From nobody Thu Nov 28 05:28:57 2024 Received: from smtp-fw-80008.amazon.com (smtp-fw-80008.amazon.com [99.78.197.219]) (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 ADDF32141C9; Fri, 4 Oct 2024 14:10:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=99.78.197.219 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728051029; cv=none; b=L67+pnCzYzYdOoVdGRCoo/xAv1fDHMfazUqLv2+xP74ayrBZArNYR9RyoDpEWIYHHdB+RiUQfPyvi57/jkg6ypmHPW61EUyV+EdqN4lN6b+Oqv5kHyRek+7yYjRrgv1OA3U6OoE0el57At689P4ARPN1bkMVw1e+ivOSlF2p3V8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728051029; c=relaxed/simple; bh=qLZ0dHJJR8y5UGNyoPLEZazqvffEldWZGWTPPwohkMQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=tmojR2zKQ9oUxM40INLEhYRmUPkiTQkKNEN3ySC2/bvLQUIax+q9TRf6E9KMDgcS+Nm8G6PQuOuHMoSJvNzm1nzSWeDpsbDSIyQZ3XIg//5tfyz5xNxEnc+Lk+wtLcFj0UKpawpJHcXV58+aLNDVR+6gsx0G9WnDqSpbCFFkUYw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.de; spf=pass smtp.mailfrom=amazon.de; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b=bOkoNvV1; arc=none smtp.client-ip=99.78.197.219 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b="bOkoNvV1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.de; i=@amazon.de; q=dns/txt; s=amazon201209; t=1728051027; x=1759587027; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=qLZ0dHJJR8y5UGNyoPLEZazqvffEldWZGWTPPwohkMQ=; b=bOkoNvV1ItnV6OdH9rE+EHr1daMiVKvCRqXF+YeNNPLHy2XmdwDVEww7 yqdQj5urvEEtIVv2oV4uVwA3FrcjPNSZANGPOPdlX98O/2kDwlWbTNUdI 6h4D6K8jhDYq2Sc1aQa+7QYrZhO/kweAuHTx3cWlpdMhlBEOPdbHUBSrN A=; X-IronPort-AV: E=Sophos;i="6.11,177,1725321600"; d="scan'208";a="135245914" Received: from pdx4-co-svc-p1-lb2-vlan3.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.25.36.214]) by smtp-border-fw-80008.pdx80.corp.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Oct 2024 14:10:25 +0000 Received: from EX19MTAUWB002.ant.amazon.com [10.0.21.151:5490] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.57.100:2525] with esmtp (Farcaster) id cf9536d7-31c7-4604-8950-7576c1ee7d34; Fri, 4 Oct 2024 14:10:25 +0000 (UTC) X-Farcaster-Flow-ID: cf9536d7-31c7-4604-8950-7576c1ee7d34 Received: from EX19D020UWA003.ant.amazon.com (10.13.138.254) by EX19MTAUWB002.ant.amazon.com (10.250.64.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Fri, 4 Oct 2024 14:10:19 +0000 Received: from EX19MTAUWB001.ant.amazon.com (10.250.64.248) by EX19D020UWA003.ant.amazon.com (10.13.138.254) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Fri, 4 Oct 2024 14:10:19 +0000 Received: from email-imr-corp-prod-pdx-all-2b-f5cd2367.us-west-2.amazon.com (10.25.36.214) by mail-relay.amazon.com (10.250.64.254) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34 via Frontend Transport; Fri, 4 Oct 2024 14:10:19 +0000 Received: from dev-dsk-nikwip-1b-bc9ec026.eu-west-1.amazon.com (dev-dsk-nikwip-1b-bc9ec026.eu-west-1.amazon.com [10.253.74.52]) by email-imr-corp-prod-pdx-all-2b-f5cd2367.us-west-2.amazon.com (Postfix) with ESMTPS id 7A34AC0165; Fri, 4 Oct 2024 14:10:16 +0000 (UTC) From: Nikolas Wipper To: Vitaly Kuznetsov CC: Nicolas Saenz Julienne , Alexander Graf , James Gowans , , Sean Christopherson , "Paolo Bonzini" , Thomas Gleixner , "Ingo Molnar" , Borislav Petkov , Dave Hansen , Nikolas Wipper , , , , , , "Nikolas Wipper" Subject: [PATCH 7/7] KVM: selftests: Add tests for KVM_HYPERV_SET_TLB_FLUSH_INHIBIT Date: Fri, 4 Oct 2024 14:08:10 +0000 Message-ID: <20241004140810.34231-8-nikwip@amazon.de> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241004140810.34231-1-nikwip@amazon.de> References: <20241004140810.34231-1-nikwip@amazon.