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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BF00C433F5 for ; Thu, 19 May 2022 13:46:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237828AbiESNpp (ORCPT ); Thu, 19 May 2022 09:45:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236749AbiESNp3 (ORCPT ); Thu, 19 May 2022 09:45:29 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFD62633B2 for ; Thu, 19 May 2022 06:45:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 65B5D6179E for ; Thu, 19 May 2022 13:45:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 59C8AC34119; Thu, 19 May 2022 13:45:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652967923; bh=3CjY4Pec448XotcyN2iqZqW/AXk9FKiq5AorkwA5PIo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ah5dMC5WL11TdBzKBFW4Bm7Zf9QsydkXGKdBlSpTd3G5QGJbK85WTN2cy469QC4ob /Ke2PCNB091Ze8VKttP1KicuACFtsKPLDbf24CemZhY1WpCwsnIwK16Ry1BBmcRU4V V4Ooe8GEU+9EvDOonvoO5BlORgY7iMI/1dlajlgTk/j03cJwQ89WlP3IFCKa7osB2v BTGEs6Abq4Tr/F35/f96HSYeol7vZc0gf6QUbYifbzXQYgPWmkqEfNFND86Mxc1zRh VI+zByOsw5wmlxrriGPanviEM+V75OACVZrfev4deRza+qgONZSTQpWJ+cD6DUDWk1 WemTltlhe7UrQ== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Cc: Will Deacon , Ard Biesheuvel , Sean Christopherson , Alexandru Elisei , Andy Lutomirski , Catalin Marinas , James Morse , Chao Peng , Quentin Perret , Suzuki K Poulose , Michael Roth , Mark Rutland , Fuad Tabba , Oliver Upton , Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 45/89] KVM: arm64: Add the {flush,sync}_timer_state() primitives Date: Thu, 19 May 2022 14:41:20 +0100 Message-Id: <20220519134204.5379-46-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220519134204.5379-1-will@kernel.org> References: <20220519134204.5379-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Marc Zyngier In preparation for save/restore of the timer state at EL2 for protected VMs, introduce a couple of sync/flush primitives for the architected timer, in much the same way as we have for the GIC. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 34 ++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index 58515e5d24ec..32e7e1cad00f 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -63,6 +63,38 @@ static void sync_vgic_state(struct kvm_vcpu *host_vcpu, WRITE_ONCE(host_cpu_if->vgic_lr[i], shadow_cpu_if->vgic_lr[i]); } +static void flush_timer_state(struct kvm_shadow_vcpu_state *shadow_state) +{ + struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; + + if (!shadow_state_is_protected(shadow_state)) + return; + + /* + * A shadow vcpu has no offset, and sees vtime == ptime. The + * ptimer is fully emulated by EL1 and cannot be trusted. + */ + write_sysreg(0, cntvoff_el2); + isb(); + write_sysreg_el0(__vcpu_sys_reg(shadow_vcpu, CNTV_CVAL_EL0), SYS_CNTV_CVAL); + write_sysreg_el0(__vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0), SYS_CNTV_CTL); +} + +static void sync_timer_state(struct kvm_shadow_vcpu_state *shadow_state) +{ + struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; + + if (!shadow_state_is_protected(shadow_state)) + return; + + /* + * Preserve the vtimer state so that it is always correct, + * even if the host tries to make a mess. + */ + __vcpu_sys_reg(shadow_vcpu, CNTV_CVAL_EL0) = read_sysreg_el0(SYS_CNTV_CVAL); + __vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0) = read_sysreg_el0(SYS_CNTV_CTL); +} + static void flush_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) { struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; @@ -85,6 +117,7 @@ static void flush_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) shadow_vcpu->arch.vsesr_el2 = host_vcpu->arch.vsesr_el2; flush_vgic_state(host_vcpu, shadow_vcpu); + flush_timer_state(shadow_state); } static void sync_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) @@ -102,6 +135,7 @@ static void sync_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) host_vcpu->arch.flags = shadow_vcpu->arch.flags; sync_vgic_state(host_vcpu, shadow_vcpu); + sync_timer_state(shadow_state); } static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt) -- 2.36.1.124.g0e6072fb45-goog 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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21443C433F5 for ; Thu, 19 May 2022 13:45:30 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D0D234B370; Thu, 19 May 2022 09:45:29 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); 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Thu, 19 May 2022 13:45:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 59C8AC34119; Thu, 19 May 2022 13:45:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652967923; bh=3CjY4Pec448XotcyN2iqZqW/AXk9FKiq5AorkwA5PIo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ah5dMC5WL11TdBzKBFW4Bm7Zf9QsydkXGKdBlSpTd3G5QGJbK85WTN2cy469QC4ob /Ke2PCNB091Ze8VKttP1KicuACFtsKPLDbf24CemZhY1WpCwsnIwK16Ry1BBmcRU4V V4Ooe8GEU+9EvDOonvoO5BlORgY7iMI/1dlajlgTk/j03cJwQ89WlP3IFCKa7osB2v BTGEs6Abq4Tr/F35/f96HSYeol7vZc0gf6QUbYifbzXQYgPWmkqEfNFND86Mxc1zRh VI+zByOsw5wmlxrriGPanviEM+V75OACVZrfev4deRza+qgONZSTQpWJ+cD6DUDWk1 WemTltlhe7UrQ== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Subject: [PATCH 45/89] KVM: arm64: Add the {flush, sync}_timer_state() primitives Date: Thu, 19 May 2022 14:41:20 +0100 Message-Id: <20220519134204.5379-46-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220519134204.5379-1-will@kernel.org> References: <20220519134204.5379-1-will@kernel.org> MIME-Version: 1.0 Cc: Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, Andy Lutomirski , linux-arm-kernel@lists.infradead.org, Michael Roth , Catalin Marinas , Chao Peng , Will Deacon X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu From: Marc Zyngier In preparation for save/restore of the timer state at EL2 for protected VMs, introduce a couple of sync/flush primitives for the architected timer, in much the same way as we have for the GIC. