From nobody Fri Oct 10 13:44:20 2025 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (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 36ACA2E6D13 for ; Fri, 13 Jun 2025 19:14:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749842086; cv=none; b=s8IHJzbYja5YvA//0PUGMnSDXNQPSZpLzVU4yzwKOOHR/MqGIO4OJsNAjWyBXBnzQWN88byI3g/X+fiHXqE2WKUzufZaop9srxEoAysJ133z9IhS9EFLQjYLVSXvSqpAr6QP7p8OWPVo8xvqlqcnM1OPfuZtSuYfjgDeI7Ud+mE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749842086; c=relaxed/simple; bh=ZDHbd532GCXq4+Wx1lJLULWSC4TyKkWgWdn+qq+pg3M=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Tyn3gSbIk4tyF/xq+Kfa7B2BqQBpvuVWCgq1E6lORD93+9OfNtxyWUDecON1bOJE9fJjEOhOHbtDcn1oPvjCr+7Y/W1hQR/hcDrwq7Efin4+P7oL0EslAvOHPJLtVN1+EA7zg4N2U3M3RCo8mtHjsz1YLkWlbEFlSriYc7L/Q28= 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=clpE+JMA; arc=none smtp.client-ip=209.85.214.201 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="clpE+JMA" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-234b133b428so17248455ad.3 for ; Fri, 13 Jun 2025 12:14:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1749842084; x=1750446884; 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=sSem4my8PEVCL1FyWJdYHzfToitzpttknCPI+ZxEpoM=; b=clpE+JMAGI4tNpZIa2F739kls23FI7gJZvNq30Np5mUr5EPCcPpb6ne3gv7Nnb1eS9 3CBzkrVNfhXQr+t/uHGBSz6/9Q/Uv9/3b2tYEAP67R1QKQ0OIx4oQ107j0mxfor49qW3 joG9UxH5dCdb1ybFFOkOTio20+h1Q+Vs9h9uK4etSX9TFjR8VYBk3uA3wWI6QYWhub5S 5BCtqRE5aOsD55Ev7BrLOuVqmBM3T73P06CbEtCP6gOxyJPiwDqm6Kg6c6yV6YwRIqrj N4iqdh04kZLhc0GzN7KBQF4cIJgxKrXhrOTbuR8I9loP62tUot/XRsqxiJY61exWRi8t VJVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749842084; x=1750446884; 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=sSem4my8PEVCL1FyWJdYHzfToitzpttknCPI+ZxEpoM=; b=RHSRaEwBb5yQJUMQR30y0fHYWAdThFKcbXZBHN6xwR/bSGpLAD5WSueyMoWY2FAOBr HeACnDN4UzcMC1DXR+ea5MJxfWFlfvnH2GHnGPn0hb+4yGHuwC55UJpr1fednz6Ly9Yk JnyBSfNvd/bMbGGkeGutJuAbtSg/UDIg+VtxrEy5bXxKrMjxZY9Sn/mgqdVn0Wwdevv4 IeJY/Dv/cP8Ql5cCMz5lGbRWx4Gf809eJSrYDfi9yH7zsltuXf+EuDsplNbVzAp3BLC1 uugglMjwoJrwwv91jvLyb1k6mnKVrN6yuWuZ2K73RWvV21zWAYTvFAzoqLtBo3UBKA4X anTA== X-Gm-Message-State: AOJu0Yyxb3Khp/vCOkOlHlieP9yk2q+EygOa1RbsLNl33kYMQlIrtO1A pp16x95aOLLPEskwdjvesZ/saEN85dNjprBF08sb0HofNChhKyEDUUnoZ0IvD95qkfH30FJzzC1 8fA== X-Google-Smtp-Source: AGHT+IHoFi2FEXxt6RGl8CP0XU+1XYYnXNl8HBy73IZAP7OdJlDmHDOpVJoQYvp/U3PxFXoTzi0LO4LOEA== X-Received: from pjgg14.prod.google.com ([2002:a17:90b:57ce:b0:2fc:2c9c:880]) (user=sagis job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:d487:b0:234:c8f6:1afb with SMTP id d9443c01a7336-2366aeea601mr11815165ad.0.1749842084414; Fri, 13 Jun 2025 12:14:44 -0700 (PDT) Date: Fri, 13 Jun 2025 12:13:48 -0700 In-Reply-To: <20250613191359.35078-1-sagis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250613191359.35078-1-sagis@google.com> X-Mailer: git-send-email 2.50.0.rc2.692.g299adb8693-goog Message-ID: <20250613191359.35078-22-sagis@google.com> Subject: [PATCH v7 21/30] KVM: selftests: TDX: Verify the behavior when host consumes a TD private memory 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 Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ryan Afranji The test checks that host can only read fixed values when trying to access the guest's private memory. Signed-off-by: Ryan Afranji Signed-off-by: