Pull pvops into release branch

16 files changed, 960 insertions, 303 deletions

diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index e67ee3f..905d25b 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -100,3 +100,9 @@ define archhelp
   echo '  boot		- Build vmlinux and bootloader for Ski simulator'
   echo '* unwcheck	- Check vmlinux for invalid unwind info'
 endef
+
+archprepare: make_nr_irqs_h FORCE
+PHONY += make_nr_irqs_h FORCE
+
+make_nr_irqs_h: FORCE
+	$(Q)$(MAKE) $(build)=arch/ia64/kernel include/asm-ia64/nr-irqs.h
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 13fd10e..87fea11 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -36,6 +36,8 @@ obj-$(CONFIG_PCI_MSI)		+= msi_ia64.o
 mca_recovery-y			+= mca_drv.o mca_drv_asm.o
 obj-$(CONFIG_IA64_MC_ERR_INJECT)+= err_inject.o
 
+obj-$(CONFIG_PARAVIRT)		+= paravirt.o paravirtentry.o
+
 obj-$(CONFIG_IA64_ESI)		+= esi.o
 ifneq ($(CONFIG_IA64_ESI),)
 obj-y				+= esi_stub.o	# must be in kernel proper
@@ -70,3 +72,45 @@ $(obj)/gate-syms.o: $(obj)/gate.lds $(obj)/gate.o FORCE
 # We must build gate.so before we can assemble it.
 # Note: kbuild does not track this dependency due to usage of .incbin
 $(obj)/gate-data.o: $(obj)/gate.so
+
+# Calculate NR_IRQ = max(IA64_NATIVE_NR_IRQS, XEN_NR_IRQS, ...) based on config
+define sed-y
+	"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
+endef
+quiet_cmd_nr_irqs = GEN     $@
+define cmd_nr_irqs
+	(set -e; \
+	 echo "#ifndef __ASM_NR_IRQS_H__"; \
+	 echo "#define __ASM_NR_IRQS_H__"; \
+	 echo "/*"; \
+	 echo " * DO NOT MODIFY."; \
+	 echo " *"; \
+	 echo " * This file was generated by Kbuild"; \
+	 echo " *"; \
+	 echo " */"; \
+	 echo ""; \
+	 sed -ne $(sed-y) $<; \
+	 echo ""; \
+	 echo "#endif" ) > $@
+endef
+
+# We use internal kbuild rules to avoid the "is up to date" message from make
+arch/$(SRCARCH)/kernel/nr-irqs.s: $(srctree)/arch/$(SRCARCH)/kernel/nr-irqs.c \
+				$(wildcard $(srctree)/include/asm-ia64/*/irq.h)
+	$(Q)mkdir -p $(dir $@)
+	$(call if_changed_dep,cc_s_c)
+
+include/asm-ia64/nr-irqs.h: arch/$(SRCARCH)/kernel/nr-irqs.s
+	$(Q)mkdir -p $(dir $@)
+	$(call cmd,nr_irqs)
+
+clean-files += $(objtree)/include/asm-ia64/nr-irqs.h
+
+#
+# native ivt.S and entry.S
+#
+ASM_PARAVIRT_OBJS = ivt.o entry.o
+define paravirtualized_native
+AFLAGS_$(1) += -D__IA64_ASM_PARAVIRTUALIZED_NATIVE
+endef
+$(foreach obj,$(ASM_PARAVIRT_OBJS),$(eval $(call paravirtualized_native,$(obj))))
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index ca2bb95..56ab156 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -23,6 +23,11 @@
  * 11/07/2000
  */
 /*
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *                    pv_ops.
+ */
+/*
  * Global (preserved) predicate usage on syscall entry/exit path:
  *
  *	pKStk:		See entry.h.
@@ -45,6 +50,7 @@
 
 #include "minstate.h"
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 	/*
 	 * execve() is special because in case of success, we need to
 	 * setup a null register window frame.
@@ -173,6 +179,7 @@ GLOBAL_ENTRY(sys_clone)
 	mov rp=loc0
 	br.ret.sptk.many rp
 END(sys_clone)
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
 
