEtnAW0fsLncJBl61evYtczbH+LIHqWKMhGQFBNg/Tohuo9mek5Lv+xml8bsSGZSZ+bp bbBeIjwZdNeoai28uLAY290UKIdFyaBIkNHwBemAT2bxpUHkqpRPGyJ4K+qMq5djtF50 0dgXkMYpoGJLN6tDAb4dh7NfZARWP8o0hmdrobGuRmO+ieHRaxLjR/EcoVomAsUviWnX Zlnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754597826; x=1755202626; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=lGXEvvh28CILFU8veFYJPuuhWeDvdlK202GCjoHljc0=; b=KLcZKMZly9X1pjifJhqJwCLQuC3QD8x0New+e8ZF/ejuNuha90CN9CobG9v2M8kmc9 200HpdebQGl/bTTmAzsLjgM1M07yc8PCaHAybh0h0C7ed8W2SfOrc3kWSsl0mQeuLix1 3ViyhitDTbWtPhZmM18t/Mx3XMPgM25+m3znUQvTienp4UmZJwS17jwhjt9a51m/Oazm bzjk+41Jujw4fo5sRZxg2KBNHfknMlHYDzOvbcCdig/AuXK3dfokZjYG4q1QbOCxOmmT k7UGqnZKPdehrzU6EMUqwhzzoLP5jVqSG8yayMni4wUDJLnXKwHiMXLzadjzft2kZ5j7 YJdQ== X-Gm-Message-State: AOJu0Ywin6n311pwIR2Lzb51RX+yY84Gz8VXHOC+9riqmIcCeE/2LYe6 2WWBWtBm42t4lMQ0aBHv56ybrhTRNMOTK0rJiAMfMfArCffvsBnuoSFUGIaBf3mZcbtwHGcDIuR F2w== X-Google-Smtp-Source: AGHT+IEt1bokf2gwgVn7hdK2GrWh3MEGT0E9AT9JiLMbohoSe5t35nvuUxv5BuJLVfGUiWauYYMf6L5SXw== X-Received: from pjph9.prod.google.com ([2002:a17:90a:9c09:b0:320:e3e2:6877]) (user=sagis job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:5249:b0:320:ff84:ceb5 with SMTP id 98e67ed59e1d1-32183b3f039mr501997a91.16.1754597826341; Thu, 07 Aug 2025 13:17:06 -0700 (PDT) Date: Thu, 7 Aug 2025 13:16:15 -0700 In-Reply-To: <20250807201628.1185915-1-sagis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250807201628.1185915-1-sagis@google.com> X-Mailer: git-send-email 2.51.0.rc0.155.g4a0f42376b-goog Message-ID: <20250807201628.1185915-20-sagis@google.com> Subject: [PATCH v8 19/30] KVM: selftests: TDX: Add TDX MMIO writes test From: Sagi Shahar To: linux-kselftest@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sean Christopherson , Ackerley Tng , Ryan Afranji , Andrew Jones , Isaku Yamahata , Erdem Aktas , Rick Edgecombe , Sagi Shahar , Roger Wang , Binbin Wu , Oliver Upton , "Pratik R. Sampat" , Reinette Chatre , Ira Weiny Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The test verifies MMIO writes of various sizes from the guest to the host. Co-developed-by: Isaku Yamahata Signed-off-by: Isaku Yamahata Signed-off-by: Sagi Shahar --- .../selftests/kvm/include/x86/tdx/tdx.h | 2 + tools/testing/selftests/kvm/lib/x86/tdx/tdx.c | 14 +++ tools/testing/selftests/kvm/x86/tdx_vm_test.c | 85 ++++++++++++++++++- 3 files changed, 100 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx.h b/tools/test= ing/selftests/kvm/include/x86/tdx/tdx.h index fa0b24873a8f..2fd67c3e5128 100644 --- a/tools/testing/selftests/kvm/include/x86/tdx/tdx.h +++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h @@ -25,5 +25,7 @@ uint64_t tdg_vp_vmcall_instruction_wrmsr(uint64_t index, = uint64_t value); uint64_t tdg_vp_vmcall_instruction_hlt(uint64_t interrupt_blocked_flag); uint64_t tdg_vp_vmcall_ve_request_mmio_read(uint64_t address, uint64_t siz= e, uint64_t *data_out); +uint64_t tdg_vp_vmcall_ve_request_mmio_write(uint64_t address, uint64_t si= ze, + uint64_t data_in); =20 #endif // SELFTEST_TDX_TDX_H diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c b/tools/testing/= selftests/kvm/lib/x86/tdx/tdx.c index 8bf41e667fc1..d61940fe7df4 100644 --- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c @@ -123,3 +123,17 @@ uint64_t tdg_vp_vmcall_ve_request_mmio_read(uint64_t a= ddress, uint64_t size, =20 return ret; } + +uint64_t tdg_vp_vmcall_ve_request_mmio_write(uint64_t address, uint64_t si= ze, + uint64_t data_in) +{ + struct