[PATCH v3 13/19] KVM: ARM: introduce vgic_params structure
Christoffer Dall
christoffer.dall at linaro.org
Fri May 9 07:06:52 PDT 2014
On Wed, Apr 16, 2014 at 02:39:45PM +0100, Marc Zyngier wrote:
> Move all the data specific to a given GIC implementation into its own
> little structure.
>
> Acked-by: Catalin Marinas <catalin.marinas at arm.com>
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
> ---
> include/kvm/arm_vgic.h | 11 +++++++++
> virt/kvm/arm/vgic.c | 66 +++++++++++++++++++++-----------------------------
> 2 files changed, 39 insertions(+), 38 deletions(-)
>
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index 58a938f..23922b9 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -101,6 +101,17 @@ struct vgic_ops {
> void (*enable)(struct kvm_vcpu *vcpu);
> };
>
> +struct vgic_params {
> + /* Physical address of vgic virtual cpu interface */
> + phys_addr_t vcpu_base;
> + /* Number of list registers */
> + u32 nr_lr;
> + /* Interrupt number */
> + unsigned int maint_irq;
> + /* Virtual control interface base address */
> + void __iomem *vctrl_base;
> +};
> +
> struct vgic_dist {
> #ifdef CONFIG_KVM_ARM_VGIC
> spinlock_t lock;
> diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
> index a6d70fc..c22afce 100644
> --- a/virt/kvm/arm/vgic.c
> +++ b/virt/kvm/arm/vgic.c
> @@ -76,14 +76,6 @@
> #define IMPLEMENTER_ARM 0x43b
> #define GICC_ARCH_VERSION_V2 0x2
>
> -/* Physical address of vgic virtual cpu interface */
> -static phys_addr_t vgic_vcpu_base;
> -
> -/* Virtual control interface base address */
> -static void __iomem *vgic_vctrl_base;
> -
> -static struct device_node *vgic_node;
> -
> #define ACCESS_READ_VALUE (1 << 0)
> #define ACCESS_READ_RAZ (0 << 0)
> #define ACCESS_READ_MASK(x) ((x) & (1 << 0))
> @@ -103,8 +95,7 @@ static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc);
> static void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
> static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
>
> -static u32 vgic_nr_lr;
> -static unsigned int vgic_maint_irq;
> +static struct vgic_params vgic;
>
> static u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x,
> int cpuid, u32 offset)
> @@ -1183,7 +1174,7 @@ static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
> struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
> int lr;
>
> - for_each_set_bit(lr, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
> + for_each_set_bit(lr, vgic_cpu->lr_used, vgic.nr_lr) {
Does the architecture mandate the same number of list registers per CPU
interface? Couldn't quickly find this in the spec.
> struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
>
> if (!vgic_irq_is_enabled(vcpu, vlr.irq)) {
> @@ -1227,8 +1218,8 @@ static bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
>
> /* Try to use another LR for this interrupt */
> lr = find_first_zero_bit((unsigned long *)vgic_cpu->lr_used,
> - vgic_cpu->nr_lr);
> - if (lr >= vgic_cpu->nr_lr)
> + vgic.nr_lr);
> + if (lr >= vgic.nr_lr)
> return false;
>
> kvm_debug("LR%d allocated for IRQ%d %x\n", lr, irq, sgi_source_id);
> @@ -1354,7 +1345,6 @@ epilog:
>
> static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
> {
> - struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
> u32 status = vgic_get_interrupt_status(vcpu);
> bool level_pending = false;
>
> @@ -1369,8 +1359,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
> unsigned long *eisr_ptr = (unsigned long *)&eisr;
> int lr;
>
> - for_each_set_bit(lr, eisr_ptr, vgic_cpu->nr_lr) {
> - vgic_cpu->nr_lr) {
> + for_each_set_bit(lr, eisr_ptr, vgic.nr_lr) {
ah, compile is happy again
> struct vgic_lr vlr = vgic_get_lr(vcpu, lr);
>
> vgic_irq_clear_active(vcpu, vlr.irq);
> @@ -1409,7 +1398,7 @@ static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
> level_pending = vgic_process_maintenance(vcpu);
>
> /* Clear mappings for empty LRs */
> - for_each_set_bit(lr, elrsr_ptr, vgic_cpu->nr_lr) {
> + for_each_set_bit(lr, elrsr_ptr, vgic.nr_lr) {
> struct vgic_lr vlr;
>
> if (!test_and_clear_bit(lr, vgic_cpu->lr_used))
> @@ -1422,8 +1411,8 @@ static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
> }
>
> /* Check if we still have something up our sleeve... */
> - pending = find_first_zero_bit(elrsr_ptr, vgic_cpu->nr_lr);
> - if (level_pending || pending < vgic_cpu->nr_lr)
> + pending = find_first_zero_bit(elrsr_ptr, vgic.nr_lr);
> + if (level_pending || pending < vgic.nr_lr)
> set_bit(vcpu->vcpu_id, &dist->irq_pending_on_cpu);
> }
>
> @@ -1612,7 +1601,7 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
> vgic_cpu->vgic_irq_lr_map[i] = LR_EMPTY;
> }
>
> - vgic_cpu->nr_lr = vgic_nr_lr;
> + vgic_cpu->nr_lr = vgic.nr_lr;
why are we setting this is we're keeping this globally and stopped
referring to this all over the code? assembly code that only has a
vgic_cpu pointer? If so, comment so new code knows which value to use?
