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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 3DAA4C4360F for ; Mon, 18 Feb 2019 14:02:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0D6FA2070D for ; Mon, 18 Feb 2019 14:02:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498542; bh=63lu6OHPJYHbiZTufuNVG8mDeyuk8eUtb7a+1FFrdOs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=S1bxY+2NkdcRxwvRF8Z9l3LgBkyh2/+m4Q6AFzxUkFjKdBencyXp3GIXAoIIx7GRg g9g8A0pbNvjwW1nEc+ApAHGZbDLhL/NVXxpoSznZ6evHJZ6rsKMVQyKRDRVpxJNmXF +2GNzrkUA95EfMkuaIMK8lQc8StvFto3y6RIrRbQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387643AbfBROCU (ORCPT ); Mon, 18 Feb 2019 09:02:20 -0500 Received: from mail.kernel.org ([198.145.29.99]:43904 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388374AbfBROCS (ORCPT ); Mon, 18 Feb 2019 09:02:18 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 90C2A2070D; Mon, 18 Feb 2019 14:02:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498538; bh=63lu6OHPJYHbiZTufuNVG8mDeyuk8eUtb7a+1FFrdOs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ToTvbtcNPLaADk7NgoRnyb00//4eyuMh3zbao7a/Fp3N19sbYwqGtsq6iXSB3wlpm SdUbH8/0HGKjmexzT3tov2KfJrtsBuX/80FYH6gEmYbUz71YoGh9sPJ8bROLjN0HTf F+fiC9pK5dY7DAVfTGOhbgCqSGZK5CcvZlmL69lg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peter Maydell , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Christoffer Dall , Mark Rutland , Marc Zyngier , Sasha Levin Subject: [PATCH 4.4 040/143] arm64: KVM: Skip MMIO insn after emulation Date: Mon, 18 Feb 2019 14:42:48 +0100 Message-Id: <20190218133530.614487420@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218133529.099444112@linuxfoundation.org> References: <20190218133529.099444112@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 0d640732dbebed0f10f18526de21652931f0b2f2 ] When we emulate an MMIO instruction, we advance the CPU state within decode_hsr(), before emulating the instruction effects. Having this logic in decode_hsr() is opaque, and advancing the state before emulation is problematic. It gets in the way of applying consistent single-step logic, and it prevents us from being able to fail an MMIO instruction with a synchronous exception. Clean this up by only advancing the CPU state *after* the effects of the instruction are emulated. Cc: Peter Maydell Reviewed-by: Alex Bennée Reviewed-by: Christoffer Dall Signed-off-by: Mark Rutland Signed-off-by: Marc Zyngier Signed-off-by: Sasha Levin --- arch/arm/kvm/mmio.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/arch/arm/kvm/mmio.c b/arch/arm/kvm/mmio.c index 387ee2a11e36..885cd0e0015b 100644 --- a/arch/arm/kvm/mmio.c +++ b/arch/arm/kvm/mmio.c @@ -118,6 +118,12 @@ int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run) vcpu_set_reg(vcpu, vcpu->arch.mmio_decode.rt, data); } + /* + * The MMIO instruction is emulated and should not be re-executed + * in the guest. + */ + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + return 0; } @@ -151,11 +157,6 @@ static int decode_hsr(struct kvm_vcpu *vcpu, bool *is_write, int *len) vcpu->arch.mmio_decode.sign_extend = sign_extend; vcpu->arch.mmio_decode.rt = rt; - /* - * The MMIO instruction is emulated and should not be re-executed - * in the guest. - */ - kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); return 0; } -- 2.19.1