KVM: ARM: vgic: abstract VMCR access

Instead of directly messing with with the GICH_VMCR bits for the CPU
interface save/restore code, add accessors that encode/decode the
entire set of registers exposed by VMCR.

Not the most efficient thing, but given that this code is only used
by the save/restore code, performance is far from being critical.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index cdfa5d9..f515800 100644 (file)
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -81,6 +81,13 @@ struct vgic_lr {
        u8      state;
 };
 
+struct vgic_vmcr {
+       u32     ctlr;
+       u32     abpr;
+       u32     bpr;
+       u32     pmr;
+};
+
 struct vgic_ops {
        struct vgic_lr  (*get_lr)(const struct kvm_vcpu *, int);
        void    (*set_lr)(struct kvm_vcpu *, int, struct vgic_lr);
@@ -90,6 +97,8 @@ struct vgic_ops {
        u32     (*get_interrupt_status)(const struct kvm_vcpu *vcpu);
        void    (*enable_underflow)(struct kvm_vcpu *vcpu);
        void    (*disable_underflow)(struct kvm_vcpu *vcpu);
+       void    (*get_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+       void    (*set_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
 };
 
 struct vgic_dist {

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 6d618e0..5c70639 100644 (file)
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -100,8 +100,10 @@ static void vgic_kick_vcpus(struct kvm *kvm);
 static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg);
 static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr);
 static void vgic_set_lr(struct kvm_vcpu *vcpu, int lr, struct vgic_lr lr_desc);
-static u32 vgic_nr_lr;
+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 u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x,
@@ -1073,6 +1075,28 @@ static void vgic_v2_disable_underflow(struct kvm_vcpu *vcpu)
        vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr &= ~GICH_HCR_UIE;
 }
 
+static void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
+{
+       u32 vmcr = vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr;
+
+       vmcrp->ctlr = (vmcr & GICH_VMCR_CTRL_MASK) >> GICH_VMCR_CTRL_SHIFT;
+       vmcrp->abpr = (vmcr & GICH_VMCR_ALIAS_BINPOINT_MASK) >> GICH_VMCR_ALIAS_BINPOINT_SHIFT;
+       vmcrp->bpr  = (vmcr & GICH_VMCR_BINPOINT_MASK) >> GICH_VMCR_BINPOINT_SHIFT;
+       vmcrp->pmr  = (vmcr & GICH_VMCR_PRIMASK_MASK) >> GICH_VMCR_PRIMASK_SHIFT;
+}
+
+static void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
+{
+       u32 vmcr;
+
+       vmcr  = (vmcrp->ctlr << GICH_VMCR_CTRL_SHIFT) & GICH_VMCR_CTRL_MASK;
+       vmcr |= (vmcrp->abpr << GICH_VMCR_ALIAS_BINPOINT_SHIFT) & GICH_VMCR_ALIAS_BINPOINT_MASK;
+       vmcr |= (vmcrp->bpr << GICH_VMCR_BINPOINT_SHIFT) & GICH_VMCR_BINPOINT_MASK;
+       vmcr |= (vmcrp->pmr << GICH_VMCR_PRIMASK_SHIFT) & GICH_VMCR_PRIMASK_MASK;
+
+       vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = vmcr;
+}
+
 static const struct vgic_ops vgic_ops = {
        .get_lr                 = vgic_v2_get_lr,
        .set_lr                 = vgic_v2_set_lr,
@@ -1082,6 +1106,8 @@ static const struct vgic_ops vgic_ops = {
        .get_interrupt_status   = vgic_v2_get_interrupt_status,
        .enable_underflow       = vgic_v2_enable_underflow,
        .disable_underflow      = vgic_v2_disable_underflow,
+       .get_vmcr               = vgic_v2_get_vmcr,
+       .set_vmcr               = vgic_v2_set_vmcr,
 };
 
 static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr)
@@ -1126,6 +1152,16 @@ static inline void vgic_disable_underflow(struct kvm_vcpu *vcpu)
        vgic_ops.disable_underflow(vcpu);
 }
 
+static inline void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+{
+       vgic_ops.get_vmcr(vcpu, vmcr);
+}
+
+static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+{
+       vgic_ops.set_vmcr(vcpu, vmcr);
+}
+
 static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu)
 {
        struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
@@ -1879,39 +1915,40 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
 static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu,
                                 struct kvm_exit_mmio *mmio, phys_addr_t offset)
 {
-       struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
-       u32 reg, mask = 0, shift = 0;
        bool updated = false;
+       struct vgic_vmcr vmcr;
+       u32 *vmcr_field;
+       u32 reg;
+
+       vgic_get_vmcr(vcpu, &vmcr);
 
        switch (offset & ~0x3) {
        case GIC_CPU_CTRL:
-               mask = GICH_VMCR_CTRL_MASK;
-               shift = GICH_VMCR_CTRL_SHIFT;
+               vmcr_field = &vmcr.ctlr;
                break;
        case GIC_CPU_PRIMASK:
-               mask = GICH_VMCR_PRIMASK_MASK;
-               shift = GICH_VMCR_PRIMASK_SHIFT;
+               vmcr_field = &vmcr.pmr;
                break;
        case GIC_CPU_BINPOINT:
-               mask = GICH_VMCR_BINPOINT_MASK;
-               shift = GICH_VMCR_BINPOINT_SHIFT;
+               vmcr_field = &vmcr.bpr;
                break;
        case GIC_CPU_ALIAS_BINPOINT:
-               mask = GICH_VMCR_ALIAS_BINPOINT_MASK;
-               shift = GICH_VMCR_ALIAS_BINPOINT_SHIFT;
+               vmcr_field = &vmcr.abpr;
                break;
+       default:
+               BUG();
        }
 
        if (!mmio->is_write) {
-               reg = (vgic_cpu->vgic_v2.vgic_vmcr & mask) >> shift;
+               reg = *vmcr_field;
                mmio_data_write(mmio, ~0, reg);
        } else {
                reg = mmio_data_read(mmio, ~0);
-               reg = (reg << shift) & mask;
-               if (reg != (vgic_cpu->vgic_v2.vgic_vmcr & mask))
+               if (reg != *vmcr_field) {
+                       *vmcr_field = reg;
+                       vgic_set_vmcr(vcpu, &vmcr);
                        updated = true;
-               vgic_cpu->vgic_v2.vgic_vmcr &= ~mask;
-               vgic_cpu->vgic_v2.vgic_vmcr |= reg;
+               }
        }
        return updated;
 }