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KVM: arm-vgic: Support KVM_CREATE_DEVICE for VGIC

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Support creating the ARM VGIC device through the KVM_CREATE_DEVICE
ioctl, which can then later be leveraged to use the
KVM_{GET/SET}_DEVICE_ATTR, which is useful both for setting addresses in
a more generic API than the ARM-specific one and is useful for
save/restore of VGIC state.

Adds KVM_CAP_DEVICE_CTRL to ARM capabilities.

Note that we change the check for creating a VGIC from bailing out if
any VCPUs were created, to bailing out if any VCPUs were ever run.  This
is an important distinction that shouldn't break anything, but allows
creating the VGIC after the VCPUs have been created.

Acked-by: Marc Zyngier <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Christoffer Dall 2013-10-25 17:29:18 +01:00
commit 7330672bef
6 changed files with 79 additions and 2 deletions
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10
Documentation/virtual/kvm/devices/arm-vgic.txt Normal file
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ARM Virtual Generic Interrupt Controller (VGIC)
===============================================
Device types supported:
KVM_DEV_TYPE_ARM_VGIC_V2 ARM Generic Interrupt Controller v2.0
Only one VGIC instance may be instantiated through either this API or the
legacy KVM_CREATE_IRQCHIP api. The created VGIC will act as the VM interrupt
controller, requiring emulated user-space devices to inject interrupts to the
VGIC instead of directly to CPUs.