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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/include/asm/irq_vectors.h | |
| parent | x86: early PV on HVM features initialization. (diff) | |
| download | linux-dev-38e20b07efd541a959de367dc90a17f92ce2e8a6.tar.xz linux-dev-38e20b07efd541a959de367dc90a17f92ce2e8a6.zip | |
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/include/asm/irq_vectors.h')
| -rw-r--r-- | arch/x86/include/asm/irq_vectors.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h index 8767d99c4f64..e2ca30092557 100644 --- a/arch/x86/include/asm/irq_vectors.h +++ b/arch/x86/include/asm/irq_vectors.h @@ -125,6 +125,9 @@ */ #define MCE_SELF_VECTOR 0xeb +/* Xen vector callback to receive events in a HVM domain */ +#define XEN_HVM_EVTCHN_CALLBACK 0xe9 + #define NR_VECTORS 256 #define FPU_IRQ 13 |