From nobody Fri Dec 19 22:02:58 2025 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (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 27D2A1FF7A5 for ; Mon, 14 Apr 2025 21:48:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744667332; cv=none; b=Hdy+UCUuYmfyifx4buMrseHnybos4C9Hf3gge67rEUBeVYYFwKQbVbZdtbU2qG/M9CUJwMCdYB0cMhMv9NLD+GfsiF42BXh0OhcOY2d/j0xF65ESM9c60t9DlRmQNQNDicaUccaheurvixcptYICYIdj/4w0xKyPTk4AT2AuUIA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744667332; c=relaxed/simple; bh=ocxRN7xdwWLtr5hQHt+BZ4mkKFTanjb/oeVK5mDnB68=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=tgRhHVepLmpkAIDWgI1m1kP0prijjRbIMgJTO1Z/ZhWP17mpqEU0bV9Z5BI8IvGzxlJP/ypi/oRfmvOLUYMapiESrZLtqa/4VgJBRsjHV1rEV4tzYb/IqoRP6W525tsyJn6BBSZsISL76PjgX7Qx74ke6Q6J/qA+hV4QpC8nzSs= 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=Kgx0xRY8; arc=none smtp.client-ip=209.85.210.201 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="Kgx0xRY8" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-736c89461d1so6668627b3a.3 for ; Mon, 14 Apr 2025 14:48:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744667330; x=1745272130; 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=HRhTODvisTfaiy4uFCxlPOQM9xPsqUOZrcKfVYCdQmc=; b=Kgx0xRY827sI1nxJaSfiKHrG/nL4NVkiDHxFdNUtWsTVlDQnJgTtzmhegA8xQNegl4 yKfHOVsUs1UinK0jt7ZcTf+UK7j9TrjwdVRQfMRCMqxT/oHD4Tv/Hl6szM5lJNvAntX+ ewGsnEqDlnbvgkpxOcda7XCCnq7lEzi+v7I8MTNz2Nn57TzMdrXGjuxCk7KSt96ivRxd ArZ42N4FdYHJ3JvBDcdlFlUtmnZISeB/vqYRfQUtQEu8ZffoX4sbOTMF+w6YlSW7Yf5D XXzQXG41vfwjqnjbN6krqMAThMkVOgc3TmFXXAUbfQJIA2JAoaiRTdlSzaCMYJHpinbp 5ZSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744667330; x=1745272130; 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=HRhTODvisTfaiy4uFCxlPOQM9xPsqUOZrcKfVYCdQmc=; b=m1C5CWRAN3X0DRVdWdITQ6fBSLz0CilmUtgKwX+kaPvdbTJgLclA/Xk+LNuHYmSGaD egAME00TLMY6Of0mggmD+ju/LJce4vQv5mch4Hb+oLz5qG5lprZBAbOVrqDSySk7R+fT jqkM5+WQ0rIQJ8w6wM90ynczqkXD6xQnfBAufGfAk+DLL8l7KeQkqgf+Ci1/S/2ikJpY YACaBk15uRNCAmuI6l1o6hLSaoxHIgeRWjQEQe+dnbuYycOnnJ5N+nX47B7eZujVPec8 0yo3Erzgg5oYxV6R+fUK0vCtjbKGvPUNJj4LnVzyPPNQgPPd/HudoNF1PRTscCO9Rm6+ HEEQ== X-Gm-Message-State: AOJu0YzpeNTPQwcZIBgvedReJu2ZkJeGQK/QYYeXU2gs0IE5UCFIye+8 cdhz6aC2Q3qjEFs7m534jQ8aVerO3SiJcsaI8upzUgphgWtqNPlLFzy4hP+1m9jQxv2HPU4jRw= = X-Google-Smtp-Source: AGHT+IH2ANqybdgPb08Zf42UrpVzKMTzNDhF/aTJYqnSLdF4VZx5xXyV/A/WViTs4yT1sBwJSAozJW64vw== X-Received: from pfjf20.prod.google.com ([2002:a05:6a00:22d4:b0:739:8c87:ed18]) (user=sagis job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:1907:b0:737:6e1f:29da with SMTP id d2e1a72fcca58-73bd12dc5e6mr18296407b3a.21.1744667330365; Mon, 14 Apr 2025 14:48:50 -0700 (PDT) Date: Mon, 14 Apr 2025 14:47:37 -0700 In-Reply-To: <20250414214801.2693294-1-sagis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250414214801.2693294-1-sagis@google.com> X-Mailer: git-send-email 2.49.0.777.g153de2bbd5-goog Message-ID: <20250414214801.2693294-9-sagis@google.com> Subject: [PATCH v6 08/30] KVM: selftests: TDX: Update load_td_memory_region() for VM memory backed by guest memfd 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: Ackerley Tng If guest memory is backed by restricted memfd + UPM is being used, hence encrypted memory region has to be registered + Can avoid making a copy of guest memory before getting TDX to initialize the memory region Signed-off-by: Ackerley Tng Signed-off-by: Sagi Shahar --- .../selftests/kvm/lib/x86/tdx/tdx_util.c | 38 +++++++++++++++---- 1 file changed, 30 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c b/tools/tes= ting/selftests/kvm/lib/x86/tdx/tdx_util.c index bb074af4a476..e2bf9766dc03 100644 --- a/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx_util.c @@ -324,6 +324,21 @@ static void tdx_td_finalize_mr(struct kvm_vm *vm) tdx_ioctl(vm->fd, KVM_TDX_FINALIZE_VM, 0, NULL); } =20 +/* + * Other ioctls + */ + +/* + * Register a memory region that may contain encrypted data in KVM. + */ +static void register_encrypted_memory_region(struct kvm_vm *vm, + struct userspace_mem_region *region) +{ + vm_set_memory_attributes(vm, region->region.guest_phys_addr, + region->region.memory_size, + KVM_MEMORY_ATTRIBUTE_PRIVATE); +} + /* * TD creation/setup/finalization */ @@ -459,28 +474,35 @@ static void load_td_memory_region(struct kvm_vm *vm, if (!sparsebit_any_set(pages)) return; =20 + if (region->region.guest_memfd !=3D -1) + register_encrypted_memory_region(vm, region); + sparsebit_for_each_set_range(pages, i, j) { const uint64_t size_to_load =3D (j - i + 1) * vm->page_size; const uint64_t offset =3D (i - lowest_page_in_region) * vm->page_size; const uint64_t hva =3D hva_base + offset; const uint64_t gpa =3D gpa_base + offset; - void *source_addr; + void *source_addr =3D (void *)hva; =20 /* * KVM_TDX_INIT_MEM_REGION ioctl cannot encrypt memory in place. * Make a copy if there's only one backing memory source. */ - source_addr =3D mmap(NULL, size_to_load, PROT_READ | PROT_WRITE, - MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); - TEST_ASSERT(source_addr, - "Could not allocate memory for loading memory region"); - - memcpy(source_addr, (void *)hva, size_to_load); + if (region->region.guest_memfd =3D=3D -1) { + source_addr =3D mmap(NULL, size_to_load, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + TEST_ASSERT(source_addr, + "Could not allocate memory for loading memory region"); + + memcpy(source_addr, (void *)hva, size_to_load); + memset((void *)hva, 0, size_to_load); + } =20 tdx_init_mem_region(vm, source_addr, gpa, size_to_load); =20 - munmap(source_addr, size_to_load); + if (region->region.guest_memfd =3D=3D -1) + munmap(source_addr, size_to_load); } } =20 --=20 2.49.0.504.g3bcea36a83-goog