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Add basic test for KVM_HYPERV_SET_TLB_FLUSH_INHIBIT. Since information about the suspension is not communicated to userspace this test checks for suspension by checking whether the thread running a vCPU is still executing. Signed-off-by: Nikolas Wipper --- tools/testing/selftests/kvm/Makefile | 1 + .../kvm/x86_64/hyperv_tlb_flush_inhibit.c | 274 ++++++++++++++++++ 2 files changed, 275 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush_inh= ibit.c diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests= /kvm/Makefile index 45cb70c048bb..098c9c3f9ad8 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -79,6 +79,7 @@ TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_features TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_ipi TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_svm_test TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_tlb_flush +TEST_GEN_PROGS_x86_64 +=3D x86_64/hyperv_tlb_flush_inhibit TEST_GEN_PROGS_x86_64 +=3D x86_64/kvm_clock_test TEST_GEN_PROGS_x86_64 +=3D x86_64/kvm_pv_test TEST_GEN_PROGS_x86_64 +=3D x86_64/monitor_mwait_test diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush_inhibit.c = b/tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush_inhibit.c new file mode 100644 index 000000000000..638ed6ec8ae1 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush_inhibit.c @@ -0,0 +1,274 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test for KVM's emulation of Hyper-V's TlbFlushInhibit bit + * + * Copyright =C2=A9 2024 Amazon.com, Inc. or its affiliates. All Rights Re= served. + */ +#include +#include + +#include "apic.h" +#include "hyperv.h" + +struct timespec abstime; + +struct test_data { + bool entered; + bool hypercall_done; + vm_paddr_t hcall_gpa; +}; + +void guest_main(vm_vaddr_t test_data) +{ + struct test_data *data =3D (struct test_data *)test_data; + + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, data->hcall_gpa); + + WRITE_ONCE(data->entered, true); + + /* Aligned for loading into XMM registers */ + __aligned(16) u64 processor_mask =3D BIT(0) | BIT(1) | BIT(2); + + /* Setup fast hyper-call */ + hyperv_write_xmm_input(&processor_mask, 1); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | + HV_HYPERCALL_FAST_BIT, + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + data->hypercall_done =3D true; + + GUEST_DONE(); +} + +struct test_data *test_data_init(struct kvm_vcpu *vcpu) +{ + vm_vaddr_t test_data_page; + + test_data_page =3D vm_vaddr_alloc_page(vcpu->vm); + + vcpu_args_set(vcpu, 1, test_data_page); + + return (struct test_data *)addr_gva2hva(vcpu->vm, test_data_page); +} + +static void *vcpu_thread(void *arg) +{ + struct kvm_vcpu *vcpu =3D (struct kvm_vcpu *)arg; + struct ucall uc; + + while (1) { + vcpu_run(vcpu); + + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_PRINTF: + REPORT_GUEST_PRINTF(uc); + break; + default: + TEST_ASSERT_EQ(get_ucall(vcpu, &uc), UCALL_DONE); + return NULL; + } + } +} + +/* Test one vCPU being inhibited while another tries to flush its TLB */ +void test_single(struct kvm_vm *vm, struct kvm_vcpu *inhibitor, + struct kvm_vcpu *flusher) +{ + struct kvm_hyperv_tlb_flush_inhibit set; + struct test_data *data; + unsigned int to_sleep; + pthread_t thread; + + printf("%s ...\t", __func__); + + vcpu_arch_set_entry_point(flusher, guest_main); + + data =3D test_data_init(flusher); + + data->entered =3D false; + data->hypercall_done =3D false; + data->hcall_gpa =3D addr_gva2gpa(vm, vm_vaddr_alloc_pages(vm, 1)); + + set.inhibit =3D true; + vcpu_ioctl(inhibitor, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + + pthread_create(&thread, NULL, vcpu_thread, flusher); + + /* Waiting on the guest to fully enter */ + while (READ_ONCE(data->entered) =3D=3D false) + asm volatile ("nop"); + + /* Give the guest some time to attempt the hyper-call */ + to_sleep =3D 2; + while ((to_sleep =3D sleep(to_sleep))) + asm volatile ("nop"); + + TEST_ASSERT_EQ(data->hypercall_done, false); + TEST_ASSERT(pthread_tryjoin_np(thread, NULL) !=3D 0, "thread finished ear= ly"); + + set.inhibit =3D false; + vcpu_ioctl(inhibitor, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + + clock_gettime(CLOCK_REALTIME, &abstime); + abstime.tv_sec +=3D 5; + TEST_ASSERT(pthread_timedjoin_np(thread, NULL, &abstime) =3D=3D 0, + "couldn't join thread"); + + TEST_ASSERT_EQ(data->hypercall_done, true); + + printf("[ok]\n"); +} + +/* Test one vCPU being inhibited while two others try to flush its TLB */ +void test_multi_flusher(struct kvm_vm *vm, struct kvm_vcpu *inhibitor, + struct kvm_vcpu *flusher1, struct kvm_vcpu *flusher2) +{ + struct kvm_hyperv_tlb_flush_inhibit set; + struct test_data *data1, *data2; + pthread_t thread1, thread2; + unsigned int to_sleep; + + printf("%s ...\t", __func__); + + vcpu_arch_set_entry_point(flusher1, guest_main); + vcpu_arch_set_entry_point(flusher2, guest_main); + + data1 =3D test_data_init(flusher1); + data2 =3D test_data_init(flusher2); + + data1->entered =3D false; + data1->hypercall_done =3D false; + data1->hcall_gpa =3D addr_gva2gpa(vm, vm_vaddr_alloc_pages(vm, 1)); + data2->entered =3D false; + data2->hypercall_done =3D false; + data2->hcall_gpa =3D addr_gva2gpa(vm, vm_vaddr_alloc_pages(vm, 1)); + + set.inhibit =3D true; + vcpu_ioctl(inhibitor, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + + pthread_create(&thread1, NULL, vcpu_thread, flusher1); + pthread_create(&thread2, NULL, vcpu_thread, flusher2); + + /* Waiting on the guests to fully enter */ + while (READ_ONCE(data1->entered) =3D=3D false) + asm volatile("nop"); + while (READ_ONCE(data2->entered) =3D=3D false) + asm volatile("nop"); + + /* Give the guests some time to attempt the hyper-call */ + to_sleep =3D 2; + while ((to_sleep =3D sleep(to_sleep))) + asm volatile("nop"); + + TEST_ASSERT_EQ(data1->hypercall_done, false); + TEST_ASSERT_EQ(data2->hypercall_done, false); + + TEST_ASSERT(pthread_tryjoin_np(thread1, NULL) !=3D 0, + "thread 1 finished early"); + TEST_ASSERT(pthread_tryjoin_np(thread2, NULL) !