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Fri, 21 Feb 2025 16:10:40 +0000 Received: from EX19MTAUWC002.ant.amazon.com (10.250.64.143) by EX19D003UWB004.ant.amazon.com (10.13.138.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1544.14; Fri, 21 Feb 2025 16:10:39 +0000 Received: from email-imr-corp-prod-pdx-all-2b-c1559d0e.us-west-2.amazon.com (10.25.36.210) by mail-relay.amazon.com (10.250.64.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.39 via Frontend Transport; Fri, 21 Feb 2025 16:10:39 +0000 Received: from ua2d7e1a6107c5b.ant.amazon.com (dev-dsk-roypat-1c-dbe2a224.eu-west-1.amazon.com [172.19.88.180]) by email-imr-corp-prod-pdx-all-2b-c1559d0e.us-west-2.amazon.com (Postfix) with ESMTPS id B70BB404C9; Fri, 21 Feb 2025 16:10:32 +0000 (UTC) From: Patrick Roy To: , , CC: Patrick Roy , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v4 12/12] KVM: selftests: Test guest execution from direct map removed gmem Date: Fri, 21 Feb 2025 16:07:25 +0000 Message-ID: <20250221160728.1584559-13-roypat@amazon.co.uk> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250221160728.1584559-1-roypat@amazon.co.uk> References: <20250221160728.1584559-1-roypat@amazon.co.uk> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 017D010000A X-Stat-Signature: ni775qeannwgjb9w11nem6newnpq8x7h X-Rspamd-Server: rspam03 X-HE-Tag: 1740154243-172100 X-HE-Meta: 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 Oz1xRUSg oCsIBJqCqvNEhR2tA5V3RtnSK0OYWLUnYOYd16NncmNvfljyQAsaJ8kfqIplglmxL7qtHg2UWJaPaSz0W3N1Se/FkiAxvUEBYofYBNxU/3d671WZOrxagRTTTymQuBNbBh9mKScvbsr5coIoYiO//lSAwdz+fWXmp2BMaLUl4Bt41x1QC7JoZBgeJ0FNpIiFGU/outw1GYpqsMPif5fMDLbGQ7+QaXQeOU7yWi3RhkvRYEEXOOg3YcHH+7XqWDWKohF0Ht+uNdjkrLyRikFLaAhOUpmaJgftbjcgzGem9FrVtKzV1lZlv1DodnHXO25hqaCbMuTU1f/Hl7rmMUodwChg0zFHD7WKJvd351juQ//A8x6c/INj4/2Cx9m4CjBsl8HEnZ+mlENAzYD8B06NmmwRJEaZZs+RL6oD87VO88E9+vOSRBKPncHYm0XT6Zl0wkexJZVh9Aeqwgidz54kI/tTCZg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a selftest that loads itself into guest_memfd (via KVM_GMEM_SHARED_MEM) and triggers an MMIO exit when executed. This exercises x86 MMIO emulation code inside KVM for guest_memfd-backed memslots where the guest_memfd folios are direct map removed. Particularly, it validates that x86 MMIO emulation code (guest page table walks + instruction fetch) correctly accesses gmem through the VMA that's been reflected into the memslot's userspace_addr field (instead of trying to do direct map accesses). Signed-off-by: Patrick Roy --- .../selftests/kvm/set_memory_region_test.c | 40 +++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/tools/testing/selftests/kvm/set_memory_region_test.c b/tools/testing/selftests/kvm/set_memory_region_test.c index bc440d5aba57..16bbfe117a17 100644 --- a/tools/testing/selftests/kvm/set_memory_region_test.c +++ b/tools/testing/selftests/kvm/set_memory_region_test.c @@ -603,6 +603,42 @@ static void test_mmio_during_vectoring(void) kvm_vm_free(vm); } + +static void guest_code_trigger_mmio(void) +{ + /* + * Read some GPA that is not backed by a memslot. KVM consider this + * as MMIO and tell userspace to emulate the read. + */ + READ_ONCE(*((uint64_t *)MEM_REGION_GPA)); + + GUEST_DONE(); +} + +static void test_guest_memfd_mmio(void) +{ + struct kvm_vm *vm; + struct kvm_vcpu *vcpu; + struct vm_shape shape = { + .mode = VM_MODE_DEFAULT, + .type = KVM_X86_SW_PROTECTED_VM, + .src_type = VM_MEM_SRC_GUEST_MEMFD_NO_DIRECT_MAP, + }; + pthread_t vcpu_thread; + + pr_info("Testing MMIO emulation for instructions in gmem\n"); + + vm = __vm_create_shape_with_one_vcpu(shape, &vcpu, 0, guest_code_trigger_mmio); + + virt_map(vm, MEM_REGION_GPA, MEM_REGION_GPA, 1); + + pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu); + + /* If the MMIO read was successfully emulated, the vcpu thread will exit */ + pthread_join(vcpu_thread, NULL); + + kvm_vm_free(vm); +} #endif int main(int argc, char *argv[]) @@ -630,6 +666,10 @@ int main(int argc, char *argv[]) (kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SW_PROTECTED_VM))) { test_add_private_memory_region(); test_add_overlapping_private_memory_regions(); + if (kvm_has_cap(KVM_CAP_GMEM_SHARED_MEM) && kvm_has_cap(KVM_CAP_GMEM_NO_DIRECT_MAP)) + test_guest_memfd_mmio(); + else + pr_info("Skipping tests requiring KVM_CAP_GMEM_SHARED_MEM | KVM_CAP_GMEM_NO_DIRECT_MAP"); } else { pr_info("Skipping tests for KVM_MEM_GUEST_MEMFD memory regions\n"); }