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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11A89C433F5 for ; Wed, 13 Oct 2021 16:57:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E95416109E for ; Wed, 13 Oct 2021 16:57:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237931AbhJMQ7t (ORCPT ); Wed, 13 Oct 2021 12:59:49 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:21863 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238236AbhJMQ7b (ORCPT ); Wed, 13 Oct 2021 12:59:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634144247; 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=Fyu09GZFGUx4nBOLNYk/fAUDRi0wmwohbIJZu/R+jms=; b=bc9Olvn7SmOibrJLtak3RpBsTZTbQAqNF28dB5JQz2PSBKkGBouGGR6bYgmkzhFDxACoBz LpXlIBDKguySSG63nrEM3hC0y8B2zbKiip/Cf8z/0imTcOrRdXcN5G/M2QYUYbhqnYRTsH Hjr0wlBcGVH/A0eYbHtHa+FIP+JGd+E= 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-2-EYOD87vJPUCv-BKchwdkhA-1; Wed, 13 Oct 2021 12:56:21 -0400 X-MC-Unique: EYOD87vJPUCv-BKchwdkhA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9664F1842154; Wed, 13 Oct 2021 16:56:20 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1929D5DA60; Wed, 13 Oct 2021 16:56:20 +0000 (UTC) From: Paolo Bonzini To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: fwilhelm@google.com, seanjc@google.com, oupton@google.com, stable@vger.kernel.org Subject: [PATCH 5/8] KVM: x86: split the two parts of emulator_pio_in Date: Wed, 13 Oct 2021 12:56:13 -0400 Message-Id: <20211013165616.19846-6-pbonzini@redhat.com> In-Reply-To: <20211013165616.19846-1-pbonzini@redhat.com> References: <20211013165616.19846-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org emulator_pio_in handles both the case where the data is pending in vcpu->arch.pio.count, and the case where I/O has to be done via either an in-kernel device or a userspace exit. For SEV-ES we would like to split these, to identify clearly the moment at which the sev_pio_data is consumed. To this end, create two different functions: __emulator_pio_in fills in vcpu->arch.pio.count, while complete_emulator_pio_in clears it and releases vcpu->arch.pio.data. While at it, remove the void* argument also from emulator_pio_in_out. No functional change intended. Cc: stable@vger.kernel.org Fixes: 7ed9abfe8e9f ("KVM: SVM: Support string IO operations for an SEV-ES guest") Signed-off-by: Paolo Bonzini --- arch/x86/kvm/x86.c | 42 +++++++++++++++++++++++------------------- 1 file changed, 23 insertions(+), 19 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8880dc36a2b4..07d9533b471d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6906,7 +6906,7 @@ static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) } static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, - unsigned short port, void *val, + unsigned short port, unsigned int count, bool in) { vcpu->arch.pio.port = port; @@ -6927,26 +6927,31 @@ static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, return 0; } -static int emulator_pio_in(struct kvm_vcpu *vcpu, int size, - unsigned short port, void *val, unsigned int count) +static int __emulator_pio_in(struct kvm_vcpu *vcpu, int size, + unsigned short port, unsigned int count) { - int ret; - - if (vcpu->arch.pio.count) - goto data_avail; - + WARN_ON(vcpu->arch.pio.count); memset(vcpu->arch.pio_data, 0, size * count); + return emulator_pio_in_out(vcpu, size, port, count, true); +} - ret = emulator_pio_in_out(vcpu, size, port, val, count, true); - if (ret) { -data_avail: - memcpy(val, vcpu->arch.pio_data, size * count); - trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data); - vcpu->arch.pio.count = 0; - return 1; - } +static void complete_emulator_pio_in(struct kvm_vcpu *vcpu, int size, + unsigned short port, void *val) +{ + memcpy(val, vcpu->arch.pio_data, size * vcpu->arch.pio.count); + trace_kvm_pio(KVM_PIO_IN, port, size, vcpu->arch.pio.count, vcpu->arch.pio_data); + vcpu->arch.pio.count = 0; +} - return 0; +static int emulator_pio_in(struct kvm_vcpu *vcpu, int size, + unsigned short port, void *val, unsigned int count) +{ + if (!vcpu->arch.pio.count && !__emulator_pio_in(vcpu, size, port, count)) + return 0; + + WARN_ON(count != vcpu->arch.pio.count); + complete_emulator_pio_in(vcpu, size, port, val); + return 1; } static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt, @@ -6965,12 +6970,11 @@ static int emulator_pio_out(struct kvm_vcpu *vcpu, int size, memcpy(vcpu->arch.pio_data, val, size * count); trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data); - ret = emulator_pio_in_out(vcpu, size, port, (void *)val, count, false); + ret = emulator_pio_in_out(vcpu, size, port, count, false); if (ret) vcpu->arch.pio.count = 0; return ret; - } static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt, -- 2.27.0