From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B50764C77A9; Thu, 7 May 2026 20:22:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778185373; cv=none; b=PuqsZ5wGenLwZ1UVeJFhyqRnDKNDRqmHFpErvjr1Z101toSN3VEXiivOn43VtfJecZ9TTpD1Qr39Pi2DLKB4WXbTRgkoUjabzOn0TGcP0WuEyCD8lZKw5RhSgvw6v9mFOqu1k4dbUQzubpvG5i/oWkQeYRqIx9GRrsjUoE4qO44= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778185373; c=relaxed/simple; bh=YsF8COWix+6Yxb8XQMDjxkfCqLW4zILwB+rmik6M5mQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=hWdWehf0X/hW/0pzaoxriyF71oRyBcMtO8s+2GJW0qOSuAfJcZ87AnU2Pt8IIW7uR7a1B8W9e3N9KYOIoa2sjFpiCPCowRb4WgkjWGUipEUkH3E1I8g6HulILwvv12E59sWVg++ym5uZ/uXrZSORk3xyJgvNffdlJXGWdvDOsC8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XQ0fVhTD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XQ0fVhTD" Received: by smtp.kernel.org (Postfix) with ESMTPS id 94EEBC2BCF5; Thu, 7 May 2026 20:22:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778185373; bh=YsF8COWix+6Yxb8XQMDjxkfCqLW4zILwB+rmik6M5mQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=XQ0fVhTDhJP6SPeSC4SMnPAACq1rJ+oht5+P74v03LqecI7lrnv0WGsLBrhHbJqlv Ll4yiSxTGAP3oFJwEwkdvrFr39szvMAu39mOyhBE0MJ3DGMnNCZn+ubaIZ6Qrr6HtO gho6fLSvZBgHa6+aadC1+c4g6QvcTA4cSnGedwixWa5G3wptq6ReVY5mgich+HYd0c OmGxPlVRcVgZl9+q2EzxyezbuHWGtDD+V9i2oCnG7A5/YZQctd8Bt0ofoAL6nINofm iJe0D52FSoUiU5/ef1lsj9YmIjm/2JtywOEyVOfAsIAvFRs2hwPpiFa/PFAKHxseCj OjIWzW0G2PSUw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8702FCD343F; Thu, 7 May 2026 20:22:53 +0000 (UTC) From: Ackerley Tng via B4 Relay Date: Thu, 07 May 2026 13:23:02 -0700 Subject: [PATCH v6 43/43] KVM: selftests: Update private memory exits test to work with per-gmem attributes Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260507-gmem-inplace-conversion-v6-43-91ab5a8b19a4@google.com> References: <20260507-gmem-inplace-conversion-v6-0-91ab5a8b19a4@google.com> In-Reply-To: <20260507-gmem-inplace-conversion-v6-0-91ab5a8b19a4@google.com> To: aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, david@kernel.org, ira.weiny@intel.com, jmattson@google.com, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, tabba@google.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, liam@infradead.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Jason Gunthorpe , Vlastimil Babka Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, Ackerley Tng X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1778185365; l=3772; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=ilZNigktr30OWW+44f6wWT3BpvfT+Tlf9WIw7xVQWhA=; b=RQQ4ZC6yPw+UZAXfzoD0aKRDxzFge3XopvPgK6qmJWMHQatSwRktfz4EuYp2f+79LWhBgyK0g Fz0LXdKV1VPD5JTPG0+IaBIN6RgGKSBh9m0iv9m1sl3WAOpntYe9Zwh X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Endpoint-Received: by B4 Relay for ackerleytng@google.com/20260225 with auth_id=649 X-Original-From: Ackerley Tng Reply-To: ackerleytng@google.com From: Sean Christopherson Skip setting memory to private in the private memory exits test when using per-gmem memory attributes, as memory is initialized to private by default for guest_memfd, and using vm_mem_set_private() on a guest_memfd instance requires creating guest_memfd with GUEST_MEMFD_FLAG_MMAP (which is totally doable, but would need to be conditional and is ultimately unnecessary). Expect an emulated MMIO instead of a memory fault exit when attributes are per-gmem, as deleting the memslot effectively drops the private status, i.e. the GPA becomes shared and thus supports emulated MMIO. Skip the "memslot not private" test entirely, as private vs. shared state for x86 software-protected VMs comes from the memory attributes themselves, and so when doing in-place conversions there can never be a disconnect between the expected and actual states. Signed-off-by: Sean Christopherson Signed-off-by: Ackerley Tng --- .../selftests/kvm/x86/private_mem_kvm_exits_test.c | 36 ++++++++++++++++++---- 1 file changed, 30 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/kvm/x86/private_mem_kvm_exits_test.c b/tools/testing/selftests/kvm/x86/private_mem_kvm_exits_test.c index 10db9fe6d9063..70ed16066c63e 100644 --- a/tools/testing/selftests/kvm/x86/private_mem_kvm_exits_test.c +++ b/tools/testing/selftests/kvm/x86/private_mem_kvm_exits_test.c @@ -62,8 +62,9 @@ static void test_private_access_memslot_deleted(void) virt_map(vm, EXITS_TEST_GVA, EXITS_TEST_GPA, EXITS_TEST_NPAGES); - /* Request to access page privately */ - vm_mem_set_private(vm, EXITS_TEST_GPA, EXITS_TEST_SIZE); + /* Request to access page privately. */ + if (!kvm_has_gmem_attributes) + vm_mem_set_private(vm, EXITS_TEST_GPA, EXITS_TEST_SIZE); pthread_create(&vm_thread, NULL, (void *(*)(void *))run_vcpu_get_exit_reason, @@ -74,10 +75,26 @@ static void test_private_access_memslot_deleted(void) pthread_join(vm_thread, &thread_return); exit_reason = (u32)(u64)thread_return; - TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT); - TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE); - TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA); - TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE); + /* + * If attributes are tracked per-gmem, deleting the memslot that points + * at the gmem instance effectively makes the memory shared, and so the + * read should trigger emulated MMIO. + * + * If attributes are tracked per-VM, deleting the memslot shouldn't + * affect the private attribute, and so KVM should generate a memory + * fault exit (emulated MMIO on private GPAs is disallowed). + */ + if (kvm_has_gmem_attributes) { + TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MMIO); + TEST_ASSERT_EQ(vcpu->run->mmio.phys_addr, EXITS_TEST_GPA); + TEST_ASSERT_EQ(vcpu->run->mmio.len, sizeof(u64)); + TEST_ASSERT_EQ(vcpu->run->mmio.is_write, false); + } else { + TEST_ASSERT_EQ(exit_reason, KVM_EXIT_MEMORY_FAULT); + TEST_ASSERT_EQ(vcpu->run->memory_fault.flags, KVM_MEMORY_EXIT_FLAG_PRIVATE); + TEST_ASSERT_EQ(vcpu->run->memory_fault.gpa, EXITS_TEST_GPA); + TEST_ASSERT_EQ(vcpu->run->memory_fault.size, EXITS_TEST_SIZE); + } kvm_vm_free(vm); } @@ -88,6 +105,13 @@ static void test_private_access_memslot_not_private(void) struct kvm_vcpu *vcpu; u32 exit_reason; + /* + * Accessing non-private memory as private with a software-protected VM + * isn't possible when doing in-place conversions. + */ + if (kvm_has_gmem_attributes) + return; + vm = vm_create_shape_with_one_vcpu(protected_vm_shape, &vcpu, guest_repeatedly_read); -- 2.54.0.563.g4f69b47b94-goog