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| author | Mukesh Rathor <mukesh.rathor@oracle.com> | 2013-12-11 21:36:51 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2014-01-06 16:44:15 +0100 |
| commit | 2771374d47220c7ec271281437625e9519505bb2 (patch) | |
| tree | 2f49ac39521a4aa45872ecd0568565bd625d59b1 /arch/x86/xen/irq.c | |
| parent | xen/pvh: Update E820 to work with PVH (v2) (diff) | |
| download | linux-2771374d47220c7ec271281437625e9519505bb2.tar.xz linux-2771374d47220c7ec271281437625e9519505bb2.zip | |
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.c | 5 |
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; } |