 /*
  * prev_task <- ia64_switch_to(struct task_struct *next)
@@ -180,7 +187,7 @@ END(sys_clone)
  *	called.  The code starting at .map relies on this.  The rest of the code
  *	doesn't care about the interrupt masking status.
  */
-GLOBAL_ENTRY(ia64_switch_to)
+GLOBAL_ENTRY(__paravirt_switch_to)
 	.prologue
 	alloc r16=ar.pfs,1,0,0,0
 	DO_SAVE_SWITCH_STACK
@@ -204,7 +211,7 @@ GLOBAL_ENTRY(ia64_switch_to)
 	;;
 .done:
 	ld8 sp=[r21]			// load kernel stack pointer of new task
-	mov IA64_KR(CURRENT)=in0	// update "current" application register
+	MOV_TO_KR(CURRENT, in0, r8, r9)		// update "current" application register
 	mov r8=r13			// return pointer to previously running task
 	mov r13=in0			// set "current" pointer
 	;;
@@ -216,26 +223,25 @@ GLOBAL_ENTRY(ia64_switch_to)
 	br.ret.sptk.many rp		// boogie on out in new context
 
 .map:
-	rsm psr.ic			// interrupts (psr.i) are already disabled here
+	RSM_PSR_IC(r25)			// interrupts (psr.i) are already disabled here
 	movl r25=PAGE_KERNEL
 	;;
 	srlz.d
 	or r23=r25,r20			// construct PA | page properties
 	mov r25=IA64_GRANULE_SHIFT<<2
 	;;
-	mov cr.itir=r25
-	mov cr.ifa=in0			// VA of next task...
+	MOV_TO_ITIR(p0, r25, r8)
+	MOV_TO_IFA(in0, r8)		// VA of next task...
 	;;
 	mov r25=IA64_TR_CURRENT_STACK
-	mov IA64_KR(CURRENT_STACK)=r26	// remember last page we mapped...
+	MOV_TO_KR(CURRENT_STACK, r26, r8, r9)	// remember last page we mapped...
 	;;
 	itr.d dtr[r25]=r23		// wire in new mapping...
-	ssm psr.ic			// reenable the psr.ic bit
-	;;
-	srlz.d
+	SSM_PSR_IC_AND_SRLZ_D(r8, r9)	// reenable the psr.ic bit
 	br.cond.sptk .done
-END(ia64_switch_to)
+END(__paravirt_switch_to)
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 /*
  * Note that interrupts are enabled during save_switch_stack and load_switch_stack.  This
  * means that we may get an interrupt with "sp" pointing to the new kernel stack while
@@ -375,7 +381,7 @@ END(save_switch_stack)
  *	- b7 holds address to return to
  *	- must not touch r8-r11
  */
-ENTRY(load_switch_stack)
+GLOBAL_ENTRY(load_switch_stack)
 	.prologue
 	.altrp b7
 
@@ -571,7 +577,7 @@ GLOBAL_ENTRY(ia64_trace_syscall)
 .ret3:
 (pUStk)	cmp.eq.unc p6,p0=r0,r0			// p6 <- pUStk
 (pUStk)	rsm psr.i				// disable interrupts
-	br.cond.sptk .work_pending_syscall_end
+	br.cond.sptk ia64_work_pending_syscall_end
 
