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 B4A51C4332F for ; Tue, 20 Dec 2022 02:50:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232981AbiLTCuS (ORCPT ); Mon, 19 Dec 2022 21:50:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229647AbiLTCuQ (ORCPT ); Mon, 19 Dec 2022 21:50:16 -0500 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7773913CC6 for ; Mon, 19 Dec 2022 18:50:15 -0800 (PST) Received: from dggpemm500002.china.huawei.com (unknown [172.30.72.57]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4NbgyC1tz5zmWZg; Tue, 20 Dec 2022 10:49:07 +0800 (CST) Received: from localhost.localdomain (10.69.192.246) by dggpemm500002.china.huawei.com (7.185.36.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Tue, 20 Dec 2022 10:50:13 +0800 From: Dong Bo To: , , , CC: Nianyao Tang , Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Catalin Marinas , Will Deacon Subject: [PATCH] KVM: arm64: Synchronize SMEN on vcpu schedule out Date: Tue, 20 Dec 2022 18:50:24 +0800 Message-ID: <20221220105024.13484-1-dongbo4@huawei.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.69.192.246] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm500002.china.huawei.com (7.185.36.229) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nianyao Tang If we have VHE and need to reenable SME for host in kvm_arch_vcpu_put_fp, CPACR.SMEN is modified from 0 to 1. Trap control for reading SVCR is modified from enable to disable. Synchronization is needed before reading SVCR later in fpsimd_save, or it may cause sync exception which can not be handled by host. Cc: Marc Zyngier Cc: James Morse Cc: Alexandru Elisei Cc: Suzuki K Poulose Cc: Oliver Upton Cc: Catalin Marinas Cc: Will Deacon Signed-off-by: Nianyao Tang --- arch/arm64/kvm/fpsimd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c index 02dd7e9ebd39..f5799f571317 100644 --- a/arch/arm64/kvm/fpsimd.c +++ b/arch/arm64/kvm/fpsimd.c @@ -184,6 +184,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) sysreg_clear_set(CPACR_EL1, CPACR_EL1_SMEN_EL0EN, CPACR_EL1_SMEN_EL1EN); + isb(); } if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED) { -- 1.8.3.1