From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D63CC43334 for ; Thu, 14 Jul 2022 13:53:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240373AbiGNNxX (ORCPT ); Thu, 14 Jul 2022 09:53:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240262AbiGNNwy (ORCPT ); Thu, 14 Jul 2022 09:52:54 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 57AA164E33 for ; Thu, 14 Jul 2022 06:51:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1657806669; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sE7e/SC/8RsVabdcr5o73Rteco1+U9xh/slNEhYUpjs=; b=CquAkBRlhftSpPRQQoaBsGQc+pEVMwl0hWMK/3HkBo921gkel3FOS29oSYzEdMIJmUoVyM sW+nQ+ug/Ja/WlneoORJwYQ6mawHOE2iMDO6GIqe0wK+bYFbRqMbxs4yannTYsnn3ld6V5 Nh2779t3DIM6gLQfLvK1W/AyQXR+JV4= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-446-hCBLK9KHMIe-oWdI382C2g-1; Thu, 14 Jul 2022 09:50:58 -0400 X-MC-Unique: hCBLK9KHMIe-oWdI382C2g-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A7C0018F0260; Thu, 14 Jul 2022 13:50:57 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.194.135]) by smtp.corp.redhat.com (Postfix) with ESMTP id BFE4C2166B2A; Thu, 14 Jul 2022 13:50:55 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , Yuan Yao , Maxim Levitsky , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 36/39] KVM: selftests: evmcs_test: Introduce L2 TLB flush test Date: Thu, 14 Jul 2022 15:49:26 +0200 Message-Id: <20220714134929.1125828-37-vkuznets@redhat.com> In-Reply-To: <20220714134929.1125828-1-vkuznets@redhat.com> References: <20220714134929.1125828-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Enable Hyper-V L2 TLB flush and check that Hyper-V TLB flush hypercalls from L2 don't exit to L1 unless 'TlbLockCount' is set in the Partition assist page. Signed-off-by: Vitaly Kuznetsov --- .../selftests/kvm/include/x86_64/evmcs.h | 2 + .../testing/selftests/kvm/x86_64/evmcs_test.c | 49 ++++++++++++++++++- 2 files changed, 49 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/include/x86_64/evmcs.h b/tools/testing/selftests/kvm/include/x86_64/evmcs.h index 721e119783a5..cf505252e415 100644 --- a/tools/testing/selftests/kvm/include/x86_64/evmcs.h +++ b/tools/testing/selftests/kvm/include/x86_64/evmcs.h @@ -252,6 +252,8 @@ struct hv_enlightened_vmcs { #define HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK \ (~((1ull << HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT) - 1)) +#define HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH 0x10000031 + extern struct hv_enlightened_vmcs *current_evmcs; extern struct hv_vp_assist_page *current_vp_assist; diff --git a/tools/testing/selftests/kvm/x86_64/evmcs_test.c b/tools/testing/selftests/kvm/x86_64/evmcs_test.c index 8dda527cc080..d76f6e054fcc 100644 --- a/tools/testing/selftests/kvm/x86_64/evmcs_test.c +++ b/tools/testing/selftests/kvm/x86_64/evmcs_test.c @@ -16,6 +16,7 @@ #include "kvm_util.h" +#include "hyperv.h" #include "vmx.h" static int ud_count; @@ -48,6 +49,8 @@ static inline void rdmsr_gs_base(void) void l2_guest_code(void) { + u64 unused; + GUEST_SYNC(7); GUEST_SYNC(8); @@ -64,15 +67,32 @@ void l2_guest_code(void) vmcall(); rdmsr_gs_base(); /* intercepted */ + /* L2 TLB flush tests */ + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | HV_FLUSH_ALL_PROCESSORS); + rdmsr_fs_base(); + /* + * Note: hypercall status (RAX) is not preserved correctly by L1 after + * synthetic vmexit, use unchecked version. + */ + __hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | HV_FLUSH_ALL_PROCESSORS, + &unused); + /* Make sure we're no issuing Hyper-V TLB flush call again */ + __asm__ __volatile__ ("mov $0xdeadbeef, %rcx"); + /* Done, exit to L1 and never come back. */ vmcall(); } -void guest_code(struct vmx_pages *vmx_pages) +void guest_code(struct vmx_pages *vmx_pages, vm_vaddr_t pgs_gpa) { #define L2_GUEST_STACK_SIZE 64 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa); + x2apic_enable(); GUEST_SYNC(1); @@ -102,6 +122,14 @@ void guest_code(struct vmx_pages *vmx_pages) vmwrite(PIN_BASED_VM_EXEC_CONTROL, vmreadz(PIN_BASED_VM_EXEC_CONTROL) | PIN_BASED_NMI_EXITING); + /* L2 TLB flush setup */ + current_evmcs->partition_assist_page = vmx_pages->partition_assist_gpa; + current_evmcs->hv_enlightenments_control.nested_flush_hypercall = 1; + current_evmcs->hv_vm_id = 1; + current_evmcs->hv_vp_id = 1; + current_vp_assist->nested_control.features.directhypercall = 1; + *(u32 *)(vmx_pages->partition_assist) = 0; + GUEST_ASSERT(!vmlaunch()); GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa); @@ -146,6 +174,18 @@ void guest_code(struct vmx_pages *vmx_pages) GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ); current_evmcs->guest_rip += 2; /* rdmsr */ + /* + * L2 TLB flush test. First VMCALL should be handled directly by L0, + * no VMCALL exit expected. + */ + GUEST_ASSERT(!vmresume()); + GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ); + current_evmcs->guest_rip += 2; /* rdmsr */ + /* Enable synthetic vmexit */ + *(u32 *)(vmx_pages->partition_assist) = 1; + GUEST_ASSERT(!vmresume()); + GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH); + GUEST_ASSERT(!vmresume()); GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); GUEST_SYNC(11); @@ -199,6 +239,7 @@ static struct kvm_vcpu *save_restore_vm(struct kvm_vm *vm, int main(int argc, char *argv[]) { vm_vaddr_t vmx_pages_gva = 0; + vm_vaddr_t hcall_page; struct kvm_vcpu *vcpu; struct kvm_vm *vm; @@ -212,11 +253,15 @@ int main(int argc, char *argv[]) TEST_REQUIRE(kvm_has_cap(KVM_CAP_NESTED_STATE)); TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)); + hcall_page = vm_vaddr_alloc_pages(vm, 1); + memset(addr_gva2hva(vm, hcall_page), 0x0, getpagesize()); + vcpu_set_hv_cpuid(vcpu); vcpu_enable_evmcs(vcpu); vcpu_alloc_vmx(vm, &vmx_pages_gva); - vcpu_args_set(vcpu, 1, vmx_pages_gva); + vcpu_args_set(vcpu, 2, vmx_pages_gva, addr_gva2gpa(vm, hcall_page)); + vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id); vm_init_descriptor_tables(vm); vcpu_init_descriptor_tables(vcpu); -- 2.35.3