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Wed, 22 Apr 2020 13:01:03 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH 09/26] KVM: arm64: vgic-v3: Take cpu_if pointer directly instead of vcpu Date: Wed, 22 Apr 2020 13:00:33 +0100 Message-Id: <20200422120050.3693593-10-maz@kernel.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200422120050.3693593-1-maz@kernel.org> References: <20200422120050.3693593-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, andre.przywara@arm.com, christoffer.dall@arm.com, Dave.Martin@arm.com, jintack@cs.columbia.edu, alexandru.elisei@arm.com, gcherian@marvell.com, prime.zeng@hisilicon.com, will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: Will Deacon , Andre Przywara , Dave Martin , George Cherian , "Zengtao \(B\)" , Catalin Marinas X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu From: Christoffer Dall If we move the used_lrs field to the version-specific cpu interface structure, the following functions only operate on the struct vgic_v3_cpu_if and not the full vcpu: __vgic_v3_save_state __vgic_v3_restore_state __vgic_v3_activate_traps __vgic_v3_deactivate_traps __vgic_v3_save_aprs __vgic_v3_restore_aprs This is going to be very useful for nested virt, so move the used_lrs field and change the prototypes and implementations of these functions to take the cpu_if parameter directly. No functional change. Signed-off-by: Christoffer Dall Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_hyp.h | 12 ++++++------ arch/arm64/kvm/hyp/switch.c | 8 ++++---- include/kvm/arm_vgic.h | 5 ++++- virt/kvm/arm/hyp/vgic-v3-sr.c | 33 ++++++++++---------------------- virt/kvm/arm/vgic/vgic-v2.c | 10 +++++----- virt/kvm/arm/vgic/vgic-v3.c | 14 ++++++++------ virt/kvm/arm/vgic/vgic.c | 25 ++++++++++++++++-------- 7 files changed, 54 insertions(+), 53 deletions(-) diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index dcb63bf941057..f3c3d7645000f 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -55,12 +55,12 @@ int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu); -void __vgic_v3_save_state(struct kvm_vcpu *vcpu); -void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); -void __vgic_v3_activate_traps(struct kvm_vcpu *vcpu); -void __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu); -void __vgic_v3_save_aprs(struct kvm_vcpu *vcpu); -void __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu); +void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if); +void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if); +void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if); +void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if); +void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if); +void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if); int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu); void __timer_enable_traps(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index d79319038b119..c48c96565f1a7 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -270,8 +270,8 @@ static void __hyp_text __deactivate_vm(struct kvm_vcpu *vcpu) static void __hyp_text __hyp_vgic_save_state(struct kvm_vcpu *vcpu) { if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) { - __vgic_v3_save_state(vcpu); - __vgic_v3_deactivate_traps(vcpu); + __vgic_v3_save_state(&vcpu->arch.vgic_cpu.vgic_v3); + __vgic_v3_deactivate_traps(&vcpu->arch.vgic_cpu.vgic_v3); } } @@ -279,8 +279,8 @@ static void __hyp_text __hyp_vgic_save_state(struct kvm_vcpu *vcpu) static void __hyp_text __hyp_vgic_restore_state(struct kvm_vcpu *vcpu) { if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) { - __vgic_v3_activate_traps(vcpu); - __vgic_v3_restore_state(vcpu); + __vgic_v3_activate_traps(&vcpu->arch.vgic_cpu.vgic_v3); + __vgic_v3_restore_state(&vcpu->arch.vgic_cpu.vgic_v3); } } diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 69f4164d64776..a8d8fdcd37230 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -274,6 +274,8 @@ struct vgic_v2_cpu_if { u32 vgic_vmcr; u32 vgic_apr; u32 vgic_lr[VGIC_V2_MAX_LRS]; + + unsigned int used_lrs; }; struct vgic_v3_cpu_if { @@ -291,6 +293,8 @@ struct vgic_v3_cpu_if { * linking the Linux IRQ subsystem and the ITS together. */ struct its_vpe its_vpe; + + unsigned int used_lrs; }; struct vgic_cpu { @@ -300,7 +304,6 @@ struct vgic_cpu { struct vgic_v3_cpu_if vgic_v3; }; - unsigned