 strace_error:
 	ld8 r3=[r2]				// load pt_regs.r8
@@ -636,8 +642,17 @@ GLOBAL_ENTRY(ia64_ret_from_syscall)
 	adds r2=PT(R8)+16,sp			// r2 = &pt_regs.r8
 	mov r10=r0				// clear error indication in r10
 (p7)	br.cond.spnt handle_syscall_error	// handle potential syscall failure
+#ifdef CONFIG_PARAVIRT
+	;;
+	br.cond.sptk.few ia64_leave_syscall
+	;;
+#endif /* CONFIG_PARAVIRT */
 END(ia64_ret_from_syscall)
+#ifndef CONFIG_PARAVIRT
 	// fall through
+#endif
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
+
 /*
  * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
  *	need to switch to bank 0 and doesn't restore the scratch registers.
@@ -682,7 +697,7 @@ END(ia64_ret_from_syscall)
  *	      ar.csd: cleared
  *	      ar.ssd: cleared
  */
-ENTRY(ia64_leave_syscall)
+GLOBAL_ENTRY(__paravirt_leave_syscall)
 	PT_REGS_UNWIND_INFO(0)
 	/*
 	 * work.need_resched etc. mustn't get changed by this CPU before it returns to
@@ -692,11 +707,11 @@ ENTRY(ia64_leave_syscall)
 	 * extra work.  We always check for extra work when returning to user-level.
 	 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
 	 * is 0.  After extra work processing has been completed, execution
-	 * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
+	 * resumes at ia64_work_processed_syscall with p6 set to 1 if the extra-work-check
 	 * needs to be redone.
 	 */
 #ifdef CONFIG_PREEMPT
-	rsm psr.i				// disable interrupts
+	RSM_PSR_I(p0, r2, r18)			// disable interrupts
 	cmp.eq pLvSys,p0=r0,r0			// pLvSys=1: leave from syscall
 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
 	;;
@@ -706,11 +721,12 @@ ENTRY(ia64_leave_syscall)
 	;;
 	cmp.eq p6,p0=r21,r0		// p6 <- pUStk || (preempt_count == 0)
 #else /* !CONFIG_PREEMPT */
-(pUStk)	rsm psr.i
+	RSM_PSR_I(pUStk, r2, r18)
 	cmp.eq pLvSys,p0=r0,r0		// pLvSys=1: leave from syscall
 (pUStk)	cmp.eq.unc p6,p0=r0,r0		// p6 <- pUStk
 #endif
-.work_processed_syscall:
+.global __paravirt_work_processed_syscall;
+__paravirt_work_processed_syscall:
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 	adds r2=PT(LOADRS)+16,r12
 (pUStk)	mov.m r22=ar.itc			// fetch time at leave
@@ -744,7 +760,7 @@ ENTRY(ia64_leave_syscall)
 (pNonSys) break 0		//      bug check: we shouldn't be here if pNonSys is TRUE!
 	;;
 	invala			// M0|1 invalidate ALAT
-	rsm psr.i | psr.ic	// M2   turn off interrupts and interruption collection
+	RSM_PSR_I_IC(r28, r29, r30)	// M2   turn off interrupts and interruption collection
 	cmp.eq p9,p0=r0,r0	// A    set p9 to indicate that we should restore cr.ifs
 
 	ld8 r29=[r2],16		// M0|1 load cr.ipsr
@@ -765,7 +781,7 @@ ENTRY(ia64_leave_syscall)
 	;;
 #endif
 	ld8 r26=[r2],PT(B0)-PT(AR_PFS)	// M0|1 load ar.pfs
-(pKStk)	mov r22=psr			// M2   read PSR now that interrupts are disabled
+	MOV_FROM_PSR(pKStk, r22, r21)	// M2   read PSR now that interrupts are disabled
 	nop 0
 	;;
 	ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
@@ -798,7 +814,7 @@ ENTRY(ia64_leave_syscall)
 
 	srlz.d				// M0   ensure interruption collection is off (for cover)
 	shr.u r18=r19,16		// I0|1 get byte size of existing "dirty" partition
-	cover				// B    add current frame into dirty partition & set cr.ifs
+	COVER				// B    add current frame into dirty partition & set cr.ifs
 	;;
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 	mov r19=ar.bsp			// M2   get new backing store pointer
@@ -823,8 +839,9 @@ ENTRY(ia64_leave_syscall)
 	mov.m ar.ssd=r0			// M2   clear ar.ssd
 	mov f11=f0			// F    clear f11
 	br.cond.sptk.many rbs_switch	// B
-END(ia64_leave_syscall)
+END(__paravirt_leave_syscall)
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 #ifdef CONFIG_IA32_SUPPORT
 GLOBAL_ENTRY(ia64_ret_from_ia32_execve)
 	PT_REGS_UNWIND_INFO(0)
@@ -835,10 +852,20 @@ GLOBAL_ENTRY(ia64_ret_from_ia32_execve)
 	st8.spill [r2]=r8	// store return value in slot for r8 and set unat bit
 	.mem.offset 8,0
 	st8.spill [r3]=r0	// clear error indication in slot for r10 and set unat bit
+#ifdef CONFIG_PARAVIRT
+	;;
+	// don't fall through, ia64_leave_kernel may be #define'd
+	br.cond.sptk.few ia64_leave_kernel
+	;;
+#endif /* CONFIG_PARAVIRT */
 END(ia64_ret_from_ia32_execve)
+#ifndef CONFIG_PARAVIRT
 	// fall through
+#endif
 #endif /* CONFIG_IA32_SUPPORT */
-GLOBAL_ENTRY(ia64_leave_kernel)
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
+
+GLOBAL_ENTRY(__paravirt_leave_kernel)
 	PT_REGS_UNWIND_INFO(0)
 	/*
 	 * work.need_resched etc. mustn't get changed by this CPU before it returns to
@@ -852,7 +879,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 	 * needs to be redone.
 	 */
 #ifdef CONFIG_PREEMPT
-	rsm psr.i				// disable interrupts
+	RSM_PSR_I(p0, r17, r31)			// disable interrupts
 	cmp.eq p0,pLvSys=r0,r0			// pLvSys=0: leave from kernel
 (pKStk)	adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
 	;;
@@ -862,7 +889,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 	;;
 	cmp.eq p6,p0=r21,r0		// p6 <- pUStk || (preempt_count == 0)
 #else
-(pUStk)	rsm psr.i
+	RSM_PSR_I(pUStk, r17, r31)
 	cmp.eq p0,pLvSys=r0,r0		// pLvSys=0: leave from kernel
 (pUStk)	cmp.eq.unc p6,p0=r0,r0		// p6 <- pUStk
 #endif
@@ -910,7 +937,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 	mov ar.csd=r30
 	mov ar.ssd=r31
 	;;
-	rsm psr.i | psr.ic	// initiate turning off of interrupt and interruption collection
+	RSM_PSR_I_IC(r23, r22, r25)	// initiate turning off of interrupt and interruption collection
 	invala			// invalidate ALAT
 	;;
 	ld8.fill r22=[r2],24
@@ -942,7 +969,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 	mov ar.ccv=r15
 	;;
 	ldf.fill f11=[r2]
-	bsw.0			// switch back to bank 0 (no stop bit required beforehand...)
+	BSW_0(r2, r3, r15)	// switch back to bank 0 (no stop bit required beforehand...)
 	;;
 (pUStk)	mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency)
 	adds r16=PT(CR_IPSR)+16,r12
@@ -950,12 +977,12 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 	.pred.rel.mutex pUStk,pKStk
-(pKStk)	mov r22=psr		// M2 read PSR now that interrupts are disabled
+	MOV_FROM_PSR(pKStk, r22, r29)	// M2 read PSR now that interrupts are disabled
 (pUStk)	mov.m r22=ar.itc	// M  fetch time at leave
 	nop.i 0
 	;;
 #else
-(pKStk)	mov r22=psr		// M2 read PSR now that interrupts are disabled
+	MOV_FROM_PSR(pKStk, r22, r29)	// M2 read PSR now that interrupts are disabled
 	nop.i 0
 	nop.i 0
 	;;
@@ -1027,7 +1054,7 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 	 * NOTE: alloc, loadrs, and cover can't be predicated.
 	 */
 (pNonSys) br.cond.dpnt dont_preserve_current_frame
-	cover				// add current frame into dirty partition and set cr.ifs
+	COVER				// add current frame into dirty partition and set cr.ifs
 	;;
 	mov r19=ar.bsp			// get new backing store pointer
 rbs_switch:
@@ -1130,16 +1157,16 @@ skip_rbs_switch:
 (pKStk)	dep r29=r22,r29,21,1	// I0 update ipsr.pp with psr.pp
 (pLvSys)mov r16=r0		// A  clear r16 for leave_syscall, no-op otherwise
 	;;
-	mov cr.ipsr=r29		// M2
+	MOV_TO_IPSR(p0, r29, r25)	// M2
 	mov ar.pfs=r26		// I0
 (pLvSys)mov r17=r0		// A  clear r17 for leave_syscall, no-op otherwise
 
