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Thu, 20 Nov 2025 17:25:58 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Christoffer Dall , Fuad Tabba , Mark Brown Subject: [PATCH v4 17/49] KVM: arm64: GICv2: Extract LR folding primitive Date: Thu, 20 Nov 2025 17:25:07 +0000 Message-ID: <20251120172540.2267180-18-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251120172540.2267180-1-maz@kernel.org> References: <20251120172540.2267180-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, christoffer.dall@arm.com, tabba@google.com, broonie@kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251120_163043_329363_262BAE11 X-CRM114-Status: GOOD ( 18.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org As we are going to need to handle deactivation for interrupts that are not in the LRs, split vgic_v2_fold_lr_state() into a helper that deals with a single interrupt, and the function that loops over the used LRs. Tested-by: Fuad Tabba Signed-off-by: Marc Zyngier --- arch/arm64/kvm/vgic/vgic-v2.c | 67 +++++++++++++++++------------------ 1 file changed, 32 insertions(+), 35 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic-v2.c b/arch/arm64/kvm/vgic/vgic-v2.c index a0d803c5b08ae..fb8efdd4196b1 100644 --- a/arch/arm64/kvm/vgic/vgic-v2.c +++ b/arch/arm64/kvm/vgic/vgic-v2.c @@ -39,43 +39,23 @@ static bool lr_signals_eoi_mi(u32 lr_val) !(lr_val & GICH_LR_HW); } -/* - * transfer the content of the LRs back into the corresponding ap_list: - * - active bit is transferred as is - * - pending bit is - * - transferred as is in case of edge sensitive IRQs - * - set to the line-level (resample time) for level sensitive IRQs - */ -void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu) +static void vgic_v2_fold_lr(struct kvm_vcpu *vcpu, u32 val) { - struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; - struct vgic_v2_cpu_if *cpuif = &vgic_cpu->vgic_v2; - int lr; - - DEBUG_SPINLOCK_BUG_ON(!irqs_disabled()); - - cpuif->vgic_hcr &= ~GICH_HCR_UIE; + u32 cpuid, intid = val & GICH_LR_VIRTUALID; + struct vgic_irq *irq; + bool deactivated; - for (lr = 0; lr < vgic_cpu->vgic_v2.used_lrs; lr++) { - u32 val = cpuif->vgic_lr[lr]; - u32 cpuid, intid = val & GICH_LR_VIRTUALID; - struct vgic_irq *irq; - bool deactivated; + /* Extract the source vCPU id from the LR */ + cpuid = FIELD_GET(GICH_LR_PHYSID_CPUID, val) & 7; - /* Extract the source vCPU id from the LR */ - cpuid = val & GICH_LR_PHYSID_CPUID; - cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT; - cpuid &= 7; + /* Notify fds when the guest EOI'ed a level-triggered SPI */ + if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid)) + kvm_notify_acked_irq(vcpu->kvm, 0, + intid - VGIC_NR_PRIVATE_IRQS); - /* Notify fds when the guest EOI'ed a level-triggered SPI */ - if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid)) - kvm_notify_acked_irq(vcpu->kvm, 0, - intid - VGIC_NR_PRIVATE_IRQS); - - irq = vgic_get_vcpu_irq(vcpu, intid); - - raw_spin_lock(&irq->irq_lock); + irq = vgic_get_vcpu_irq(vcpu, intid); + scoped_guard(raw_spinlock, &irq->irq_lock) { /* Always preserve the active bit, note deactivation */ deactivated = irq->active && !(val & GICH_LR_ACTIVE_BIT); irq->active = !!(val & GICH_LR_ACTIVE_BIT); @@ -102,11 +82,28 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu) vgic_irq_handle_resampling(irq, deactivated, val & GICH_LR_PENDING_BIT); irq->on_lr = false; - - raw_spin_unlock(&irq->irq_lock); - vgic_put_irq(vcpu->kvm, irq); } + vgic_put_irq(vcpu->kvm, irq); +} + +/* + * transfer the content of the LRs back into the corresponding ap_list: + * - active bit is transferred as is + * - pending bit is + * - transferred as is in case of edge sensitive IRQs + * - set to the line-level (resample time) for level sensitive IRQs + */ +void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu) +{ + struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; + struct vgic_v2_cpu_if *cpuif = &vgic_cpu->vgic_v2; + + DEBUG_SPINLOCK_BUG_ON(!irqs_disabled()); + + for (int lr = 0; lr < vgic_cpu->vgic_v2.used_lrs; lr++) + vgic_v2_fold_lr(vcpu, cpuif->vgic_lr[lr]); + cpuif->used_lrs = 0; } -- 2.47.3