Implement PV IPIs for PVHVM guests and further converge PV and HVM

IPI implmementations.

Submitted by: Roger Pau Monné
Sponsored by: Citrix Systems R&D
Submitted by: gibbs (misc cleanup, table driven config)
Reviewed by:  gibbs
MFC after: 2 weeks

sys/amd64/include/cpufunc.h:
sys/amd64/amd64/pmap.c:
	Move invltlb_globpcid() into cpufunc.h so that it can be
	used by the Xen HVM version of tlb shootdown IPI handlers.

sys/x86/xen/xen_intr.c:
sys/xen/xen_intr.h:
	Rename xen_intr_bind_ipi() to xen_intr_alloc_and_bind_ipi(),
	and remove the ipi vector parameter.  This api allocates
	an event channel port that can be used for ipi services,
	but knows nothing of the actual ipi for which that port
	will be used.  Removing the unused argument and cleaning
	up the comments surrounding its declaration helps clarify
	its actual role.

sys/amd64/amd64/mp_machdep.c:
sys/amd64/include/cpu.h:
sys/i386/i386/mp_machdep.c:
sys/i386/include/cpu.h:
	Implement a generic framework for amd64 and i386 that allows
	the implementation of certain CPU management functions to
	be selected at runtime.  Currently this is only used for
	the ipi send function, which we optimize for Xen when running
	on a Xen hypervisor, but can easily be expanded to support
	more operations.

sys/x86/xen/hvm.c:
	Implement Xen PV IPI handlers and operations, replacing native
	send IPI.

sys/amd64/include/pcpu.h:
sys/i386/include/pcpu.h:
sys/i386/include/smp.h:
	Remove NR_VIRQS and NR_IPIS from FreeBSD headers.  NR_VIRQS
	is defined already for us in the xen interface files.
	NR_IPIS is only needed in one file per Xen platform and is
	easily inferred by the IPI vector table that is defined in
	those files.

sys/i386/xen/mp_machdep.c:
	Restructure to more closely match the HVM implementation by
	performing table driven IPI setup.

1 files changed, 5 insertions, 6 deletions

diff --git a/sys/xen/xen_intr.h b/sys/xen/xen_intr.h
index 109608f..3b339a5 100644
--- a/sys/xen/xen_intr.h
+++ b/sys/xen/xen_intr.h
@@ -141,21 +141,20 @@ int xen_intr_bind_virq(device_t dev, u_int virq, u_int cpu,
 	void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep);
 
 /**
- * Associate an interprocessor interrupt vector with an interrupt handler.
+ * Allocate a local event channel port for servicing interprocessor
+ * interupts and, if successful, associate the port with the specified
+ * interrupt handler.
  *
  * \param dev       The device making this bind request.
- * \param ipi       The interprocessor interrupt vector number of the
- *                  interrupt source being hooked.
  * \param cpu       The cpu receiving the IPI.
- * \param filter    An interrupt filter handler.  Specify NULL
- *                  to always dispatch to the ithread handler.
+ * \param filter    The interrupt filter servicing this IPI.
  * \param irqflags  Interrupt handler flags.  See sys/bus.h.
  * \param handlep   Pointer to an opaque handle used to manage this
  *                  registration.
  *
  * \returns  0 on success, otherwise an errno.
  */
-int xen_intr_bind_ipi(device_t dev, u_int ipi, u_int cpu,
+int xen_intr_alloc_and_bind_ipi(device_t dev, u_int cpu,
 	driver_filter_t filter, enum intr_type irqflags,
 	xen_intr_handle_t *handlep);