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KVM: api: Pass the devid in the msi routing entry

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On ARM, the MSI msg (address and data) comes along with
out-of-band device ID information. The device ID encodes the
device that writes the MSI msg. Let's convey the device id in
kvm_irq_routing_msi and use KVM_MSI_VALID_DEVID flag value in
kvm_irq_routing_entry to indicate the msi devid is populated.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Eric Auger 2016-07-22 16:20:37 +00:00 committed by Marc Zyngier
parent 3a88bded20
commit 76a10b8678
2 changed files with 21 additions and 3 deletions
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17
Documentation/virtual/kvm/api.txt
View File

@ -1468,7 +1468,11 @@ struct kvm_irq_routing_entry {
#define KVM_IRQ_ROUTING_S390_ADAPTER 3
#define KVM_IRQ_ROUTING_HV_SINT 4
No flags are specified so far, the corresponding field must be set to zero.
flags:
- KVM_MSI_VALID_DEVID: used along with KVM_IRQ_ROUTING_MSI
routing entry type, specifies that the devid field contains
a valid value.
- zero otherwise
struct kvm_irq_routing_irqchip {
__u32 irqchip;
@ -1479,9 +1483,20 @@ struct kvm_irq_routing_msi {
__u32 address_lo;
__u32 address_hi;
__u32 data;
union {
__u32 pad;
__u32 devid;
};
};
devid: If KVM_MSI_VALID_DEVID is set, contains a unique device identifier
for the device that wrote the MSI message.
For PCI, this is usually a BFD identifier in the lower 16 bits.
The per-VM KVM_CAP_MSI_DEVID capability advertises the requirement to
provide the device ID. If this capability is not set, userland cannot
rely on the kernel to allow the KVM_MSI_VALID_DEVID flag being set.
struct kvm_irq_routing_s390_adapter {
__u64 ind_addr;
__u64 summary_addr;

3
include/uapi/linux/kvm.h
View File

@ -879,7 +879,10 @@ struct kvm_irq_routing_msi {
__u32 address_lo;
__u32 address_hi;
__u32 data;
union {
__u32 pad;
__u32 devid;
};
};
struct kvm_irq_routing_s390_adapter {