int used_lrs; struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS]; raw_spinlock_t ap_list_lock; /* Protects the ap_list */ diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c index ccf1fde9836c1..2ea9a0b73fc44 100644 --- a/virt/kvm/arm/hyp/vgic-v3-sr.c +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c @@ -194,10 +194,9 @@ static u32 __hyp_text __vgic_v3_read_ap1rn(int n) return val; } -void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu) +void __hyp_text __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if) { - struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; - u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs; + u64 used_lrs = cpu_if->used_lrs; /* * Make sure stores to the GIC via the memory mapped interface @@ -230,10 +229,9 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu) } } -void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu) +void __hyp_text __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if) { - struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; - u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs; + u64 used_lrs = cpu_if->used_lrs; int i; if (used_lrs || cpu_if->its_vpe.its_vm) { @@ -257,10 +255,8 @@ void __hyp_text __vgic_v3_restore_state(struct kvm_vcpu *vcpu) } } -void __hyp_text __vgic_v3_activate_traps(struct kvm_vcpu *vcpu) +void __hyp_text __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if) { - struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; - /* * VFIQEn is RES1 if ICC_SRE_EL1.SRE is 1. This causes a * Group0 interrupt (as generated in GICv2 mode) to be @@ -306,9 +302,8 @@ void __hyp_text __vgic_v3_activate_traps(struct kvm_vcpu *vcpu) write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2); } -void __hyp_text __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu) +void __hyp_text __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if) { - struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; u64 val; if (!cpu_if->vgic_sre) { @@ -333,15 +328,11 @@ void __hyp_text __vgic_v3_deactivate_traps(struct kvm_vcpu *vcpu) write_gicreg(0, ICH_HCR_EL2); } -void __hyp_text __vgic_v3_save_aprs(struct kvm_vcpu *vcpu) +void __hyp_text __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if) { - struct vgic_v3_cpu_if *cpu_if; u64 val; u32 nr_pre_bits; - vcpu = kern_hyp_va(vcpu); - cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; - val = read_gicreg(ICH_VTR_EL2); nr_pre_bits = vtr_to_nr_pre_bits(val); @@ -370,15 +361,11 @@ void __hyp_text __vgic_v3_save_aprs(struct kvm_vcpu *vcpu) } } -void __hyp_text __vgic_v3_restore_aprs(struct kvm_vcpu *vcpu) +void __hyp_text __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if) { - struct vgic_v3_cpu_if *cpu_if; u64 val; u32 nr_pre_bits; - vcpu = kern_hyp_va(vcpu); - cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; - val = read_gicreg(ICH_VTR_EL2); nr_pre_bits = vtr_to_nr_pre_bits(val); @@ -453,7 +440,7 @@ static int __hyp_text __vgic_v3_highest_priority_lr(struct kvm_vcpu *vcpu, u32 vmcr, u64 *lr_val) { - unsigned int used_lrs = vcpu->arch.vgic_cpu.used_lrs; + unsigned int used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs; u8 priority = GICv3_IDLE_PRIORITY; int i, lr = -1; @@ -492,7 +479,7 @@ static int __hyp_text __vgic_v3_highest_priority_lr(struct kvm_vcpu *vcpu, static int __hyp_text __vgic_v3_find_active_lr(struct kvm_vcpu *vcpu, int intid, u64 *lr_val) { - unsigned int used_lrs = vcpu->arch.vgic_cpu.used_lrs; + unsigned int used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs; int i; for (i = 0; i < used_lrs; i++) { diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c index 621cc168fe3f7..ebf53a4e12963 100644 --- a/virt/kvm/arm/vgic/vgic-v2.c +++ b/virt/kvm/arm/vgic/vgic-v2.c @@ -56,7 +56,7 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu) cpuif->vgic_hcr &= ~GICH_HCR_UIE; - for (lr = 0; lr < vgic_cpu->used_lrs; lr++) { + 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; @@ -120,7 +120,7 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu) vgic_put_irq(vcpu->kvm, irq); } - vgic_cpu->used_lrs = 0; + cpuif->used_lrs = 0; } /* @@ -427,7 +427,7 @@ int vgic_v2_probe(const struct gic_kvm_info *info) static void save_lrs(struct kvm_vcpu *vcpu, void __iomem *base) { struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2; - u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs; + u64 used_lrs = cpu_if->used_lrs; u64 elrsr; int i; @@ -448,7 +448,7 @@ static void save_lrs(struct kvm_vcpu *vcpu, void __iomem *base) void vgic_v2_save_state(struct kvm_vcpu *vcpu) { void __iomem *base = kvm_vgic_global_state.vctrl_base; - u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs; + u64 used_lrs = vcpu->arch.vgic_cpu.vgic_v2.used_lrs; if (!base) return; @@ -463,7 +463,7 @@ void vgic_v2_restore_state(struct kvm_vcpu *vcpu) { struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2; void __iomem *base = kvm_vgic_global_state.vctrl_base; - u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs; + u64 used_lrs = cpu_if->used_lrs; int i; if (!base) diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 2c9fc13e2c590..118d044f48ddf 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -39,7 +39,7 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu) cpuif->vgic_hcr &= ~ICH_HCR_UIE; - for (lr = 0; lr < vgic_cpu->used_lrs; lr++) { + for (lr = 0; lr < cpuif->used_lrs; lr++) { u64 val = cpuif->vgic_lr[lr]; u32 intid, cpuid; struct vgic_irq *irq; @@ -111,7 +111,7 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu) vgic_put_irq(vcpu->kvm, irq); } - vgic_cpu->used_lrs = 0; + cpuif->used_lrs = 0; } /* Requires the irq to be locked already */ @@ -664,10 +664,10 @@ void vgic_v3_load(struct kvm_vcpu *vcpu) if (likely(cpu_if->vgic_sre)) kvm_call_hyp(__vgic_v3_write_vmcr, cpu_if->vgic_vmcr); - kvm_call_hyp(__vgic_v3_restore_aprs, vcpu); + kvm_call_hyp(__vgic_v3_restore_aprs, kern_hyp_va(cpu_if)); if (has_vhe()) - __vgic_v3_activate_traps(vcpu); + __vgic_v3_activate_traps(cpu_if); WARN_ON(vgic_v4_load(vcpu)); } @@ -682,12 +682,14 @@ void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu) void vgic_v3_put(struct kvm_vcpu *vcpu) { + struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; + WARN_ON(vgic_v4_put(vcpu, false)); vgic_v3_vmcr_sync(vcpu); - kvm_call_hyp(__vgic_v3_save_aprs, vcpu); + kvm_call_hyp(__vgic_v3_save_aprs, kern_hyp_va(cpu_if)); if (has_vhe()) - __vgic_v3_deactivate_traps(vcpu); + __vgic_v3_deactivate_traps(cpu_if); } diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index 99b02ca730a87..c3643b7f101b7 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -786,6 +786,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) int count; bool multi_sgi; u8 prio = 0xff; + int i = 0; lockdep_assert_held(&vgic_cpu->ap_list_lock); @@ -827,11 +828,14 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) } } - vcpu->arch.vgic_cpu.used_lrs = count; - /* Nuke remaining LRs */ - for ( ; count < kvm_vgic_global_state.nr_lr; count++) - vgic_clear_lr(vcpu, count); + for (i = count ; i < kvm_vgic_global_state.nr_lr; i++) + vgic_clear_lr(vcpu, i); + + if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + vcpu->arch.vgic_cpu.vgic_v2.used_lrs = count; + else + vcpu->arch.vgic_cpu.vgic_v3.used_lrs = count; } static inline bool can_access_vgic_from_kernel(void) @@ -849,13 +853,13 @@ static inline void vgic_save_state(struct kvm_vcpu *vcpu) if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) vgic_v2_save_state(vcpu); else - __vgic_v3_save_state(vcpu); + __vgic_v3_save_state(&vcpu->arch.vgic_cpu.vgic_v3); } /* Sync back the hardware VGIC state into our emulation after a guest's run. */ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) { - struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; + int used_lrs; /* An empty ap_list_head implies used_lrs == 0 */ if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head)) @@ -864,7 +868,12 @@ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) if (can_access_vgic_from_kernel()) vgic_save_state(vcpu); - if (vgic_cpu->used_lrs) + if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + used_lrs = vcpu->arch.vgic_cpu.vgic_v2.used_lrs; + else + used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs; + + if (used_lrs) vgic_fold_lr_state(vcpu); vgic_prune_ap_list(vcpu); } @@ -874,7 +883,7 @@ static inline void vgic_restore_state(struct kvm_vcpu *vcpu) if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) vgic_v2_restore_state(vcpu); else - __vgic_v3_restore_state(vcpu); + __vgic_v3_restore_state(&vcpu->arch.vgic_cpu.vgic_v3); } /* Flush our emulation state into the GIC hardware before entering the guest. */ -- 2.26.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm