KVM: arm/arm64: rework MMIO abort handling to use KVM MMIO bus

Currently we have struct kvm_exit_mmio for encapsulating MMIO abort
data to be passed on from syndrome decoding all the way down to the
VGIC register handlers. Now as we switch the MMIO handling to be
routed through the KVM MMIO bus, it does not make sense anymore to
use that structure already from the beginning. So we keep the data in
local variables until we put them into the kvm_io_bus framework.
Then we fill kvm_exit_mmio in the VGIC only, making it a VGIC private
structure. On that way we replace the data buffer in that structure
with a pointer pointing to a single location in a local variable, so
we get rid of some copying on the way.
With all of the virtual GIC emulation code now being registered with
the kvm_io_bus, we can remove all of the old MMIO handling code and
its dispatching functionality.

I didn't bother to rename kvm_exit_mmio (to vgic_mmio or something),
because that touches a lot of code lines without any good reason.

This is based on an original patch by Nikolay.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Cc: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index d6705f447c28..16ec2c8b784d 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -140,8 +140,6 @@ struct vgic_params {
 };
 
 struct vgic_vm_ops {
-        bool    (*handle_mmio)(struct kvm_vcpu *, struct kvm_run *,
-                               struct kvm_exit_mmio *);
         bool    (*queue_sgi)(struct kvm_vcpu *, int irq);
         void    (*add_sgi_source)(struct kvm_vcpu *, int irq, int source);
         int     (*init_model)(struct kvm *);
@@ -313,8 +311,6 @@ struct vgic_cpu {
 
 struct kvm;
 struct kvm_vcpu;
-struct kvm_run;
-struct kvm_exit_mmio;
 
 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
 int kvm_vgic_hyp_init(void);
@@ -330,8 +326,6 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
 void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
 int kvm_vgic_vcpu_active_irq(struct kvm_vcpu *vcpu);
-bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
-                      struct kvm_exit_mmio *mmio);
 
 #define irqchip_in_kernel(k)    (!!((k)->arch.vgic.in_kernel))
 #define vgic_initialized(k)     (!!((k)->arch.vgic.nr_cpus))