-(p9)	mov cr.ifs=r30		// M2
+	MOV_TO_IFS(p9, r30, r25)// M2
 	mov b0=r21		// I0
 (pLvSys)mov r18=r0		// A  clear r18 for leave_syscall, no-op otherwise
 
 	mov ar.fpsr=r20		// M2
-	mov cr.iip=r28		// M2
+	MOV_TO_IIP(r28, r25)	// M2
 	nop 0
 	;;
 (pUStk)	mov ar.rnat=r24		// M2 must happen with RSE in lazy mode
@@ -1148,7 +1175,7 @@ skip_rbs_switch:
 
 	mov ar.rsc=r27		// M2
 	mov pr=r31,-1		// I0
-	rfi			// B
+	RFI			// B
 
 	/*
 	 * On entry:
@@ -1174,35 +1201,36 @@ skip_rbs_switch:
 	;;
 (pKStk) st4 [r20]=r21
 #endif
-	ssm psr.i		// enable interrupts
+	SSM_PSR_I(p0, p6, r2)	// enable interrupts
 	br.call.spnt.many rp=schedule
 .ret9:	cmp.eq p6,p0=r0,r0	// p6 <- 1 (re-check)
-	rsm psr.i		// disable interrupts
+	RSM_PSR_I(p0, r2, r20)	// disable interrupts
 	;;
 #ifdef CONFIG_PREEMPT
 (pKStk)	adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
 	;;
 (pKStk)	st4 [r20]=r0		// preempt_count() <- 0
 #endif
-(pLvSys)br.cond.sptk.few  .work_pending_syscall_end
+(pLvSys)br.cond.sptk.few  __paravirt_pending_syscall_end
 	br.cond.sptk.many .work_processed_kernel
 
 .notify:
 (pUStk)	br.call.spnt.many rp=notify_resume_user
 .ret10:	cmp.ne p6,p0=r0,r0	// p6 <- 0 (don't re-check)
-(pLvSys)br.cond.sptk.few  .work_pending_syscall_end
+(pLvSys)br.cond.sptk.few  __paravirt_pending_syscall_end
 	br.cond.sptk.many .work_processed_kernel
 
-.work_pending_syscall_end:
+.global __paravirt_pending_syscall_end;
+__paravirt_pending_syscall_end:
 	adds r2=PT(R8)+16,r12
 	adds r3=PT(R10)+16,r12
 	;;
 	ld8 r8=[r2]
 	ld8 r10=[r3]
-	br.cond.sptk.many .work_processed_syscall
-
-END(ia64_leave_kernel)
+	br.cond.sptk.many __paravirt_work_processed_syscall_target
+END(__paravirt_leave_kernel)
 
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 ENTRY(handle_syscall_error)
 	/*
 	 * Some system calls (e.g., ptrace, mmap) can return arbitrary values which could
@@ -1244,7 +1272,7 @@ END(ia64_invoke_schedule_tail)
 	 * We declare 8 input registers so the system call args get preserved,
 	 * in case we need to restart a system call.
 	 */
-ENTRY(notify_resume_user)
+GLOBAL_ENTRY(notify_resume_user)
 	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
 	alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
 	mov r9=ar.unat
@@ -1306,7 +1334,7 @@ ENTRY(sys_rt_sigreturn)
 	adds sp=16,sp
 	;;
 	ld8 r9=[sp]				// load new ar.unat
-	mov.sptk b7=r8,ia64_leave_kernel
+	mov.sptk b7=r8,ia64_native_leave_kernel
 	;;
 	mov ar.unat=r9
 	br.many b7
@@ -1665,3 +1693,4 @@ sys_call_table:
 	data8 sys_timerfd_gettime
 