=3D 0, + "thread 2 finished early"); + + set.inhibit =3D false; + vcpu_ioctl(inhibitor, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + + clock_gettime(CLOCK_REALTIME, &abstime); + abstime.tv_sec +=3D 5; + TEST_ASSERT(pthread_timedjoin_np(thread1, NULL, &abstime) =3D=3D 0, + "couldn't join thread1"); + + clock_gettime(CLOCK_REALTIME, &abstime); + abstime.tv_sec +=3D 5; + TEST_ASSERT(pthread_timedjoin_np(thread2, NULL, &abstime) =3D=3D 0, + "couldn't join thread2"); + + TEST_ASSERT_EQ(data1->hypercall_done, true); + TEST_ASSERT_EQ(data2->hypercall_done, true); + + printf("[ok]\n"); +} + +/* Test two vCPUs being inhibited while another tries to flush their TLBs = */ +void test_multi_inhibitor(struct kvm_vm *vm, struct kvm_vcpu *inhibitor1, + struct kvm_vcpu *inhibitor2, struct kvm_vcpu *flusher) +{ + struct kvm_hyperv_tlb_flush_inhibit set; + struct test_data *data; + unsigned int to_sleep; + pthread_t thread; + + printf("%s ...\t", __func__); + + vcpu_arch_set_entry_point(flusher, guest_main); + + data =3D test_data_init(flusher); + + data->entered =3D false; + data->hypercall_done =3D false; + data->hcall_gpa =3D addr_gva2gpa(vm, vm_vaddr_alloc_pages(vm, 1)); + + set.inhibit =3D true; + vcpu_ioctl(inhibitor1, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + vcpu_ioctl(inhibitor2, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + + pthread_create(&thread, NULL, vcpu_thread, flusher); + + /* Waiting on the guest to fully enter */ + while (READ_ONCE(data->entered) =3D=3D false) + asm volatile ("nop"); + + /* Give the guest some time to attempt the hyper-call */ + to_sleep =3D 2; + while ((to_sleep =3D sleep(to_sleep))) + asm volatile ("nop"); + + TEST_ASSERT_EQ(data->hypercall_done, false); + TEST_ASSERT(pthread_tryjoin_np(thread, NULL) !=3D 0, "thread finished ear= ly"); + + set.inhibit =3D false; + vcpu_ioctl(inhibitor1, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + + to_sleep =3D 1; + while ((to_sleep =3D sleep(to_sleep))) + asm volatile ("nop"); + + TEST_ASSERT_EQ(data->hypercall_done, false); + TEST_ASSERT(pthread_tryjoin_np(thread, NULL) !=3D 0, "thread finished ear= ly"); + + set.inhibit =3D false; + vcpu_ioctl(inhibitor2, KVM_HYPERV_SET_TLB_FLUSH_INHIBIT, &set); + + clock_gettime(CLOCK_REALTIME, &abstime); + abstime.tv_sec +=3D 5; + TEST_ASSERT(pthread_timedjoin_np(thread, NULL, &abstime) =3D=3D 0, + "couldn't join thread"); + + TEST_ASSERT_EQ(data->entered, true); + TEST_ASSERT_EQ(data->hypercall_done, true); + + printf("[ok]\n"); +} + +int main(int argc, char *argv[]) +{ + struct kvm_vcpu *vcpu[3]; + struct kvm_vm *vm; + + TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_TLBFLUSH)); + TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_TLB_FLUSH_INHIBIT)); + + vm =3D vm_create_with_vcpus(3, guest_main, vcpu); + + vcpu_set_hv_cpuid(vcpu[0]); + vcpu_set_hv_cpuid(vcpu[1]); + vcpu_set_hv_cpuid(vcpu[2]); + + test_single(vm, vcpu[1], vcpu[0]); + test_multi_flusher(vm, vcpu[1], vcpu[0], vcpu[2]); + test_multi_inhibitor(vm, vcpu[1], vcpu[2], vcpu[0]); + + kvm_vm_free(vm); + + return 0; +} --=20 2.40.1 Amazon Web Services Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597