From patchwork Wed Sep 21 15:24:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 12983862 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 7C291C6FA82 for ; Wed, 21 Sep 2022 15:29:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231627AbiIUP34 (ORCPT ); Wed, 21 Sep 2022 11:29:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231451AbiIUP3N (ORCPT ); Wed, 21 Sep 2022 11:29:13 -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 ESMTPS id C88039AFA5 for ; Wed, 21 Sep 2022 08:26:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1663773981; 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=pCt4+OvvCMfC3FMJM0ipitrYvDMOF6g7mh1lW2C7mB8=; b=bf8y8y8OACepLkaqCcrp4sbtd5izQyG1zQ/tdRCcVKLE5+wa7gJERwCN4MUcfdQo5bys1e tv0zg4DikpVskYlK9dzIfgnTUzlwRSFn0CF3SVujayty4YmSrmaybA9D0fsKLFRnJbSMc/ UvZvd4Y69mxRqrLsJusiOU2QWakxvy0= 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-140-bvtT7MzyOkykn6FdiwpKWA-1; Wed, 21 Sep 2022 11:26:18 -0400 X-MC-Unique: bvtT7MzyOkykn6FdiwpKWA-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 662A9101AA5B; Wed, 21 Sep 2022 15:26:17 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.194.159]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0C1DF2166B26; Wed, 21 Sep 2022 15:26:14 +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 v10 38/39] KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test Date: Wed, 21 Sep 2022 17:24:35 +0200 Message-Id: <20220921152436.3673454-39-vkuznets@redhat.com> In-Reply-To: <20220921152436.3673454-1-vkuznets@redhat.com> References: <20220921152436.3673454-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: kvm@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/x86_64/hyperv_svm_test.c | 64 +++++++++++++++++-- 1 file changed, 59 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c index a380ad7bb9b3..3bd9e4ceb33f 100644 --- a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c @@ -41,8 +41,13 @@ struct hv_enlightenments { */ #define VMCB_HV_NESTED_ENLIGHTENMENTS (1U << 31) +#define HV_SVM_EXITCODE_ENL 0xF0000000 +#define HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH (1) + void l2_guest_code(void) { + u64 unused; + GUEST_SYNC(3); /* Exit to L1 */ vmmcall(); @@ -56,11 +61,30 @@ void l2_guest_code(void) GUEST_SYNC(5); + /* 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(MSR_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 not issuing Hyper-V TLB flush call again */ + __asm__ __volatile__ ("mov $0xdeadbeef, %rcx"); + /* Done, exit to L1 and never come back. */ vmmcall(); } -static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) +static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm, + struct hyperv_test_pages *hv_pages, + vm_vaddr_t pgs_gpa) { unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; struct vmcb *vmcb = svm->vmcb; @@ -69,13 +93,23 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) GUEST_SYNC(1); - wrmsr(HV_X64_MSR_GUEST_OS_ID, (u64)0x8100 << 48); + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa); + enable_vp_assist(hv_pages->vp_assist_gpa, hv_pages->vp_assist); GUEST_ASSERT(svm->vmcb_gpa); /* Prepare for L2 execution. */ generic_svm_setup(svm, l2_guest_code, &l2_guest_stack[L2_GUEST_STACK_SIZE]); + /* L2 TLB flush setup */ + hve->partition_assist_page = hv_pages->partition_assist_gpa; + hve->hv_enlightenments_control.nested_flush_hypercall = 1; + hve->hv_vm_id = 1; + hve->hv_vp_id = 1; + current_vp_assist->nested_control.features.directhypercall = 1; + *(u32 *)(hv_pages->partition_assist) = 0; + GUEST_SYNC(2); run_guest(vmcb, svm->vmcb_gpa); GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); @@ -110,6 +144,20 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR); vmcb->save.rip += 2; /* rdmsr */ + + /* + * L2 TLB flush test. First VMCALL should be handled directly by L0, + * no VMCALL exit expected. + */ + run_guest(vmcb, svm->vmcb_gpa); + GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR); + vmcb->save.rip += 2; /* rdmsr */ + /* Enable synthetic vmexit */ + *(u32 *)(hv_pages->partition_assist) = 1; + run_guest(vmcb, svm->vmcb_gpa); + GUEST_ASSERT(vmcb->control.exit_code == HV_SVM_EXITCODE_ENL); + GUEST_ASSERT(vmcb->control.exit_info_1 == HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH); + run_guest(vmcb, svm->vmcb_gpa); GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); GUEST_SYNC(6); @@ -119,8 +167,8 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) int main(int argc, char *argv[]) { - vm_vaddr_t nested_gva = 0; - + vm_vaddr_t nested_gva = 0, hv_pages_gva = 0; + vm_vaddr_t hcall_page; struct kvm_vcpu *vcpu; struct kvm_vm *vm; struct kvm_run *run; @@ -134,7 +182,13 @@ int main(int argc, char *argv[]) vcpu_set_hv_cpuid(vcpu); run = vcpu->run; vcpu_alloc_svm(vm, &nested_gva); - vcpu_args_set(vcpu, 1, nested_gva); + vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva); + + hcall_page = vm_vaddr_alloc_pages(vm, 1); + memset(addr_gva2hva(vm, hcall_page), 0x0, getpagesize()); + + vcpu_args_set(vcpu, 3, nested_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page)); + vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id); for (stage = 1;; stage++) { vcpu_run(vcpu);