 	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index ddeab4e..db540e5 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -26,11 +26,14 @@
 #include <asm/mmu_context.h>
 #include <asm/asm-offsets.h>
 #include <asm/pal.h>
+#include <asm/paravirt.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 #include <asm/ptrace.h>
 #include <asm/system.h>
 #include <asm/mca_asm.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
 
 #ifdef CONFIG_HOTPLUG_CPU
 #define SAL_PSR_BITS_TO_SET				\
@@ -367,6 +370,44 @@ start_ap:
 	;;
 (isBP)	st8 [r2]=r28		// save the address of the boot param area passed by the bootloader
 
+#ifdef CONFIG_PARAVIRT
+
+	movl r14=hypervisor_setup_hooks
+	movl r15=hypervisor_type
+	mov r16=num_hypervisor_hooks
+	;;
+	ld8 r2=[r15]
+	;;
+	cmp.ltu p7,p0=r2,r16	// array size check
+	shladd r8=r2,3,r14
+	;;
+(p7)	ld8 r9=[r8]
+	;;
+(p7)	mov b1=r9
+(p7)	cmp.ne.unc p7,p0=r9,r0	// no actual branch to NULL
+	;;
+(p7)	br.call.sptk.many rp=b1
+
+	__INITDATA
+
+default_setup_hook = 0		// Currently nothing needs to be done.
+
+	.weak xen_setup_hook
+
+	.global hypervisor_type
+hypervisor_type:
+	data8		PARAVIRT_HYPERVISOR_TYPE_DEFAULT
+
+	// must have the same order with PARAVIRT_HYPERVISOR_TYPE_xxx
+
+hypervisor_setup_hooks:
+	data8		default_setup_hook
+	data8		xen_setup_hook
+num_hypervisor_hooks = (. - hypervisor_setup_hooks) / 8
+	.previous
+
+#endif
+
 #ifdef CONFIG_SMP
 (isAP)	br.call.sptk.many rp=start_secondary
 .ret0:
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index 39752cd..3bc2fa6 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -585,6 +585,15 @@ static inline int irq_is_shared (int irq)
 	return (iosapic_intr_info[irq].count > 1);
 }
 
+struct irq_chip*
+ia64_native_iosapic_get_irq_chip(unsigned long trigger)
+{
+	if (trigger == IOSAPIC_EDGE)
+		return &irq_type_iosapic_edge;
+	else
+		return &irq_type_iosapic_level;
+}
+
 static int
 register_intr (unsigned int gsi, int irq, unsigned char delivery,
 	       unsigned long polarity, unsigned long trigger)
@@ -635,13 +644,10 @@ register_intr (unsigned int gsi, int irq, unsigned char delivery,
 	iosapic_intr_info[irq].dmode    = delivery;
 	iosapic_intr_info[irq].trigger  = trigger;
 
-	if (trigger == IOSAPIC_EDGE)
-		irq_type = &irq_type_iosapic_edge;
-	else
-		irq_type = &irq_type_iosapic_level;
+	irq_type = iosapic_get_irq_chip(trigger);
 
 	idesc = irq_desc + irq;
-	if (idesc->chip != irq_type) {
+	if (irq_type != NULL && idesc->chip != irq_type) {
 		if (idesc->chip != &no_irq_type)
 			printk(KERN_WARNING
 			       "%s: changing vector %d from %s to %s\n",
@@ -974,6 +980,22 @@ iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
 }
 
