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authorSteve Rutherford <srutherford@google.com>2015-07-29 23:21:40 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2015-10-01 15:06:26 +0200
commit49df6397edfc5a8ba8ca813b51fb9729d8e94b40 (patch)
treeb5cb29a28fff01c9c85c4f02961164532fa241b2 /Documentation/virtual
parent4ca7dd8ce4b24e18f94eed90e80c6eb80fb48c9a (diff)
downloadop-kernel-dev-49df6397edfc5a8ba8ca813b51fb9729d8e94b40.zip
op-kernel-dev-49df6397edfc5a8ba8ca813b51fb9729d8e94b40.tar.gz
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')
-rw-r--r--Documentation/virtual/kvm/api.txt17
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index d9eccee..43e0816 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.
----------------------
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