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| author | Christoffer Dall <cdall@linaro.org> | 2017-05-02 14:41:02 +0300 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-06-08 17:59:44 +0300 |
| commit | a2befacf50940017e0de8461c4b924a929c4edc5 (patch) | |
| tree | aa53d740e25468b943b0d89d0b51cd3a35d9ca75 /Documentation/virtual | |
| parent | 1b6502e5bc5ef16179bcd812dfa43d8bbb5689d4 (diff) | |
| download | linux-a2befacf50940017e0de8461c4b924a929c4edc5.tar.xz | |
KVM: arm64: Allow creating the PMU without the in-kernel GIC
Since we got support for devices in userspace which allows reporting the
PMU overflow output status to userspace, we should actually allow
creating the PMU on systems without an in-kernel irqchip, which in turn
requires us to slightly clarify error codes for the ABI and move things
around for the initialization phase.
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/devices/vcpu.txt | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/Documentation/virtual/kvm/devices/vcpu.txt b/Documentation/virtual/kvm/devices/vcpu.txt index 02f50686c418..d7236a3e01dc 100644 --- a/Documentation/virtual/kvm/devices/vcpu.txt +++ b/Documentation/virtual/kvm/devices/vcpu.txt @@ -16,7 +16,9 @@ Parameters: in kvm_device_attr.addr the address for PMU overflow interrupt is a Returns: -EBUSY: The PMU overflow interrupt is already set -ENXIO: The overflow interrupt not set when attempting to get it -ENODEV: PMUv3 not supported - -EINVAL: Invalid PMU overflow interrupt number supplied + -EINVAL: Invalid PMU overflow interrupt number supplied or + trying to set the IRQ number without using an in-kernel + irqchip. A value describing the PMUv3 (Performance Monitor Unit v3) overflow interrupt number for this vcpu. This interrupt could be a PPI or SPI, but the interrupt @@ -25,11 +27,11 @@ all vcpus, while as an SPI it must be a separate number per vcpu. 1.2 ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_INIT Parameters: no additional parameter in kvm_device_attr.addr -Returns: -ENODEV: PMUv3 not supported - -ENXIO: PMUv3 not properly configured as required prior to calling this - attribute +Returns: -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 -EBUSY: PMUv3 already initialized -Request the initialization of the PMUv3. This must be done after creating the -in-kernel irqchip. Creating a PMU with a userspace irqchip is currently not -supported. +Request the initialization of the PMUv3. If using the PMUv3 with an in-kernel +virtual GIC implementation, this must be done after initializing the in-kernel +irqchip. |