tdx_hypercall_args args =3D { + .r11 =3D TDG_VP_VMCALL_VE_REQUEST_MMIO, + .r12 =3D size, + .r13 =3D MMIO_WRITE, + .r14 =3D address, + .r15 =3D data_in, + }; + + return __tdx_hypercall(&args, 0); +} diff --git a/tools/testing/selftests/kvm/x86/tdx_vm_test.c b/tools/testing/= selftests/kvm/x86/tdx_vm_test.c index 563f1025c8a3..6ad675a93eeb 100644 --- a/tools/testing/selftests/kvm/x86/tdx_vm_test.c +++ b/tools/testing/selftests/kvm/x86/tdx_vm_test.c @@ -804,6 +804,87 @@ void verify_mmio_reads(void) printf("\t ... PASSED\n"); } =20 +void guest_mmio_writes(void) +{ + uint64_t mmio_test_addr =3D TDX_MMIO_TEST_ADDR | tdx_s_bit; + uint64_t ret; + + ret =3D tdg_vp_vmcall_ve_request_mmio_write(mmio_test_addr, 1, 0x12); + tdx_assert_error(ret); + + ret =3D tdg_vp_vmcall_ve_request_mmio_write(mmio_test_addr, 2, 0x1234); + tdx_assert_error(ret); + + ret =3D tdg_vp_vmcall_ve_request_mmio_write(mmio_test_addr, 4, 0x12345678= ); + tdx_assert_error(ret); + + ret =3D tdg_vp_vmcall_ve_request_mmio_write(mmio_test_addr, 8, 0x12345678= 90ABCDEF); + tdx_assert_error(ret); + + /* Make sure host and guest are synced to the same point of execution */ + tdx_test_report_to_user_space(MMIO_SYNC_VALUE); + + /* Write across page boundary. */ + ret =3D tdg_vp_vmcall_ve_request_mmio_write(PAGE_SIZE - 1, 8, 0); + tdx_assert_error(ret); + + tdx_test_success(); +} + +/* + * Verifies guest MMIO writes. + */ +void verify_mmio_writes(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + uint64_t byte_8; + uint32_t byte_4; + uint16_t byte_2; + uint8_t byte_1; + + vm =3D td_create(); + td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0); + vcpu =3D td_vcpu_add(vm, 0, guest_mmio_writes); + td_finalize(vm); + + printf("Verifying TD MMIO writes:\n"); + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 1, MMIO_WRITE); + byte_1 =3D *(uint8_t *)(vcpu->run->mmio.data); + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 2, MMIO_WRITE); + byte_2 =3D *(uint16_t *)(vcpu->run->mmio.data); + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 4, MMIO_WRITE); + byte_4 =3D *(uint32_t *)(vcpu->run->mmio.data); + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 8, MMIO_WRITE); + byte_8 =3D *(uint64_t *)(vcpu->run->mmio.data); + + TEST_ASSERT_EQ(byte_1, 0x12); + TEST_ASSERT_EQ(byte_2, 0x1234); + TEST_ASSERT_EQ(byte_4, 0x12345678); + TEST_ASSERT_EQ(byte_8, 0x1234567890ABCDEF); + + tdx_run(vcpu); + TEST_ASSERT_EQ(tdx_test_read_report_from_guest(vcpu), MMIO_SYNC_VALUE); + + td_vcpu_run(vcpu); + TEST_ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_SYSTEM_EVENT); + TEST_ASSERT_EQ(vcpu->run->system_event.data[12], TDG_VP_VMCALL_INVALID_OP= ERAND); + + tdx_run(vcpu); + tdx_test_assert_success(vcpu); + + kvm_vm_free(vm); + printf("\t ... PASSED\n"); +} + int main(int argc, char **argv) { ksft_print_header(); @@ -811,7 +892,7 @@ int main(int argc, char **argv) if (!is_tdx_enabled()) ksft_exit_skip("TDX is not supported by the KVM. Exiting.\n"); =20 - ksft_set_plan(11); + ksft_set_plan(12); ksft_test_result(!run_in_new_process(&verify_td_lifecycle), "verify_td_lifecycle\n"); ksft_test_result(!run_in_new_process(&verify_report_fatal_error), @@ -834,6 +915,8 @@ int main(int argc, char **argv) "verify_guest_hlt\n"); ksft_test_result(!run_in_new_process(&verify_mmio_reads), "verify_mmio_reads\n"); + ksft_test_result(!run_in_new_process(&verify_mmio_writes), + "verify_mmio_writes\n"); =20 ksft_finished(); return 0; --=20 2.51.0.rc0.155.g4a0f42376b-goog