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| author | Sascha Bischoff <Sascha.Bischoff@arm.com> | 2026-03-19 15:58:01 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2026-03-19 18:21:29 +0000 |
| commit | 7c31c06e2d2d75859d773ba940e56d1db2bd1fcd (patch) | |
| tree | e2e63d0ee9011f96f3cc0303ef0d6b269bd30b4c /Documentation/virt | |
| parent | 9491c63b6cd7bdae97cd29c7c6bf400adbd3578f (diff) | |
| download | lwn-7c31c06e2d2d75859d773ba940e56d1db2bd1fcd.tar.gz lwn-7c31c06e2d2d75859d773ba940e56d1db2bd1fcd.zip | |
KVM: arm64: gic-v5: Mandate architected PPI for PMU emulation on GICv5
Make it mandatory to use the architected PPI when running a GICv5
guest. Attempts to set anything other than the architected PPI (23)
are rejected.
Additionally, KVM_ARM_VCPU_PMU_V3_INIT is relaxed to no longer require
KVM_ARM_VCPU_PMU_V3_IRQ to be called for GICv5-based guests. In this
case, the architectued PPI is automatically used.
Documentation is bumped accordingly.
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://patch.msgid.link/20260319154937.3619520-33-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/devices/vcpu.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/virt/kvm/devices/vcpu.rst b/Documentation/virt/kvm/devices/vcpu.rst index 60bf205cb373..5e3805820010 100644 --- a/Documentation/virt/kvm/devices/vcpu.rst +++ b/Documentation/virt/kvm/devices/vcpu.rst @@ -37,7 +37,8 @@ Returns: 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 type must be same for each vcpu. As a PPI, the interrupt number is the same for -all vcpus, while as an SPI it must be a separate number per vcpu. +all vcpus, while as an SPI it must be a separate number per vcpu. For +GICv5-based guests, the architected PPI (23) must be used. 1.2 ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_INIT --------------------------------------- @@ -50,7 +51,7 @@ Returns: -EEXIST Interrupt number already used -ENODEV PMUv3 not supported or GIC not initialized -ENXIO PMUv3 not supported, missing VCPU feature or interrupt - number not set + number not set (non-GICv5 guests, only) -EBUSY PMUv3 already initialized ======= ====================================================== |