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charset="utf-8" From: Yi Wang Add a new function to setup empty irq routing in kvm path, which can be invoded in non-architecture-specific functions. The difference compared to the kvm_setup_empty_irq_routing() is this function just alloc the empty irq routing and does not need synchronize srcu, as we will call it in kvm_create_vm(). Using the new adding function, we can setup empty irq routing when kvm_create_vm(), so that x86 and s390 no longer need to set empty/dummy irq routing when creating an IRQCHIP 'cause it avoid an synchronize_srcu. Signed-off-by: Yi Wang --- include/linux/kvm_host.h | 1 + virt/kvm/irqchip.c | 19 +++++++++++++++++++ virt/kvm/kvm_main.c | 4 ++++ 3 files changed, 24 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 48f31dcd318a..9256539139ef 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -2100,6 +2100,7 @@ int kvm_set_irq_routing(struct kvm *kvm, const struct kvm_irq_routing_entry *entries, unsigned nr, unsigned flags); +int kvm_setup_empty_irq_routing_lockless(struct kvm *kvm); int kvm_set_routing_entry(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, const struct kvm_irq_routing_entry *ue); diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c index 1e567d1f6d3d..266bab99a8a8 100644 --- a/virt/kvm/irqchip.c +++ b/virt/kvm/irqchip.c @@ -237,3 +237,22 @@ int kvm_set_irq_routing(struct kvm *kvm, =20 return r; } + +int kvm_setup_empty_irq_routing_lockless(struct kvm *kvm) +{ + struct kvm_irq_routing_table *new; + int chip_size; + + new =3D kzalloc(struct_size(new, map, 1), GFP_KERNEL_ACCOUNT); 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Thu, 25 Apr 2024 21:16:37 -0700 (PDT) Received: from localhost.localdomain ([43.132.141.8]) by smtp.gmail.com with ESMTPSA id x13-20020a170902ec8d00b001e9684b0e07sm9426780plg.173.2024.04.25.21.16.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Apr 2024 21:16:36 -0700 (PDT) From: Yi Wang X-Google-Original-From: Yi Wang To: seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, wanpengli@tencent.com, foxywang@tencent.com, oliver.upton@linux.dev, maz@kernel.org, anup@brainfault.org, atishp@atishpatra.org, borntraeger@linux.ibm.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com, weijiang.yang@intel.com Cc: up2wing@gmail.com Subject: [v4 RESEND 2/3] KVM: x86: don't setup empty irq routing when KVM_CAP_SPLIT_IRQCHIP Date: Fri, 26 Apr 2024 12:15:58 +0800 Message-Id: <20240426041559.3717884-3-foxywang@tencent.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240426041559.3717884-1-foxywang@tencent.com> References: <20240426041559.3717884-1-foxywang@tencent.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yi Wang We found that it may cost more than 20 milliseconds very accidentally to enable cap of KVM_CAP_SPLIT_IRQCHIP on a host which has many vms already. The reason is that when vmm(qemu/CloudHypervisor) invokes KVM_CAP_SPLIT_IRQCHIP kvm will call synchronize_srcu_expedited() and might_sleep and kworker of srcu may cost some delay during this period. As we have set up empty irq routing when creating vm, so this is no need now. Signed-off-by: Yi Wang --- arch/x86/kvm/irq.h | 1 - arch/x86/kvm/irq_comm.c | 5 ----- arch/x86/kvm/x86.c | 3 --- 3 files changed, 9 deletions(-) diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h index c2d7cfe82d00..76d46b2f41dd 100644 --- a/arch/x86/kvm/irq.h +++ b/arch/x86/kvm/irq.h @@ -106,7 +106,6 @@ void __kvm_migrate_timers(struct kvm_vcpu *vcpu); int apic_has_pending_timer(struct kvm_vcpu *vcpu); =20 int kvm_setup_default_irq_routing(struct kvm *kvm); -int kvm_setup_empty_irq_routing(struct kvm *kvm); int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, struct kvm_lapic_irq *irq, struct dest_map *dest_map); diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index 68f3f6c26046..6ee7ca39466e 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -397,11 +397,6 @@ int kvm_setup_default_irq_routing(struct kvm *kvm) =20 static const struct kvm_irq_routing_entry empty_routing[] =3D {}; =20 -int kvm_setup_empty_irq_routing(struct kvm *kvm) -{ - return kvm_set_irq_routing(kvm, empty_routing, 0, 0); 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Thu, 25 Apr 2024 21:16:42 -0700 (PDT) Received: from localhost.localdomain ([43.132.141.8]) by smtp.gmail.com with ESMTPSA id x13-20020a170902ec8d00b001e9684b0e07sm9426780plg.173.2024.04.25.21.16.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Apr 2024 21:16:42 -0700 (PDT) From: Yi Wang X-Google-Original-From: Yi Wang To: seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, wanpengli@tencent.com, foxywang@tencent.com, oliver.upton@linux.dev, maz@kernel.org, anup@brainfault.org, atishp@atishpatra.org, borntraeger@linux.ibm.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com, weijiang.yang@intel.com Cc: up2wing@gmail.com Subject: [v4 RESEND 3/3] KVM: s390: don't setup dummy routing when KVM_CREATE_IRQCHIP Date: Fri, 26 Apr 2024 12:15:59 +0800 Message-Id: <20240426041559.3717884-4-foxywang@tencent.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240426041559.3717884-1-foxywang@tencent.com> References: <20240426041559.3717884-1-foxywang@tencent.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yi Wang As we have setup empty irq routing in kvm_create_vm(), there's no need to setup dummy routing when KVM_CREATE_IRQCHIP. Signed-off-by: Yi Wang --- arch/s390/kvm/kvm-s390.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 5147b943a864..ba7fd39bcbf4 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2998,14 +2998,7 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned in= t ioctl, unsigned long arg) break; } case KVM_CREATE_IRQCHIP: { - struct kvm_irq_routing_entry routing; - - r =3D -EINVAL; - if (kvm->arch.use_irqchip) { - /* Set up dummy routing. */ - memset(&routing, 0, sizeof(routing)); - r =3D kvm_set_irq_routing(kvm, &routing, 0, 0); - } + r =3D 0; break; } case KVM_SET_DEVICE_ATTR: { --=20 2.39.3