Hi,
On 03/05/16 10:59, Marc Zyngier wrote:
> On 28/04/16 17:46, Andre Przywara wrote:
>> From: Eric Auger <eric.auger@xxxxxxxxxx>
>>
>> This patch implements the switches for KVM_DEV_ARM_VGIC_GRP_DIST_REGS
>> and KVM_DEV_ARM_VGIC_GRP_CPU_REGS API which allows the userspace to
>> access VGIC registers.
>>
>> At that stage the interfaces with the MMIO API are not implemented:
>> - vgic_attr_regs_access
>> - vgic_v2_has_attr_regs
>>
>> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
>> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
>> ---
>> virt/kvm/arm/vgic/vgic-kvm-device.c | 53 +++++++++++++++++++++++++++++++++++--
>> virt/kvm/arm/vgic/vgic-mmio-v2.c | 34 ++++++++++++++++++++++++
>> virt/kvm/arm/vgic/vgic.h | 1 +
>> 3 files changed, 86 insertions(+), 2 deletions(-)
>>
>
> [...]
>
>> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
>> index ae6077e..f2a8efe 100644
>> --- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
>> +++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
>> @@ -276,3 +276,37 @@ int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
>>
>> return ret;
>> }
>> +
>> +int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
>> +{
>> + int nr_irqs = dev->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
>> + const struct vgic_register_region *regions;
>> + gpa_t addr;
>> + int nr_regions, i, len;
>> +
>> + addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
>> +
>> + switch (attr->group) {
>> + case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
>> + regions = vgic_v2_dist_registers;
>> + nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
>> + break;
>> + case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
>> + return -ENXIO; /* TODO: describe CPU i/f regs also */
>
> This definitely needs addressing, as it breaks guest migration.
It is implemented in patch 46/54.
Shall I remove the TODO to avoid confusion and/or replace it with a note
either in a comment or in this commit message that the implementation
will follow in one the next patches?
Cheers,
Andre.
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