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Message-Id: <20230927030959.3629941-11-zhaotianrui@loongson.cn>
Date: Wed, 27 Sep 2023 11:09:44 +0800
From: Tianrui Zhao <zhaotianrui@...ngson.cn>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Huacai Chen <chenhuacai@...nel.org>,
WANG Xuerui <kernel@...0n.name>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
Mark Brown <broonie@...nel.org>,
Alex Deucher <alexander.deucher@....com>,
Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
Xi Ruoyao <xry111@...111.site>, zhaotianrui@...ngson.cn,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH v22 10/25] LoongArch: KVM: Implement vcpu load and vcpu put operations
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 <maobibo@...ngson.cn>
Tested-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
---
arch/loongarch/kvm/vcpu.c | 203 ++++++++++++++++++++++++++++++++++++++
1 file changed, 203 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 7576f5a735..b16fe2913e 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -569,6 +569,209 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
}
}
+static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ bool migrated;
+ struct kvm_context *context;
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+
+ /*
+ * 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);
+ if (migrated || (context->last_vcpu != vcpu))
+ vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
+ 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 (vcpu->arch.aux_inuse & KVM_LARCH_HWCSR_USABLE)
+ 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.GINTC from unused Guest.GINTC 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);
+
+ vcpu->arch.aux_inuse |= KVM_LARCH_HWCSR_USABLE;
+
+ 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_SWCSR_LATEST)
+ goto out;
+
+ 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_SWCSR_LATEST;
+
+out:
+ kvm_save_timer(vcpu);
+ /* Save Root.GINTC into unused Guest.GINTC register */
+ csr->csrs[LOONGARCH_CSR_GINTC] = read_csr_gintc();
+
+ return 0;
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+ int cpu;
+ unsigned long flags;
+
+ 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;
--
2.39.3
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