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| author | Eric Auger <eric.auger@redhat.com> | 2016-07-22 18:20:37 +0200 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-07-22 19:51:49 +0200 |
| commit | 76a10b86785c5e3fc49bcee355502d035b07e47a (patch) | |
| tree | e7f27dfa1b3c6c79a60eab55040be1745ce71903 /Documentation | |
| parent | KVM: arm64: vgic-its: Simplify MAPI error handling (diff) | |
| download | linux-76a10b86785c5e3fc49bcee355502d035b07e47a.tar.xz linux-76a10b86785c5e3fc49bcee355502d035b07e47a.zip | |
KVM: api: Pass the devid in the msi routing entry
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 07049eadb124..415cde1647e9 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -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; - __u32 pad; + 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; |