>
> vgic_enable(vcpu);
>
> @@ -1621,7 +1610,7 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
>
> static void vgic_init_maintenance_interrupt(void *info)
> {
> - enable_percpu_irq(vgic_maint_irq, 0);
> + enable_percpu_irq(vgic.maint_irq, 0);
> }
>
> static int vgic_cpu_notify(struct notifier_block *self,
> @@ -1634,7 +1623,7 @@ static int vgic_cpu_notify(struct notifier_block *self,
> break;
> case CPU_DYING:
> case CPU_DYING_FROZEN:
> - disable_percpu_irq(vgic_maint_irq);
> + disable_percpu_irq(vgic.maint_irq);
> break;
> }
>
> @@ -1650,6 +1639,7 @@ int kvm_vgic_hyp_init(void)
> int ret;
> struct resource vctrl_res;
> struct resource vcpu_res;
> + struct device_node *vgic_node;
>
> vgic_node = of_find_compatible_node(NULL, NULL, "arm,cortex-a15-gic");
> if (!vgic_node) {
> @@ -1657,17 +1647,17 @@ int kvm_vgic_hyp_init(void)
> return -ENODEV;
> }
>
> - vgic_maint_irq = irq_of_parse_and_map(vgic_node, 0);
> - if (!vgic_maint_irq) {
> + vgic.maint_irq = irq_of_parse_and_map(vgic_node, 0);
> + if (!vgic.maint_irq) {
> kvm_err("error getting vgic maintenance irq from DT\n");
> ret = -ENXIO;
> goto out;
> }
>
> - ret = request_percpu_irq(vgic_maint_irq, vgic_maintenance_handler,
> + ret = request_percpu_irq(vgic.maint_irq, vgic_maintenance_handler,
> "vgic", kvm_get_running_vcpus());
> if (ret) {
> - kvm_err("Cannot register interrupt %d\n", vgic_maint_irq);
> + kvm_err("Cannot register interrupt %d\n", vgic.maint_irq);
> goto out;
> }
>
> @@ -1683,18 +1673,18 @@ int kvm_vgic_hyp_init(void)
> goto out_free_irq;
> }
>
> - vgic_vctrl_base = of_iomap(vgic_node, 2);
> - if (!vgic_vctrl_base) {
> + vgic.vctrl_base = of_iomap(vgic_node, 2);
> + if (!vgic.vctrl_base) {
> kvm_err("Cannot ioremap VCTRL\n");
> ret = -ENOMEM;
> goto out_free_irq;
> }
>
> - vgic_nr_lr = readl_relaxed(vgic_vctrl_base + GICH_VTR);
> - vgic_nr_lr = (vgic_nr_lr & 0x3f) + 1;
> + vgic.nr_lr = readl_relaxed(vgic.vctrl_base + GICH_VTR);
> + vgic.nr_lr = (vgic.nr_lr & 0x3f) + 1;
>
> - ret = create_hyp_io_mappings(vgic_vctrl_base,
> - vgic_vctrl_base + resource_size(&vctrl_res),
> + ret = create_hyp_io_mappings(vgic.vctrl_base,
> + vgic.vctrl_base + resource_size(&vctrl_res),
> vctrl_res.start);
> if (ret) {
> kvm_err("Cannot map VCTRL into hyp\n");
> @@ -1702,7 +1692,7 @@ int kvm_vgic_hyp_init(void)
> }
>
> kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
> - vctrl_res.start, vgic_maint_irq);
> + vctrl_res.start, vgic.maint_irq);
> on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1);
>
> if (of_address_to_resource(vgic_node, 3, &vcpu_res)) {
> @@ -1710,14 +1700,14 @@ int kvm_vgic_hyp_init(void)
> ret = -ENXIO;
> goto out_unmap;
> }
> - vgic_vcpu_base = vcpu_res.start;
> + vgic.vcpu_base = vcpu_res.start;
>
> goto out;
>
> out_unmap:
> - iounmap(vgic_vctrl_base);
> + iounmap(vgic.vctrl_base);
> out_free_irq:
> - free_percpu_irq(vgic_maint_irq, kvm_get_running_vcpus());
> + free_percpu_irq(vgic.maint_irq, kvm_get_running_vcpus());
> out:
> of_node_put(vgic_node);
> return ret;
> @@ -1752,7 +1742,7 @@ int kvm_vgic_init(struct kvm *kvm)
> }
>
> ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base,
> - vgic_vcpu_base, KVM_VGIC_V2_CPU_SIZE);
> + vgic.vcpu_base, KVM_VGIC_V2_CPU_SIZE);
> if (ret) {
> kvm_err("Unable to remap VGIC CPU to VCPU\n");
> goto out;
> @@ -1798,7 +1788,7 @@ int kvm_vgic_create(struct kvm *kvm)
> }
>
> spin_lock_init(&kvm->arch.vgic.lock);
> - kvm->arch.vgic.vctrl_base = vgic_vctrl_base;
> + kvm->arch.vgic.vctrl_base = vgic.vctrl_base;
> kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
> kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
>
> --
> 1.8.3.4
>
Besides the small question,
Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>
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