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Suggested-by: Sean Christopherson Signed-off-by: Manali Shukla --- .../selftests/kvm/include/x86_64/processor.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index 20c9e3b33b07..6de37f6b8ddc 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -1217,6 +1217,23 @@ static inline void kvm_hypercall_map_gpa_range(uint64_t gpa, uint64_t size, GUEST_ASSERT(!ret); } +/* + * Execute HLT in an STI interrupt shadow to ensure that a pending IRQ that's + * intended to be a wake event arrives *after* HLT is executed. Modern CPUs, + * except for a few oddballs that KVM is unlikely to run on, block IRQs for one + * instruction after STI, *if* RFLAGS.IF=0 before STI. Note, Intel CPUs may + * block other events beyond regular IRQs, e.g. may block NMIs and SMIs too. + */ +static inline void safe_halt(void) +{ + asm volatile("sti; hlt"); +} + +static inline void cli(void) +{ + asm volatile ("cli"); +} + void __vm_xsave_require_permission(uint64_t xfeature, const char *name); #define vm_xsave_require_permission(xfeature) \ From patchwork Mon Apr 1 15:20:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manali Shukla X-Patchwork-Id: 13612831 Received: from NAM04-BN8-obe.outbound.protection.outlook.com (mail-bn8nam04on2045.outbound.protection.outlook.com [40.107.100.45]) (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 1ADC445974; Mon, 1 Apr 2024 15:20:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.100.45 ARC-Seal: i=2; a=rsa-sha256; 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Mon, 1 Apr 2024 15:20:51 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ5PEPF000001C9.mail.protection.outlook.com (10.167.242.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7452.22 via Frontend Transport; Mon, 1 Apr 2024 15:20:50 +0000 Received: from chalupa-4a00host.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 1 Apr 2024 10:20:47 -0500 From: Manali Shukla To: , CC: , , , , , , Subject: [PATCH v2 2/3] KVM: selftests: Extend @shape to allow creation of VM without in-kernel APIC Date: Mon, 1 Apr 2024 15:20:31 +0000 Message-ID: <20240401152032.4284-3-manali.shukla@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240401152032.4284-1-manali.shukla@amd.com> References: <20240401152032.4284-1-manali.shukla@amd.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001C9:EE_|PH7PR12MB7938:EE_ X-MS-Office365-Filtering-Correlation-Id: 29c8a016-6d2a-4737-b2e2-08dc525f50cc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Apr 2024 15:20:50.9324 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 29c8a016-6d2a-4737-b2e2-08dc525f50cc X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001C9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7938 Currently, all the VMs are created with in-kernel APIC support in KVM selftests because KVM_CREATE_IRQCHIP ioctl is called by default from kvm_arch_vm_post_create(). Carve out space in the @shape passed to the various VM creation helpers to allow using the shape to control creation of a VM without in-kernel APIC support or with in-kernel APIC support. This is a preparatory patch to create a vm without in-kernel APIC support for the KVM_X86_DISABLE_EXITS_HLT test. Suggested-by: Andrew Jones Signed-off-by: Manali Shukla --- .../selftests/kvm/include/kvm_util_base.h | 17 ++++++++++++++++- tools/testing/selftests/kvm/lib/kvm_util.c | 1 + .../selftests/kvm/lib/x86_64/processor.c | 4 +++- 3 files changed, 20 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index 4a40b332115d..c94cfbdf0150 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -130,6 +130,7 @@ struct kvm_vm { * memslot. */ uint32_t memslots[NR_MEM_REGIONS]; + uint8_t flags; }; struct vcpu_reg_sublist { @@ -197,11 +198,14 @@ enum vm_guest_mode { NUM_VM_MODES, }; +#define NO_IRQCHIP 0x01 + struct vm_shape { uint32_t type; uint8_t mode; uint8_t subtype; - uint16_t padding; + uint8_t flags; + uint8_t padding; }; kvm_static_assert(sizeof(struct vm_shape) == sizeof(uint64_t)); @@ -218,6 +222,17 @@ kvm_static_assert(sizeof(struct vm_shape) == sizeof(uint64_t)); shape; \ }) +#define VM_SHAPE_FLAGS(__FLAGS) \ +({ \ + struct vm_shape shape = { \ + .mode = VM_MODE_DEFAULT, \ + .type = VM_TYPE_DEFAULT, \ + .flags = __FLAGS \ + }; \ + \ + shape; \ +}) + #if defined(__aarch64__) extern enum vm_guest_mode vm_mode_default; diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index adc51b0712ca..86546f603959 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -226,6 +226,7 @@ struct kvm_vm *____vm_create(struct vm_shape shape) vm->mode = shape.mode; vm->type = shape.type; vm->subtype = shape.subtype; + vm->flags = shape.flags; vm->pa_bits = vm_guest_mode_params[vm->mode].pa_bits; vm->va_bits = vm_guest_mode_params[vm->mode].va_bits; diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index 49288fe10cd3..e5ca92feae67 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -574,7 +574,9 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu) void kvm_arch_vm_post_create(struct kvm_vm *vm) { - vm_create_irqchip(vm); 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Mon, 1 Apr 2024 15:20:51 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ5PEPF000001C9.mail.protection.outlook.com (10.167.242.