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| author | Sheng Yang <sheng@linux.intel.com> | 2010-05-14 12:40:51 +0100 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-07-22 16:45:59 -0700 |
| commit | 38e20b07efd541a959de367dc90a17f92ce2e8a6 (patch) | |
| tree | bb087e243bf6e707dd063be2024a3b90de2f9413 /arch/x86/kernel/entry_64.S | |
| parent | bee6ab53e652a414af20392899879b58cd80d033 (diff) | |
| download | op-kernel-dev-38e20b07efd541a959de367dc90a17f92ce2e8a6.zip op-kernel-dev-38e20b07efd541a959de367dc90a17f92ce2e8a6.tar.gz | |
x86/xen: event channels delivery on HVM.
Set the callback to receive evtchns from Xen, using the
callback vector delivery mechanism.
The traditional way for receiving event channel notifications from Xen
is via the interrupts from the platform PCI device.
The callback vector is a newer alternative that allow us to receive
notifications on any vcpu and doesn't need any PCI support: we allocate
a vector exclusively to receive events, in the vector handler we don't
need to interact with the vlapic, therefore we avoid a VMEXIT.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/kernel/entry_64.S')
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 0697ff1..490ae2b 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1329,6 +1329,9 @@ ENTRY(xen_failsafe_callback) CFI_ENDPROC END(xen_failsafe_callback) +apicinterrupt XEN_HVM_EVTCHN_CALLBACK \ + xen_hvm_callback_vector xen_evtchn_do_upcall + #endif /* CONFIG_XEN */ /* |