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 34 ++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index 58515e5d24ec..32e7e1cad00f 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -63,6 +63,38 @@ static void sync_vgic_state(struct kvm_vcpu *host_vcpu, WRITE_ONCE(host_cpu_if->vgic_lr[i], shadow_cpu_if->vgic_lr[i]); } +static void flush_timer_state(struct kvm_shadow_vcpu_state *shadow_state) +{ + struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; + + if (!shadow_state_is_protected(shadow_state)) + return; + + /* + * A shadow vcpu has no offset, and sees vtime == ptime. The + * ptimer is fully emulated by EL1 and cannot be trusted. + */ + write_sysreg(0, cntvoff_el2); + isb(); + write_sysreg_el0(__vcpu_sys_reg(shadow_vcpu, CNTV_CVAL_EL0), SYS_CNTV_CVAL); + write_sysreg_el0(__vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0), SYS_CNTV_CTL); +} + +static void sync_timer_state(struct kvm_shadow_vcpu_state *shadow_state) +{ + struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; + + if (!shadow_state_is_protected(shadow_state)) + return; + + /* + * Preserve the vtimer state so that it is always correct, + * even if the host tries to make a mess. + */ + __vcpu_sys_reg(shadow_vcpu, CNTV_CVAL_EL0) = read_sysreg_el0(SYS_CNTV_CVAL); + __vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0) = read_sysreg_el0(SYS_CNTV_CTL); +} + static void flush_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) { struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; @@ -85,6 +117,7 @@ static void flush_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) shadow_vcpu->arch.vsesr_el2 = host_vcpu->arch.vsesr_el2; flush_vgic_state(host_vcpu, shadow_vcpu); + flush_timer_state(shadow_state); } static void sync_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) @@ -102,6 +135,7 @@ static void sync_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) host_vcpu->arch.flags = shadow_vcpu->arch.flags; sync_vgic_state(host_vcpu, shadow_vcpu); + sync_timer_state(shadow_state); } static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt) -- 2.36.1.124.g0e6072fb45-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 5722EC433F5 for ; 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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 From: Marc Zyngier In preparation for save/restore of the timer state at EL2 for protected VMs, introduce a couple of sync/flush primitives for the architected timer, in much the same way as we have for the GIC. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 34 ++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index 58515e5d24ec..32e7e1cad00f 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -63,6 +63,38 @@ static void sync_vgic_state(struct kvm_vcpu *host_vcpu, WRITE_ONCE(host_cpu_if->vgic_lr[i], shadow_cpu_if->vgic_lr[i]); } +static void flush_timer_state(struct kvm_shadow_vcpu_state *shadow_state) +{ + struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; + + if (!shadow_state_is_protected(shadow_state)) + return; + + /* + * A shadow vcpu has no offset, and sees vtime == ptime. The + * ptimer is fully emulated by EL1 and cannot be trusted. + */ + write_sysreg(0, cntvoff_el2); + isb(); + write_sysreg_el0(__vcpu_sys_reg(shadow_vcpu, CNTV_CVAL_EL0), SYS_CNTV_CVAL); + write_sysreg_el0(__vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0), SYS_CNTV_CTL); +} + +static void sync_timer_state(struct kvm_shadow_vcpu_state *shadow_state) +{ + struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; + + if (!shadow_state_is_protected(shadow_state)) + return; + + /* + * Preserve the vtimer state so that it is always correct, + * even if the host tries to make a mess. + */ + __vcpu_sys_reg(shadow_vcpu, CNTV_CVAL_EL0) = read_sysreg_el0(SYS_CNTV_CVAL); + __vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0) = read_sysreg_el0(SYS_CNTV_CTL); +} + static void flush_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) { struct kvm_vcpu *shadow_vcpu = &shadow_state->shadow_vcpu; @@ -85,6 +117,7 @@ static void flush_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) shadow_vcpu->arch.vsesr_el2 = host_vcpu->arch.vsesr_el2; flush_vgic_state(host_vcpu, shadow_vcpu); + flush_timer_state(shadow_state); } static void sync_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) @@ -102,6 +135,7 @@ static void sync_shadow_state(struct kvm_shadow_vcpu_state *shadow_state) host_vcpu->arch.flags = shadow_vcpu->arch.flags; sync_vgic_state(host_vcpu, shadow_vcpu); + sync_timer_state(shadow_state); } static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt) -- 2.36.1.124.g0e6072fb45-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel