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[2620:137:e000::1:20]) by mx.google.com with ESMTP id qu6-20020a170907110600b0098e4aef0789si282095ejb.613.2023.07.20.00.08.52; Thu, 20 Jul 2023 00:09:16 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230416AbjGTG3K (ORCPT + 99 others); Thu, 20 Jul 2023 02:29:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230232AbjGTG2f (ORCPT ); Thu, 20 Jul 2023 02:28:35 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id ADED92130; Wed, 19 Jul 2023 23:28:25 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8CxbesD1Lhkho0HAA--.16708S3; Thu, 20 Jul 2023 14:28:19 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxvM7907hkHU81AA--.16059S16; Thu, 20 Jul 2023 14:28:18 +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 Subject: [PATCH v17 14/30] LoongArch: KVM: Implement vcpu load and vcpu put operations Date: Thu, 20 Jul 2023 14:27:57 +0800 Message-Id: <20230720062813.4126751-15-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230720062813.4126751-1-zhaotianrui@loongson.cn> References: <20230720062813.4126751-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8CxvM7907hkHU81AA--.16059S16 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1771922476187301486 X-GMAIL-MSGID: 1771922476187301486 Implement LoongArch vcpu load and vcpu put operations, including load csr value into hardware and save csr value into vcpu structure. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vcpu.c | 196 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 196 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 49dc2ff24d7d..8ce84ae6b841 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -592,6 +592,202 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) } } +static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvm_context *context; + struct loongarch_csrs *csr = vcpu->arch.csr; + bool migrated, all; + + /* + * Have we migrated to a different CPU? + * If so, any old guest TLB state may be stale. + */ + migrated = (vcpu->arch.last_sched_cpu != cpu); + + /* + * Was this the last vCPU to run on this CPU? + * If not, any old guest state from this vCPU will have been clobbered. + */ + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); + all = migrated || (context->last_vcpu != vcpu); + context->last_vcpu = vcpu; + + /* + * Restore timer state regardless + */ + kvm_restore_timer(vcpu); + + /* Control guest page CCA attribute */ + change_csr_gcfg(CSR_GCFG_MATC_MASK, CSR_GCFG_MATC_ROOT); + /* Don't bother restoring registers multiple times unless necessary */ + if (!all) + return 0; + + write_csr_gcntc((ulong)vcpu->kvm->arch.time_offset); + /* + * Restore guest CSR registers + */ + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CRMD); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PRMD); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EUEN); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_MISC); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ECFG); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ERA); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADV); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADI); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EENTRY); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ASID); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDL); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDH); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_RVACFG); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CPUID); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS0); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS1); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS2); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS3); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS4); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS5); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS6); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS7); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TMID); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CNTC); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3); + kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL); + + /* restore Root.Guestexcept from unused Guest guestexcept register */ + write_csr_gintc(csr->csrs[LOONGARCH_CSR_GINTC]); + + /* + * We should clear linked load bit to break interrupted atomics. This + * prevents a SC on the next vCPU from succeeding by matching a LL on + * the previous vCPU. + */ + if (vcpu->kvm->created_vcpus > 1) + set_gcsr_llbctl(CSR_LLBCTL_WCLLB); + + return 0; +} + +void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) +{ + unsigned long flags; + + local_irq_save(flags); + if (vcpu->arch.last_sched_cpu != cpu) { + kvm_debug("[%d->%d]KVM vCPU[%d] switch\n", + vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id); + /* + * Migrate the timer interrupt to the current CPU so that it + * always interrupts the guest and synchronously triggers a + * guest timer interrupt. + */ + kvm_migrate_count(vcpu); + } + + /* restore guest state to registers */ + _kvm_vcpu_load(vcpu, cpu); + local_irq_restore(flags); +} + +static int _kvm_vcpu_put(struct kvm_vcpu *vcpu, int cpu) +{ + struct loongarch_csrs *csr = vcpu->arch.csr; + + kvm_lose_fpu(vcpu); + /* + * update csr state from hardware if software csr state is stale, + * most csr registers are kept unchanged during process context + * switch except csr registers like remaining timer tick value and + * injected interrupt state. + */ + if (!(vcpu->arch.aux_inuse & KVM_LARCH_CSR)) { + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CRMD); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRMD); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EUEN); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_MISC); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ECFG); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ERA); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADV); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADI); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EENTRY); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ASID); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDL); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDH); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_RVACFG); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CPUID); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG1); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG2); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG3); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS0); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS1); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS2); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS3); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS4); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS5); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS6); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS7); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TMID); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CNTC); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2); + kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3); + vcpu->arch.aux_inuse |= KVM_LARCH_CSR; + } + /* save Root.Guestexcept in unused Guest guestexcept register */ + kvm_save_timer(vcpu); + csr->csrs[LOONGARCH_CSR_GINTC] = read_csr_gintc(); + return 0; +} + +void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) +{ + unsigned long flags; + int cpu; + + local_irq_save(flags); + cpu = smp_processor_id(); + vcpu->arch.last_sched_cpu = cpu; + + /* save guest state in registers */ + _kvm_vcpu_put(vcpu, cpu); + local_irq_restore(flags); +} + int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) { int r = -EINTR;