Sagi Shahar --- tools/testing/selftests/kvm/x86/tdx_vm_test.c | 83 ++++++++++++++++++- 1 file changed, 82 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/x86/tdx_vm_test.c b/tools/testing/= selftests/kvm/x86/tdx_vm_test.c index 2f75f12d2a44..b6ef0348746c 100644 --- a/tools/testing/selftests/kvm/x86/tdx_vm_test.c +++ b/tools/testing/selftests/kvm/x86/tdx_vm_test.c @@ -959,6 +959,85 @@ void verify_td_cpuid_tdcall(void) printf("\t ... PASSED\n"); } =20 +/* + * Shared variables between guest and host for host reading private mem te= st + */ +static uint64_t tdx_test_host_read_private_mem_addr; +#define TDX_HOST_READ_PRIVATE_MEM_PORT_TEST 0x53 + +void guest_host_read_priv_mem(void) +{ + uint64_t placeholder =3D 0; + uint64_t ret; + + /* Set value */ + *((uint32_t *)tdx_test_host_read_private_mem_addr) =3D 0xABCD; + + /* Exit so host can read value */ + ret =3D tdg_vp_vmcall_instruction_io(TDX_HOST_READ_PRIVATE_MEM_PORT_TEST, + 4, PORT_WRITE, &placeholder); + tdx_assert_error(ret); + + /* Update guest_var's value and have host reread it. */ + *((uint32_t *)tdx_test_host_read_private_mem_addr) =3D 0xFEDC; + + tdx_test_success(); +} + +void verify_host_reading_private_mem(void) +{ + uint64_t second_host_read; + uint64_t first_host_read; + struct kvm_vcpu *vcpu; + vm_vaddr_t test_page; + uint64_t *host_virt; + struct kvm_vm *vm; + + vm =3D td_create(); + td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0); + vcpu =3D td_vcpu_add(vm, 0, guest_host_read_priv_mem); + + test_page =3D vm_vaddr_alloc_page(vm); + TEST_ASSERT(test_page < BIT_ULL(32), + "Test address should fit in 32 bits so it can be sent to the guest"); + + host_virt =3D addr_gva2hva(vm, test_page); + TEST_ASSERT(host_virt, + "Guest address not found in guest memory regions\n"); + + tdx_test_host_read_private_mem_addr =3D test_page; + sync_global_to_guest(vm, tdx_test_host_read_private_mem_addr); + + td_finalize(vm); + + printf("Verifying host's behavior when reading TD private memory:\n"); + + tdx_run(vcpu); + tdx_test_assert_io(vcpu, TDX_HOST_READ_PRIVATE_MEM_PORT_TEST, + 4, PORT_WRITE); + printf("\t ... Guest's variable contains 0xABCD\n"); + + /* Host reads guest's variable. */ + first_host_read =3D *host_virt; + printf("\t ... Host's read attempt value: %lu\n", first_host_read); + + /* Guest updates variable and host rereads it. */ + tdx_run(vcpu); + printf("\t ... Guest's variable updated to 0xFEDC\n"); + + second_host_read =3D *host_virt; + printf("\t ... Host's second read attempt value: %lu\n", + second_host_read); + + TEST_ASSERT(first_host_read =3D=3D second_host_read, + "Host did not read a fixed pattern\n"); + + printf("\t ... Fixed pattern was returned to the host\n"); + + kvm_vm_free(vm); + printf("\t ... PASSED\n"); +} + int main(int argc, char **argv) { ksft_print_header(); @@ -966,7 +1045,7 @@ 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(13); + ksft_set_plan(14); 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), @@ -993,6 +1072,8 @@ int main(int argc, char **argv) "verify_mmio_writes\n"); ksft_test_result(!run_in_new_process(&verify_td_cpuid_tdcall), "verify_td_cpuid_tdcall\n"); + ksft_test_result(!run_in_new_process(&verify_host_reading_private_mem), + "verify_host_reading_private_mem\n"); =20 ksft_finished(); return 0; --=20 2.50.0.rc2.692.g299adb8693-goog