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7452.22 via Frontend Transport; Mon, 1 Apr 2024 15:20:51 +0000 Received: from chalupa-4a00host.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 1 Apr 2024 10:20:48 -0500 From: Manali Shukla To: , CC: , , , , , , Subject: [PATCH v2 3/3] KVM: selftests: Add a test case for KVM_X86_DISABLE_EXITS_HLT Date: Mon, 1 Apr 2024 15:20:32 +0000 Message-ID: <20240401152032.4284-4-manali.shukla@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240401152032.4284-1-manali.shukla@amd.com> References: <20240401152032.4284-1-manali.shukla@amd.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001C9:EE_|PH0PR12MB5679:EE_ X-MS-Office365-Filtering-Correlation-Id: 77800e54-0342-40e5-608e-08dc525f511b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Apr 2024 15:20:51.4481 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 77800e54-0342-40e5-608e-08dc525f511b X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001C9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB5679 By default, HLT instruction executed by guest is intercepted by hypervisor. However, KVM_CAP_X86_DISABLE_EXITS capability can be used to not intercept HLT by setting KVM_X86_DISABLE_EXITS_HLT. Add a test case to test KVM_X86_DISABLE_EXITS_HLT functionality. Suggested-by: Sean Christopherson Signed-off-by: Manali Shukla --- tools/testing/selftests/kvm/Makefile | 1 + .../kvm/x86_64/halt_disable_exit_test.c | 119 ++++++++++++++++++ 2 files changed, 120 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index c75251d5c97c..9f72abb95d2e 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -89,6 +89,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/set_sregs_test TEST_GEN_PROGS_x86_64 += x86_64/smaller_maxphyaddr_emulation_test TEST_GEN_PROGS_x86_64 += x86_64/smm_test TEST_GEN_PROGS_x86_64 += x86_64/state_test +TEST_GEN_PROGS_x86_64 += x86_64/halt_disable_exit_test TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test diff --git a/tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c b/tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c new file mode 100644 index 000000000000..4cc6a09906a2 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * KVM disable halt exit test + * + * Copyright (C) 2024 Advanced Micro Devices, Inc. + */ +#include +#include +#include "kvm_util.h" +#include "processor.h" +#include "test_util.h" + +#define SIG_IPI SIGUSR1 +static pthread_t task_thread, vcpu_thread; + +static void guest_code(uint64_t *is_hlt_exec) +{ + while (!READ_ONCE(*is_hlt_exec)) + ; + + safe_halt(); + GUEST_DONE(); +} + +static void *task_worker(void *arg) +{ + uint64_t *is_hlt_exec = (uint64_t *)arg; + + usleep(100000); + WRITE_ONCE(*is_hlt_exec, 1); + pthread_kill(vcpu_thread, SIG_IPI); + return 0; +} + +static void *vcpu_worker(void *arg) +{ + int ret; + int sig = -1; + struct kvm_vcpu *vcpu = (struct kvm_vcpu *) arg; + struct kvm_run *run; + + struct kvm_signal_mask *sigmask = alloca(offsetof(struct kvm_signal_mask, sigset) + + sizeof(sigset_t)); + sigset_t *sigset = (sigset_t *) &sigmask->sigset; + + /* + * SIG_IPI is unblocked atomically while in KVM_RUN. It causes the + * ioctl to return with -EINTR, but it is still pending and we need + * to accept it with the sigwait. + */ + sigmask->len = 8; + pthread_sigmask(0, NULL, sigset); + sigdelset(sigset, SIG_IPI); + vcpu_ioctl(vcpu, KVM_SET_SIGNAL_MASK, sigmask); + sigemptyset(sigset); + sigaddset(sigset, SIG_IPI); + run = vcpu->run; + +again: + ret = __vcpu_run(vcpu); + TEST_ASSERT_EQ(errno, EINTR); + + if (ret == -1 && errno == EINTR) { + sigwait(sigset, &sig); + assert(sig == SIG_IPI); + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_INTR); + goto again; + } + + if (run->exit_reason == KVM_EXIT_HLT) + TEST_FAIL("Expected KVM_EXIT_INTR, got KVM_EXIT_HLT"); + + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); + return 0; +} + +int main(int argc, char *argv[]) +{ + vm_vaddr_t hlt_vm_addr; + + struct kvm_vm *vm; + struct kvm_vcpu *vcpu; + uint64_t *host_hlt_addr; + void *retval; + sigset_t sigset; + int ret; + + TEST_REQUIRE(kvm_has_cap(KVM_CAP_X86_DISABLE_EXITS)); + + /* Create a VM without in kernel APIC support */ + vm = __vm_create(VM_SHAPE_FLAGS(NO_IRQCHIP), 1, 0); + vm_enable_cap(vm, KVM_CAP_X86_DISABLE_EXITS, KVM_X86_DISABLE_EXITS_HLT); + vcpu = vm_vcpu_add(vm, 0, guest_code); + + + hlt_vm_addr = vm_vaddr_alloc_page(vm); + host_hlt_addr = (uint64_t *)addr_gva2hva(vm, hlt_vm_addr); + vcpu_args_set(vcpu, 1, hlt_vm_addr); + + /* Ensure that vCPU threads start with SIG_IPI blocked. */ + sigemptyset(&sigset); + sigaddset(&sigset, SIG_IPI); + pthread_sigmask(SIG_BLOCK, &sigset, NULL); + + ret = pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu); + TEST_ASSERT(ret == 0, "pthread_create vcpu thread failed errno=%d", errno); + + ret = pthread_create(&task_thread, NULL, task_worker, host_hlt_addr); + TEST_ASSERT(ret == 0, "pthread_create task thread failed errno=%d", errno); + + ret = pthread_join(vcpu_thread, &retval); + TEST_ASSERT(ret == 0, "pthread_join on vcpu thread failed with errno=%d", ret); + + ret = pthread_join(task_thread, &retval); + TEST_ASSERT(ret == 0, "pthread_join on task thread failed with errno=%d", ret); + + kvm_vm_free(vm); + return 0; +}