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 28300C433F5 for ; Mon, 4 Oct 2021 17:51:17 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E419061154 for ; Mon, 4 Oct 2021 17:51:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E419061154 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QkRdtIJMdMLtHHEo4zwxEpEZ/fwx7gcLfM+OT+B5vtI=; b=Aw1BGuhdTdeEww mP/CxuZD402zFijbyAi1ehTO9gLDDuVruhh127bcOwZkjJ8hnCyGi3vqdrpl8NsnXvc0mUBZN2gy9 2DAG7OqQC5tGsKZE58TlCNtl9zv8NrImJEicnnTjeg2trnpgKbHBnXjRBVQk2AQZN9/ki+0/bTyHf jWUxwDYhsPuxebDgt/R7cYmJXPbg7U0E1GH5HXpq3dGtjBd58pEhGp43csyMEX7u5s8CqRVismBkn FnINHX3HExrWa/2fzWCObcSVUngpj2funAMVqwY284jndrAiHuQ3BmxfUfsx9q7/EVc0AtjmpTHdt vo7QGaAnB6OhaODfwwmA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mXS5r-007RPb-MH; Mon, 04 Oct 2021 17:49:39 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mXS5H-007REN-0r for linux-arm-kernel@lists.infradead.org; Mon, 04 Oct 2021 17:49:04 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (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 7B85461244; Mon, 4 Oct 2021 17:49:02 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mXS5E-00EhBv-SD; Mon, 04 Oct 2021 18:49:00 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: will@kernel.org, qperret@google.com, dbrazdil@google.com, Steven Price , Andrew Jones , Fuad Tabba , Srivatsa Vaddagiri , Shanker R Donthineni , James Morse , Suzuki K Poulose , Alexandru Elisei , kernel-team@android.com Subject: [PATCH v2 05/16] KVM: arm64: Plumb MMIO checking into the fault handling Date: Mon, 4 Oct 2021 18:48:38 +0100 Message-Id: <20211004174849.2831548-6-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211004174849.2831548-1-maz@kernel.org> References: <20211004174849.2831548-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, will@kernel.org, qperret@google.com, dbrazdil@google.com, steven.price@arm.com, drjones@redhat.com, tabba@google.com, vatsa@codeaurora.org, sdonthineni@nvidia.com, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211004_104903_140278_839A9A1D X-CRM114-Status: GOOD ( 14.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Plumb the MMIO checking code into the MMIO fault handling code. Nothing allows a region to be registered yet, so there should be no funtional change either. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/mmio.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/arm64/kvm/mmio.c b/arch/arm64/kvm/mmio.c index 3dd38a151d2a..dfa375823264 100644 --- a/arch/arm64/kvm/mmio.c +++ b/arch/arm64/kvm/mmio.c @@ -6,6 +6,7 @@ #include #include +#include #include #include "trace.h" @@ -135,6 +136,13 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa) * volunteered to do so, and bail out otherwise. */ if (!kvm_vcpu_dabt_isvalid(vcpu)) { + /* With MMIO guard enabled, the guest should know better */ + if (test_bit(KVM_ARCH_FLAG_MMIO_GUARD, + &vcpu->kvm->arch.flags)) { + kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu)); + return 1; + } + if (test_bit(KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER, &vcpu->kvm->arch.flags)) { run->exit_reason = KVM_EXIT_ARM_NISV; @@ -156,6 +164,15 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa) len = kvm_vcpu_dabt_get_as(vcpu); rt = kvm_vcpu_dabt_get_rd(vcpu); + /* Check failed? Return to the guest for debriefing... */ + if (!kvm_check_ioguard_page(vcpu, fault_ipa)) + return 1; + + /* If we cross a page boundary, check that too... */ + if (((fault_ipa + len - 1) & PAGE_MASK) != (fault_ipa & PAGE_MASK) && + !kvm_check_ioguard_page(vcpu, fault_ipa + len - 1)) + return 1; + if (is_write) { data = vcpu_data_guest_to_host(vcpu, vcpu_get_reg(vcpu, rt), len); -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel