[v17,14/30] LoongArch: KVM: Implement vcpu load and vcpu put operations

Message ID	20230720062813.4126751-15-zhaotianrui@loongson.cn (mailing list archive)
State	New, archived
Headers	show Return-Path: <kvm-owner@vger.kernel.org> From: Tianrui Zhao <zhaotianrui@loongson.cn> To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini <pbonzini@redhat.com>, Huacai Chen <chenhuacai@kernel.org>, WANG Xuerui <kernel@xen0n.name>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, loongarch@lists.linux.dev, Jens Axboe <axboe@kernel.dk>, Mark Brown <broonie@kernel.org>, Alex Deucher <alexander.deucher@amd.com>, Oliver Upton <oliver.upton@linux.dev>, maobibo@loongson.cn, Xi Ruoyao <xry111@xry111.site>, 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> In-Reply-To: <20230720062813.4126751-1-zhaotianrui@loongson.cn> References: <20230720062813.4126751-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Add KVM LoongArch support \| expand [v17,00/30] Add KVM LoongArch support [v17,01/30] LoongArch: KVM: Add kvm related header files [v17,02/30] LoongArch: KVM: Implement kvm module related interface [v17,03/30] LoongArch: KVM: Implement kvm hardware enable, disable interface [v17,04/30] LoongArch: KVM: Implement VM related functions [v17,05/30] LoongArch: KVM: Add vcpu related header files [v17,06/30] LoongArch: KVM: Implement vcpu create and destroy interface [v17,07/30] LoongArch: KVM: Implement vcpu run interface [v17,08/30] LoongArch: KVM: Implement vcpu handle exit interface [v17,09/30] LoongArch: KVM: Implement vcpu get, vcpu set registers [v17,10/30] LoongArch: KVM: Implement vcpu ENABLE_CAP ioctl interface [v17,11/30] LoongArch: KVM: Implement fpu related operations for vcpu [v17,12/30] LoongArch: KVM: Implement vcpu interrupt operations [v17,13/30] LoongArch: KVM: Implement misc vcpu related interfaces [v17,14/30] LoongArch: KVM: Implement vcpu load and vcpu put operations [v17,15/30] LoongArch: KVM: Implement vcpu status description [v17,16/30] LoongArch: KVM: Implement update VM id function [v17,17/30] LoongArch: KVM: Implement virtual machine tlb operations [v17,18/30] LoongArch: KVM: Implement vcpu timer operations [v17,19/30] LoongArch: KVM: Implement kvm mmu operations [v17,20/30] LoongArch: KVM: Implement handle csr excption [v17,21/30] LoongArch: KVM: Implement handle iocsr exception [v17,22/30] LoongArch: KVM: Implement handle idle exception [v17,23/30] LoongArch: KVM: Implement handle gspr exception [v17,24/30] LoongArch: KVM: Implement handle mmio exception [v17,25/30] LoongArch: KVM: Implement handle fpu exception [v17,26/30] LoongArch: KVM: Implement kvm exception vector [v17,27/30] LoongArch: KVM: Implement vcpu world switch [v17,28/30] LoongArch: KVM: Enable kvm config and add the makefile [v17,29/30] LoongArch: KVM: Supplement kvm document about LoongArch-specific part [v17,30/30] LoongArch: KVM: Add maintainers for LoongArch KVM

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;

[v17,14/30] LoongArch: KVM: Implement vcpu load and vcpu put operations

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