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x86/xen: event channels delivery on HVM.

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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>
This commit is contained in:
Sheng Yang
2010-05-14 12:40:51 +01:00
committed by Jeremy Fitzhardinge
parent bee6ab53e6
commit 38e20b07ef
9 changed files with 119 additions and 8 deletions
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arch/x86/include/asm/irq_vectors.h
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@@ -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