From patchwork Mon Jun 26 08:47:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhaotianrui X-Patchwork-Id: 13292502 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 9C998EB64DC for ; Mon, 26 Jun 2023 08:49:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230421AbjFZIs7 (ORCPT ); Mon, 26 Jun 2023 04:48:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230434AbjFZIsb (ORCPT ); Mon, 26 Jun 2023 04:48:31 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8FB0210C6; Mon, 26 Jun 2023 01:48:08 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8Dx+cXBUJlk1zQCAA--.3491S3; Mon, 26 Jun 2023 16:48:01 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bxxsy5UJlk4hQJAA--.19269S18; Mon, 26 Jun 2023 16:47:59 +0800 (CST) From: Tianrui Zhao To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Huacai Chen , WANG Xuerui , Greg Kroah-Hartman , loongarch@lists.linux.dev, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn, Xi Ruoyao , zhaotianrui@loongson.cn, tangyouling@loongson.cn Subject: [PATCH v15 16/30] LoongArch: KVM: Implement update VM id function Date: Mon, 26 Jun 2023 16:47:38 +0800 Message-Id: <20230626084752.1138621-17-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230626084752.1138621-1-zhaotianrui@loongson.cn> References: <20230626084752.1138621-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Bxxsy5UJlk4hQJAA--.19269S18 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Implement kvm check vmid and update vmid, the vmid should be checked before vcpu enter guest. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vmid.c | 66 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 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..380c25c5d12b --- /dev/null +++ b/arch/loongarch/kvm/vmid.c @@ -0,0 +1,66 @@ +// 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 = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); + vpid = context->vpid_cache + 1; + if (!(vpid & vpid_mask)) { + /* finish round of 64 bit loop */ + if (unlikely(!vpid)) + vpid = vpid_mask + 1; + + /* vpid 0 reserved for root */ + ++vpid; + + /* start new vpid cycle */ + kvm_flush_tlb_all(); + } + + context->vpid_cache = vpid; + vcpu->arch.vpid = vpid; +} + +void _kvm_check_vmid(struct kvm_vcpu *vcpu) +{ + struct kvm_context *context; + bool migrated; + unsigned long ver, old, vpid; + int cpu; + + cpu = smp_processor_id(); + /* + * 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 = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); + migrated = (vcpu->arch.last_exec_cpu != cpu); + vcpu->arch.last_exec_cpu = 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 = vcpu->arch.vpid & ~vpid_mask; + old = context->vpid_cache & ~vpid_mask; + if (migrated || (ver != old)) { + _kvm_update_vpid(vcpu, cpu); + trace_kvm_vpid_change(vcpu, vcpu->arch.vpid); + } + + /* Restore GSTAT(0x50).vpid */ + vpid = (vcpu->arch.vpid & vpid_mask) + << CSR_GSTAT_GID_SHIFT; + change_csr_gstat(vpid_mask << CSR_GSTAT_GID_SHIFT, vpid); +}