diff options
| author | Steve Rutherford | 2015-07-29 23:21:40 -0700 |
|---|---|---|
| committer | Paolo Bonzini | 2015-10-01 15:06:26 +0200 |
| commit | 49df6397edfc5a8ba8ca813b51fb9729d8e94b40 (patch) | |
| tree | b5cb29a28fff01c9c85c4f02961164532fa241b2 /Documentation/virtual/kvm | |
| parent | 4ca7dd8ce4b24e18f94eed90e80c6eb80fb48c9a (diff) | |
KVM: x86: Split the APIC from the rest of IRQCHIP.
First patch in a series which enables the relocation of the
PIC/IOAPIC to userspace.
Adds capability KVM_CAP_SPLIT_IRQCHIP;
KVM_CAP_SPLIT_IRQCHIP enables the construction of LAPICs without the
rest of the irqchip.
Compile tested for x86.
Signed-off-by: Steve Rutherford <srutherford@google.com>
Suggested-by: Andrew Honig <ahonig@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virtual/kvm')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index d9ecceea5a02..43e0816d0de1 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -3627,6 +3627,23 @@ struct { KVM handlers should exit to userspace with rc = -EREMOTE. +7.5 KVM_CAP_SPLIT_IRQCHIP + +Architectures: x86 +Parameters: None +Returns: 0 on success, -1 on error + +Create a local apic for each processor in the kernel. This can be used +instead of KVM_CREATE_IRQCHIP if the userspace VMM wishes to emulate the +IOAPIC and PIC (and also the PIT, even though this has to be enabled +separately). + +This supersedes KVM_CREATE_IRQCHIP, creating only local APICs, but no in kernel +IOAPIC or PIC. This also enables in kernel routing of interrupt requests. + +Fails if VCPU has already been created, or if the irqchip is already in the +kernel (i.e. KVM_CREATE_IRQCHIP has already been called). + 8. Other capabilities. ---------------------- |