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authorMukesh Rathor <mukesh.rathor@oracle.com>2013-12-12 00:36:51 +0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-01-06 19:44:15 +0400
commit2771374d47220c7ec271281437625e9519505bb2 (patch)
tree2f49ac39521a4aa45872ecd0568565bd625d59b1 /drivers/xen/events
parent9103bb0f8240b2a55aac3ff7ecba9c7dcf66b08b (diff)
downloadlinux-2771374d47220c7ec271281437625e9519505bb2.tar.xz
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 'drivers/xen/events')
-rw-r--r--drivers/xen/events/events_base.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 1d16185e82b2..4672e003c0ad 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1685,8 +1685,15 @@ void __init xen_init_IRQ(void)
pirq_needs_eoi = pirq_needs_eoi_flag;
#ifdef CONFIG_X86
- if (xen_hvm_domain()) {
+ if (xen_pv_domain()) {
+ irq_ctx_init(smp_processor_id());
+ if (xen_initial_domain())
+ pci_xen_initial_domain();
+ }
+ if (xen_feature(XENFEAT_hvm_callback_vector))
xen_callback_vector();
+
+ if (xen_hvm_domain()) {
native_init_IRQ();
/* pci_xen_hvm_init must be called after native_init_IRQ so that
* __acpi_register_gsi can point at the right function */
@@ -1695,13 +1702,10 @@ void __init xen_init_IRQ(void)
int rc;
struct physdev_pirq_eoi_gmfn eoi_gmfn;
- irq_ctx_init(smp_processor_id());
- if (xen_initial_domain())
- pci_xen_initial_domain();
-
pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
+ /* TODO: No PVH support for PIRQ EOI */
if (rc != 0) {
free_page((unsigned long) pirq_eoi_map);
pirq_eoi_map = NULL;