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authorPavel Fedin <p.fedin@samsung.com>2015-12-18 14:38:43 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2015-12-18 12:01:58 +0000
commitc7da6fa43cb1c5e649da0f478a491feb9208cae7 (patch)
treee3c01e8cba0407717be707a71f7e952454cba706 /virt/kvm
parent1b1ebe820fcb446146dfb2d04a1f0b7905645f75 (diff)
arm/arm64: KVM: Detect vGIC presence at runtime
Before commit 662d9715840aef44dcb573b0f9fab9e8319c868a ("arm/arm64: KVM: Kill CONFIG_KVM_ARM_{VGIC,TIMER}") is was possible to compile the kernel without vGIC and vTimer support. Commit message says about possibility to detect vGIC support in runtime, but this has never been implemented. This patch introduces runtime check, restoring the lost functionality. It again allows to use KVM on hardware without vGIC. Interrupt controller has to be emulated in userspace in this case. -ENODEV return code from probe function means there's no GIC at all. -ENXIO happens when, for example, there is GIC node in the device tree, but it does not specify vGIC resources. Any other error code is still treated as full stop because it might mean some really serious problems. Signed-off-by: Pavel Fedin <p.fedin@samsung.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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