Subject: [RFC PATCH 00/45] KVM: arm/arm64: Rework virtual GIC emulation

From: [email-masked] (Vladimir Murzin)
Date: Wed, 30 Mar 2016 12:42:58 +0100

On 29/03/16 14:12, Vladimir Murzin wrote:
> Hi Andre,
> 
> On 25/03/16 02:04, Andre Przywara wrote:
>> Please have a look at the series, review it and give the code some
>> serious testing (and possibly debugging). All feedback is appreciated.
> 
> I see that with the new vgic implementation kvmtool starts throwing:
> 
> kvm [1273]: Unable to register VGICv3 redist MMIO regions
> 

It comes from kvm_io_bus_register_dev()

if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
	return -ENOSPC;

with bus->dev_count being 1000

[<ffffffc00009f93c>] kvm_io_bus_register_dev+0x130/0x148
[<ffffffc0000ad274>] kvm_vgic_register_mmio_region+0xac/0xdc
[<ffffffc0000ad4d4>] vgic_register_redist_regions+0xb8/0x158
[<ffffffc0000abb90>] vgic_v3_map_resources+0x5c/0xf0
[<ffffffc0000aae04>] kvm_vgic_map_resources+0x40/0x84
[<ffffffc0000a23d0>] kvm_arch_vcpu_ioctl_run+0x3f0/0x400
[<ffffffc00009d484>] kvm_vcpu_ioctl+0x2d4/0x6ec
[<ffffffc0001c4eec>] do_vfs_ioctl+0xb4/0x760
[<ffffffc0001c561c>] SyS_ioctl+0x84/0x98
[<ffffffc000085d30>] el0_svc_naked+0x24/0x28

Hope this helps...
Vladimir

> for --cpus 58 and above, where with the old vgic it is quite happy with
> up to 255 cpus.
> 
> Cheers
> Vladimir
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