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authorMukesh Rathor <mukesh.rathor@oracle.com>2013-12-11 15:36:51 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-01-06 10:44:15 -0500
commit2771374d47220c7ec271281437625e9519505bb2 (patch)
tree2f49ac39521a4aa45872ecd0568565bd625d59b1 /arch/x86/xen/irq.c
parent9103bb0f8240b2a55aac3ff7ecba9c7dcf66b08b (diff)
downloadlinux-2771374d47220c7ec271281437625e9519505bb2.tar.bz2
xen/pvh: Piggyback on PVHVM for event channels (v2)
PVH is a PV guest with a twist - there are certain things that work in it like HVM and some like PV. There is a similar mode - PVHVM where we run in HVM mode with PV code enabled - and this patch explores that. The most notable PV interfaces are the XenBus and event channels. We will piggyback on how the event channel mechanism is used in PVHVM - that is we want the normal native IRQ mechanism and we will install a vector (hvm callback) for which we will call the event channel mechanism. This means that from a pvops perspective, we can use native_irq_ops instead of the Xen PV specific. Albeit in the future we could support pirq_eoi_map. But that is a feature request that can be shared with PVHVM. Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'arch/x86/xen/irq.c')
-rw-r--r--arch/x86/xen/irq.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index 0da7f863056f..76ca326105f7 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -5,6 +5,7 @@
#include <xen/interface/xen.h>
#include <xen/interface/sched.h>
#include <xen/interface/vcpu.h>
+#include <xen/features.h>
#include <xen/events.h>
#include <asm/xen/hypercall.h>
@@ -128,6 +129,8 @@ static const struct pv_irq_ops xen_irq_ops __initconst = {
void __init xen_init_irq_ops(void)
{
- pv_irq_ops = xen_irq_ops;
+ /* For PVH we use default pv_irq_ops settings. */
+ if (!xen_feature(XENFEAT_hvm_callback_vector))
+ pv_irq_ops = xen_irq_ops;
x86_init.irqs.intr_init = xen_init_IRQ;
}