From patchwork Tue Aug 28 15:51:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Thierry X-Patchwork-Id: 10578773 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8C405139B for ; Tue, 28 Aug 2018 16:02:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7936E2A628 for ; Tue, 28 Aug 2018 16:02:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6B0D32A639; Tue, 28 Aug 2018 16:02:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 71DA32A628 for ; Tue, 28 Aug 2018 16:02:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=H3DdNYeusJqibBfkxFEaswhchseq+c59ASFErSnKDVA=; b=bzvsbX8FGI6Dsdn1r0HeQNlUqm x4tPMq76pS0KFXT2Uef2VoNicE/3aiuySXj7vLxCEgjiYPMKeVMGHflvgfEHv8kXTRQg3ZDh5HhYq r3IEvgTtO5XykeilU8lUn/HOXnakR1/WYnpJTd/Ym5XGJzRbbfrEi/nw5tJEmNiMhLMbTQXDZygZ/ S8lmYlZB21mgPY3IdB84Grrk27wMZjrHhXF/KLhgZLyvcQmfkMAh+npbAnx4l6oGDk3PQYLZdKLr/ HYmrANZehpQa8f9Z8Ub0SmuVyR5SJnAQ32SkdnmKIMISjOzD3UEXEPyf40HU8R0DZCfiC63pkV6JE tWej2y1A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fugRN-0003Fm-Km; Tue, 28 Aug 2018 16:02:01 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fugI1-00058P-BV for linux-arm-kernel@lists.infradead.org; Tue, 28 Aug 2018 15:52:23 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4D35AED1; Tue, 28 Aug 2018 08:52:21 -0700 (PDT) Received: from e112298-lin.Emea.Arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 3BB273F557; Tue, 28 Aug 2018 08:52:19 -0700 (PDT) From: Julien Thierry To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 14/27] arm64: kvm: Unmask PMR before entering guest Date: Tue, 28 Aug 2018 16:51:24 +0100 Message-Id: <1535471497-38854-15-git-send-email-julien.thierry@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1535471497-38854-1-git-send-email-julien.thierry@arm.com> References: <1535471497-38854-1-git-send-email-julien.thierry@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180828_085221_490841_3BBC4103 X-CRM114-Status: GOOD ( 14.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, daniel.thompson@linaro.org, Julien Thierry , marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, christoffer.dall@arm.com, james.morse@arm.com, joel@joelfernandes.org, kvmarm@lists.cs.columbia.edu MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Interrupts masked by ICC_PMR_EL1 will not be signaled to the CPU. This means that hypervisor will not receive masked interrupts while running a guest. Avoid this by making sure ICC_PMR_EL1 is unmasked when we enter a guest. Tested-by: Daniel Thompson Signed-off-by: Julien Thierry Cc: Christoffer Dall Cc: Marc Zyngier Cc: Catalin Marinas Cc: Will Deacon Cc: kvmarm@lists.cs.columbia.edu --- arch/arm64/include/asm/kvm_host.h | 12 ++++++++++++ arch/arm64/kvm/hyp/switch.c | 17 +++++++++++++++++ 2 files changed, 29 insertions(+) -- 1.9.1 diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index f26055f..9689592 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -24,6 +24,7 @@ #include #include +#include #include #include #include @@ -466,6 +467,17 @@ static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu) static inline void kvm_arm_vhe_guest_enter(void) { local_daif_mask(); + + /* + * Having IRQs masked via PMR when entering the guest means the GIC + * will not signal the CPU of interrupts of lower priority, and the + * only way to get out will be via guest exceptions. + * Naturally, we want to avoid this. + */ + if (gic_prio_masking_enabled()) { + gic_write_pmr(ICC_PMR_EL1_UNMASKED); + dsb(sy); + } } static inline void kvm_arm_vhe_guest_exit(void) diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index d496ef5..074ab21 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -22,6 +22,7 @@ #include +#include #include #include #include @@ -533,6 +534,19 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu) struct kvm_cpu_context *host_ctxt; struct kvm_cpu_context *guest_ctxt; u64 exit_code; + u32 host_pmr = ICC_PMR_EL1_UNMASKED; + + /* + * Having IRQs masked via PMR when entering the guest means the GIC + * will not signal the CPU of interrupts of lower priority, and the + * only way to get out will be via guest exceptions. + * Naturally, we want to avoid this. + */ + if (gic_prio_masking_enabled()) { + host_pmr = gic_read_pmr(); + gic_write_pmr(ICC_PMR_EL1_UNMASKED); + dsb(sy); + } vcpu = kern_hyp_va(vcpu); @@ -586,6 +600,9 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu) */ __debug_switch_to_host(vcpu); + if (gic_prio_masking_enabled()) + gic_write_pmr(host_pmr); + return exit_code; }