diff options
Diffstat (limited to 'Documentation/virtual/kvm/api.txt')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 299306db5d84..5237e1b2fd66 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2182,7 +2182,7 @@ after pausing the vcpu, but before it is resumed. 4.71 KVM_SIGNAL_MSI Capability: KVM_CAP_SIGNAL_MSI -Architectures: x86 +Architectures: x86 arm64 Type: vm ioctl Parameters: struct kvm_msi (in) Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error @@ -2195,10 +2195,18 @@ struct kvm_msi { __u32 address_hi; __u32 data; __u32 flags; - __u8 pad[16]; + __u32 devid; + __u8 pad[12]; }; -No flags are defined so far. The corresponding field must be 0. +flags: KVM_MSI_VALID_DEVID: devid contains a valid value +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 need 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. On x86, address_hi is ignored unless the KVM_CAP_X2APIC_API capability is enabled. If it is enabled, address_hi bits 31-8 provide bits 31-8 of the |