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 X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 044ACC43332 for ; Tue, 2 Mar 2021 22:37:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C179F64F1D for ; Tue, 2 Mar 2021 22:37:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1444882AbhCBWLE (ORCPT ); Tue, 2 Mar 2021 17:11:04 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:21153 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1836007AbhCBTfg (ORCPT ); Tue, 2 Mar 2021 14:35:36 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1614713639; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tn8nxUkOnMTO5dlRCxByClti3TtIcwPTrbSb0/ZLdGo=; b=B3TR6fe3+Y8YJIIwrCXs+0FHlDTLoIQeJ15JiAOzEyVDcSpTw5h2XHJ4+OI3hWC7RSG5SO BHtqpYHm254m6F2rBELQoAeuFD+0QLXT2gnFkdlFjOlUM7GssURmfYCp5byuDyG2mZ5T/m KBbew9v6bNOdhCp3JAPyAnzJcHQcvg4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-157-2QBCVp7zPwe3Y5zC3obmsQ-1; Tue, 02 Mar 2021 14:33:57 -0500 X-MC-Unique: 2QBCVp7zPwe3Y5zC3obmsQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 479DF801977; Tue, 2 Mar 2021 19:33:56 +0000 (UTC) Received: from virtlab511.virt.lab.eng.bos.redhat.com (virtlab511.virt.lab.eng.bos.redhat.com [10.19.152.198]) by smtp.corp.redhat.com (Postfix) with ESMTP id D4D045B4B6; Tue, 2 Mar 2021 19:33:55 +0000 (UTC) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: seanjc@google.com Subject: [PATCH 20/23] KVM: SVM: move VMLOAD/VMSAVE to C code Date: Tue, 2 Mar 2021 14:33:40 -0500 Message-Id: <20210302193343.313318-21-pbonzini@redhat.com> In-Reply-To: <20210302193343.313318-1-pbonzini@redhat.com> References: <20210302193343.313318-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Thanks to the new macros that handle exception handling for SVM instructions, it is easier to just do the VMLOAD/VMSAVE in C. This is safe, as shown by the fact that the host reload is already done outside the assembly source. Signed-off-by: Paolo Bonzini --- arch/x86/kvm/svm/svm.c | 2 ++ arch/x86/kvm/svm/vmenter.S | 14 +------------- 2 files changed, 3 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 1c62d3ec7e53..a0df44f6c239 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3719,7 +3719,9 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu) } else { struct svm_cpu_data *sd = per_cpu(svm_data, vcpu->cpu); + vmload(svm->vmcb_pa); __svm_vcpu_run(svm->vmcb_pa, (unsigned long *)&vcpu->arch.regs); + vmsave(svm->vmcb_pa); vmload(__sme_page_pa(sd->save_area)); } diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S index 6feb8c08f45a..343108bf0f8c 100644 --- a/arch/x86/kvm/svm/vmenter.S +++ b/arch/x86/kvm/svm/vmenter.S @@ -79,12 +79,6 @@ SYM_FUNC_START(__svm_vcpu_run) /* Enter guest mode */ sti -1: vmload %_ASM_AX - jmp 3f -2: cmpb $0, kvm_rebooting - jne 3f - ud2 - _ASM_EXTABLE(1b, 2b) 3: vmrun %_ASM_AX jmp 5f @@ -93,13 +87,7 @@ SYM_FUNC_START(__svm_vcpu_run) ud2 _ASM_EXTABLE(3b, 4b) -5: vmsave %_ASM_AX - jmp 7f -6: cmpb $0, kvm_rebooting - jne 7f - ud2 - _ASM_EXTABLE(5b, 6b) -7: +5: cli #ifdef CONFIG_RETPOLINE -- 2.26.2