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KVM: arm64: Add undocumented return values for PMU device control group

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KVM_ARM_VCPU_PMU_V3_IRQ returns -EFAULT if get_user() fails when reading
the interrupt number from kvm_device_attr.addr.

KVM_ARM_VCPU_PMU_V3_INIT returns the error value from kvm_vgic_set_owner().
kvm_arm_pmu_v3_init() checks that the vgic has been initialized and the
interrupt number is valid, but kvm_vgic_set_owner() can still return the
error code -EEXIST if another device has already claimed the interrupt.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Link: https://lore.kernel.org/r/20200924123731.268177-2-alexandru.elisei@arm.com
This commit is contained in:
Alexandru Elisei 2020-09-24 13:37:30 +01:00 committed by Marc Zyngier
parent 8be86a5eec
commit af130d0adc
1 changed files with 2 additions and 0 deletions
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2
Documentation/virt/kvm/devices/vcpu.rst
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@ -25,6 +25,7 @@ Returns:
======= ========================================================
-EBUSY The PMU overflow interrupt is already set
-EFAULT Error reading interrupt number
-ENXIO The overflow interrupt not set when attempting to get it
-ENODEV PMUv3 not supported
-EINVAL Invalid PMU overflow interrupt number supplied or
@ -45,6 +46,7 @@ all vcpus, while as an SPI it must be a separate number per vcpu.
Returns:
======= ======================================================
-EEXIST Interrupt number already used
-ENODEV PMUv3 not supported or GIC not initialized
-ENXIO PMUv3 not properly configured or in-kernel irqchip not
configured as required prior to calling this attribute