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authorAndrey Smetanin <asmetanin@virtuozzo.com>2015-11-10 13:36:35 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2015-11-25 17:24:22 +0100
commitdb3975717ac5e2c2761bae7b90c4f2e0abb5ef22 (patch)
tree4252bea2d4fafcd11b680a4ae77f8dd9731a705b /Documentation
parentkvm/x86: Hyper-V synthetic interrupt controller (diff)
downloadlinux-db3975717ac5e2c2761bae7b90c4f2e0abb5ef22.tar.xz
linux-db3975717ac5e2c2761bae7b90c4f2e0abb5ef22.zip
kvm/x86: Hyper-V kvm exit
A new vcpu exit is introduced to notify the userspace of the changes in Hyper-V SynIC configuration triggered by guest writing to the corresponding MSRs. Changes v4: * exit into userspace only if guest writes into SynIC MSR's Changes v3: * added KVM_EXIT_HYPERV types and structs notes into docs Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com> Reviewed-by: Roman Kagan <rkagan@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Gleb Natapov <gleb@kernel.org> CC: Paolo Bonzini <pbonzini@redhat.com> CC: Roman Kagan <rkagan@virtuozzo.com> CC: Denis V. Lunev <den@openvz.org> CC: qemu-devel@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/virtual/kvm/api.txt22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 88af84675af0..053f613fc9a9 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3337,6 +3337,28 @@ the userspace IOAPIC should process the EOI and retrigger the interrupt if
it is still asserted. Vector is the LAPIC interrupt vector for which the
EOI was received.
+ struct kvm_hyperv_exit {
+#define KVM_EXIT_HYPERV_SYNIC 1
+ __u32 type;
+ union {
+ struct {
+ __u32 msr;
+ __u64 control;
+ __u64 evt_page;
+ __u64 msg_page;
+ } synic;
+ } u;
+ };
+ /* KVM_EXIT_HYPERV */
+ struct kvm_hyperv_exit hyperv;
+Indicates that the VCPU exits into userspace to process some tasks
+related to Hyper-V emulation.
+Valid values for 'type' are:
+ KVM_EXIT_HYPERV_SYNIC -- synchronously notify user-space about
+Hyper-V SynIC state change. Notification is used to remap SynIC
+event/message pages and to enable/disable SynIC messages/events processing
+in userspace.
+
/* Fix the size of the union. */
char padding[256];
};