From patchwork Tue Nov 1 14:54:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 13027092 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 527A4C433FE for ; Tue, 1 Nov 2022 15:08:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231200AbiKAPIG (ORCPT ); Tue, 1 Nov 2022 11:08:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231419AbiKAPHr (ORCPT ); Tue, 1 Nov 2022 11:07:47 -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 C8602220D5 for ; Tue, 1 Nov 2022 08:00:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1667314812; 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=LhhcrvG+7RwHzHHKMtMlqTTJoFvq/28FWWa9Z7l4uf8=; b=T/nSHSiW/9J27GRLOQRMhIG9j9ncAwg+PZ1bVx2VFhm+NV27VawwVKJbGYtS74P/eG62Ck CTk02x/MUA6xHyJbvH9ashe5AOvlBMV5Su6bGtSD/6Q5aUpMZ1Js9M04ie+dK9mDAjvdfO Dcz3uzm7MsQroq7VFuiKBX3zdpSM8tM= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-483-eyrpg5fiP2uappcwww7VVQ-1; Tue, 01 Nov 2022 10:56:56 -0400 X-MC-Unique: eyrpg5fiP2uappcwww7VVQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9930D1C0BC62; Tue, 1 Nov 2022 14:56:55 +0000 (UTC) Received: from ovpn-194-149.brq.redhat.com (ovpn-194-149.brq.redhat.com [10.40.194.149]) by smtp.corp.redhat.com (Postfix) with ESMTP id A36F7C2C8D8; Tue, 1 Nov 2022 14:56:53 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini , Sean Christopherson Cc: Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , Yuan Yao , Maxim Levitsky , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v13 45/48] KVM: selftests: Introduce rdmsr_from_l2() and use it for MSR-Bitmap tests Date: Tue, 1 Nov 2022 15:54:23 +0100 Message-Id: <20221101145426.251680-46-vkuznets@redhat.com> In-Reply-To: <20221101145426.251680-1-vkuznets@redhat.com> References: <20221101145426.251680-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hyper-V MSR-Bitmap tests do RDMSR from L2 to exit to L1. While 'evmcs_test' correctly clobbers all GPRs (which are not preserved), 'hyperv_svm_test' does not. Introduce and use common rdmsr_from_l2() to avoid code duplication and remove hardcoding of MSRs. Signed-off-by: Vitaly Kuznetsov --- .../selftests/kvm/include/x86_64/processor.h | 9 +++++++ .../testing/selftests/kvm/x86_64/evmcs_test.c | 24 ++++--------------- .../selftests/kvm/x86_64/hyperv_svm_test.c | 8 +++---- 3 files changed, 17 insertions(+), 24 deletions(-) diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index fbaf0b6cec4b..a14b7e4ea7c4 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -520,6 +520,15 @@ static inline void cpu_relax(void) "hlt\n" \ ) +/* Exit to L1 from L2 with RDMSR instruction */ +static inline void rdmsr_from_l2(uint32_t msr) +{ + /* Currently, L1 doesn't preserve GPRs during vmexits. */ + __asm__ __volatile__ ("rdmsr" : : "c"(msr) : + "rax", "rbx", "rdx", "rsi", "rdi", "r8", "r9", + "r10", "r11", "r12", "r13", "r14", "r15"); +} + bool is_intel_cpu(void); bool is_amd_cpu(void); diff --git a/tools/testing/selftests/kvm/x86_64/evmcs_test.c b/tools/testing/selftests/kvm/x86_64/evmcs_test.c index 74f076ba574b..a9f511c192c2 100644 --- a/tools/testing/selftests/kvm/x86_64/evmcs_test.c +++ b/tools/testing/selftests/kvm/x86_64/evmcs_test.c @@ -30,22 +30,6 @@ static void guest_nmi_handler(struct ex_regs *regs) { } -/* Exits to L1 destroy GRPs! */ -static inline void rdmsr_fs_base(void) -{ - __asm__ __volatile__ ("mov $0xc0000100, %%rcx; rdmsr" : : : - "rax", "rbx", "rcx", "rdx", - "rsi", "rdi", "r8", "r9", "r10", "r11", "r12", - "r13", "r14", "r15"); -} -static inline void rdmsr_gs_base(void) -{ - __asm__ __volatile__ ("mov $0xc0000101, %%rcx; rdmsr" : : : - "rax", "rbx", "rcx", "rdx", - "rsi", "rdi", "r8", "r9", "r10", "r11", "r12", - "r13", "r14", "r15"); -} - void l2_guest_code(void) { GUEST_SYNC(7); @@ -58,11 +42,11 @@ void l2_guest_code(void) vmcall(); /* MSR-Bitmap tests */ - rdmsr_fs_base(); /* intercepted */ - rdmsr_fs_base(); /* intercepted */ - rdmsr_gs_base(); /* not intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* not intercepted */ vmcall(); - rdmsr_gs_base(); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* intercepted */ /* Done, exit to L1 and never come back. */ vmcall(); 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 1c3fc38b4f15..e30419766c8a 100644 --- a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c @@ -30,11 +30,11 @@ void l2_guest_code(void) vmmcall(); /* MSR-Bitmap tests */ - rdmsr(MSR_FS_BASE); /* intercepted */ - rdmsr(MSR_FS_BASE); /* intercepted */ - rdmsr(MSR_GS_BASE); /* not intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* not intercepted */ vmmcall(); - rdmsr(MSR_GS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* intercepted */ GUEST_SYNC(5);