[RFC PATCH 44/45] KVM: arm/arm64: vgic-new: Add dummy MSI implementation

[Eric Auger]

On 03/31/2016 08:16 PM, Christoffer Dall wrote:
> On Fri, Mar 25, 2016 at 02:05:07AM +0000, Andre Przywara wrote:
>> Although we don't provide any virtual MSI functionality yet, we
>> need to implement the functions required by the KVM interface.
> 
> I don't feel like this commit text accurately describes what's happening
> in the code?
> 
> This seems to be about irqfds which work just fine on a GICv2m guest?

Yes those functions enable irqfd injection. gsi routing and msi routing
is not implemented yet.

Eric
> 
> Thanks,
> -Christoffer
> 
>>
>> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
>> ---
>>  virt/kvm/arm/vgic/vgic_irqfd.c | 51 ++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 51 insertions(+)
>>  create mode 100644 virt/kvm/arm/vgic/vgic_irqfd.c
>>
>> diff --git a/virt/kvm/arm/vgic/vgic_irqfd.c b/virt/kvm/arm/vgic/vgic_irqfd.c
>> new file mode 100644
>> index 0000000..3eee1bd
>> --- /dev/null
>> +++ b/virt/kvm/arm/vgic/vgic_irqfd.c
>> @@ -0,0 +1,51 @@
>> +/*
>> + * Copyright (C) 2015, 2016 ARM Ltd.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>> + */
>> +
>> +#include <linux/kvm.h>
>> +#include <linux/kvm_host.h>
>> +#include <trace/events/kvm.h>
>> +
>> +int kvm_irq_map_gsi(struct kvm *kvm,
>> +		    struct kvm_kernel_irq_routing_entry *entries,
>> +		    int gsi)
>> +{
>> +	return 0;
>> +}
>> +
>> +int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
>> +{
>> +	return pin;
>> +}
>> +
>> +int kvm_set_irq(struct kvm *kvm, int irq_source_id,
>> +		u32 irq, int level, bool line_status)
>> +{
>> +	unsigned int spi = irq + VGIC_NR_PRIVATE_IRQS;
>> +
>> +	trace_kvm_set_irq(irq, level, irq_source_id);
>> +
>> +	BUG_ON(!vgic_initialized(kvm));
>> +
>> +	return kvm_vgic_inject_irq(kvm, 0, spi, level);
>> +}
>> +
>> +/* MSI not implemented yet */
>> +int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
>> +		struct kvm *kvm, int irq_source_id,
>> +		int level, bool line_status)
>> +{
>> +	return 0;
>> +}
>> -- 
>> 2.7.3
>>