From nobody Wed Feb 11 12:12:55 2026 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 D9770C7EE32 for ; Tue, 9 May 2023 07:55:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235306AbjEIHzH (ORCPT ); Tue, 9 May 2023 03:55:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37528 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234614AbjEIHx7 (ORCPT ); Tue, 9 May 2023 03:53:59 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D05368A41; Tue, 9 May 2023 00:53:56 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8AxmOkT_FlkM+MGAA--.11406S3; Tue, 09 May 2023 15:53:55 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxFLUK_FlkIEhSAA--.16908S18; Tue, 09 May 2023 15:53:54 +0800 (CST) From: Tianrui Zhao To: Paolo Bonzini , Huacai Chen , WANG Xuerui Cc: Greg Kroah-Hartman , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn, Xi Ruoyao , zhaotianrui@loongson.cn Subject: [PATCH v9 16/30] LoongArch: KVM: Implement update VM id function Date: Tue, 9 May 2023 15:53:32 +0800 Message-Id: <20230509075346.1023386-17-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230509075346.1023386-1-zhaotianrui@loongson.cn> References: <20230509075346.1023386-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8BxFLUK_FlkIEhSAA--.16908S18 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7Aw1kJrW5GFWrWry3CF4rZrb_yoW8tr1rpr WxCrn5Wr4rXwnxu3sIqw10qrn09395JF13Xa47Ja4Yyr17t34qkrWvkrWDAFyxXr1rAryx XF15tF4jkF18A37anT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b4AFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6x kF7I0E14v26F4UJVW0owAaw2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAq jxCEc2xF0cIa020Ex4CE44I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E74AGY7Cv6c x26rWlOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4kS14v26r12 6r1DMxAIw28IcxkI7VAKI48JMxAIw28IcVCjz48v1sIEY20_WwCFx2IqxVCFs4IE7xkEbV WUJVW8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480 Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7 IYx2IY67AKxVWDJVCq3wCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr1j6F4UJwCI42IY6I8E87Iv6x kF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7xRiTKZJUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement kvm check vmid and update vmid, the vmid should be checked before vcpu enter guest. Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vmid.c | 64 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 arch/loongarch/kvm/vmid.c diff --git a/arch/loongarch/kvm/vmid.c b/arch/loongarch/kvm/vmid.c new file mode 100644 index 000000000000..6fef81b28a48 --- /dev/null +++ b/arch/loongarch/kvm/vmid.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited + */ + +#include +#include "trace.h" + +static void _kvm_update_vpid(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvm_context *context; + unsigned long vpid; + + context =3D per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); + vpid =3D context->vpid_cache + 1; + if (!(vpid & vpid_mask)) { + /* finish round of 64 bit loop */ + if (unlikely(!vpid)) + vpid =3D vpid_mask + 1; + + /* vpid 0 reserved for root */ + ++vpid; + + /* start new vpid cycle */ + kvm_flush_tlb_all(); + } + + context->vpid_cache =3D vpid; + vcpu->arch.vpid =3D vpid; +} + +void _kvm_check_vmid(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvm_context *context; + bool migrated; + unsigned long ver, old, vpid; + + /* + * Are we entering guest context on a different CPU to last time? + * If so, the vCPU's guest TLB state on this CPU may be stale. + */ + context =3D per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); + migrated =3D (vcpu->arch.last_exec_cpu !=3D cpu); + vcpu->arch.last_exec_cpu =3D cpu; + + /* + * Check if our vpid is of an older version + * + * We also discard the stored vpid if we've executed on + * another CPU, as the guest mappings may have changed without + * hypervisor knowledge. + */ + ver =3D vcpu->arch.vpid & ~vpid_mask; + old =3D context->vpid_cache & ~vpid_mask; + if (migrated || (ver !=3D old)) { + _kvm_update_vpid(vcpu, cpu); + trace_kvm_vpid_change(vcpu, vcpu->arch.vpid); + } + + /* Restore GSTAT(0x50).vpid */ + vpid =3D (vcpu->arch.vpid & vpid_mask) + << CSR_GSTAT_GID_SHIFT; + change_csr_gstat(vpid_mask << CSR_GSTAT_GID_SHIFT, vpid); +} --=20 2.31.1