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KVM: arm/arm64: vgic-new: Add MMIO handling framework

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Add an MMIO handling framework to the VGIC emulation:
Each register is described by its offset, size (or number of bits per
IRQ, if applicable) and the read/write handler functions. We provide
initialization macros to describe each GIC register later easily.

Separate dispatch functions for read and write accesses are connected
to the kvm_io_bus framework and binary-search for the responsible
register handler based on the offset address within the region.
We convert the incoming data (referenced by a pointer) to the host's
endianess and use pass-by-value to hand the data over to the actual
handler functions.

The register handler prototype and the endianess conversion are
courtesy of Christoffer Dall.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
Signed-off-by: Andre Przywara <[email protected]>
Reviewed-by: Christoffer Dall <[email protected]>
This commit is contained in:
Marc Zyngier 2016-04-26 11:06:12 +01:00 • committed by Christoffer Dall
commit 4493b1c486
3 changed files with 296 additions and 0 deletions
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13
include/kvm/vgic/vgic.h
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@ -106,6 +106,16 @@ struct vgic_irq {
enum vgic_irq_config config; /* Level or edge */
};
struct vgic_register_region;
struct vgic_io_device {
gpa_t base_addr;
struct kvm_vcpu *redist_vcpu;
const struct vgic_register_region *regions;
int nr_regions;
struct kvm_io_device dev;
};
struct vgic_dist {
bool in_kernel;
bool ready;
@ -132,6 +142,9 @@ struct vgic_dist {
bool enabled;
struct vgic_irq *spis;
struct vgic_io_device dist_iodev;
struct vgic_io_device *redist_iodevs;
};
struct vgic_v2_cpu_if {