 void __init
+ia64_native_iosapic_pcat_compat_init(void)
+{
+	if (pcat_compat) {
+		/*
+		 * Disable the compatibility mode interrupts (8259 style),
+		 * needs IN/OUT support enabled.
+		 */
+		printk(KERN_INFO
+		       "%s: Disabling PC-AT compatible 8259 interrupts\n",
+		       __func__);
+		outb(0xff, 0xA1);
+		outb(0xff, 0x21);
+	}
+}
+
+void __init
 iosapic_system_init (int system_pcat_compat)
 {
 	int irq;
@@ -987,17 +1009,8 @@ iosapic_system_init (int system_pcat_compat)
 	}
 
 	pcat_compat = system_pcat_compat;
-	if (pcat_compat) {
-		/*
-		 * Disable the compatibility mode interrupts (8259 style),
-		 * needs IN/OUT support enabled.
-		 */
-		printk(KERN_INFO
-		       "%s: Disabling PC-AT compatible 8259 interrupts\n",
-		       __func__);
-		outb(0xff, 0xA1);
-		outb(0xff, 0x21);
-	}
+	if (pcat_compat)
+		iosapic_pcat_compat_init();
 }
 
 static inline int
diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
index 5538471..28d3d48 100644
--- a/arch/ia64/kernel/irq_ia64.c
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -196,7 +196,7 @@ static void clear_irq_vector(int irq)
 }
 
 int
-assign_irq_vector (int irq)
+ia64_native_assign_irq_vector (int irq)
 {
 	unsigned long flags;
 	int vector, cpu;
@@ -222,7 +222,7 @@ assign_irq_vector (int irq)
 }
 
 void
-free_irq_vector (int vector)
+ia64_native_free_irq_vector (int vector)
 {
 	if (vector < IA64_FIRST_DEVICE_VECTOR ||
 	    vector > IA64_LAST_DEVICE_VECTOR)
@@ -600,7 +600,6 @@ static irqreturn_t dummy_handler (int irq, void *dev_id)
 {
 	BUG();
 }
-extern irqreturn_t handle_IPI (int irq, void *dev_id);
 
 static struct irqaction ipi_irqaction = {
 	.handler =	handle_IPI,
@@ -623,7 +622,7 @@ static struct irqaction tlb_irqaction = {
 #endif
 
 void
-register_percpu_irq (ia64_vector vec, struct irqaction *action)
+ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action)
 {
 	irq_desc_t *desc;
 	unsigned int irq;
@@ -638,13 +637,21 @@ register_percpu_irq (ia64_vector vec, struct irqaction *action)
 }
 
 void __init
-init_IRQ (void)
+ia64_native_register_ipi(void)
 {
-	register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
 #ifdef CONFIG_SMP
 	register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
 	register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
 	register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
+#endif
+}
+
+void __init
+init_IRQ (void)
+{
+	ia64_register_ipi();
+	register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
+#ifdef CONFIG_SMP
 #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG)
 	if (vector_domain_type != VECTOR_DOMAIN_NONE) {
 		BUG_ON(IA64_FIRST_DEVICE_VECTOR != IA64_IRQ_MOVE_VECTOR);
diff --git a/arch/ia64/kernel/ivt.S b/arch/ia64/kernel/ivt.S
index 80b44ea..c39627d 100644
--- a/arch/ia64/kernel/ivt.S
+++ b/arch/ia64/kernel/ivt.S
@@ -12,6 +12,14 @@
  *
  * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
  * 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *	Dan Magenheimer <dan.magenheimer@hp.com>
+ *      Xen paravirtualization
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *                    pv_ops.
+ *      Yaozu (Eddie) Dong <eddie.dong@intel.com>
  */
 /*
  * This file defines the interruption vector table used by the CPU.
@@ -102,13 +110,13 @@ ENTRY(vhpt_miss)
 	 *	- the faulting virtual address uses unimplemented address bits
 	 *	- the faulting virtual address has no valid page table mapping
 	 */
-	mov r16=cr.ifa				// get address that caused the TLB miss
+	MOV_FROM_IFA(r16)			// get address that caused the TLB miss
 #ifdef CONFIG_HUGETLB_PAGE
 	movl r18=PAGE_SHIFT
-	mov r25=cr.itir
+	MOV_FROM_ITIR(r25)
 #endif
 	;;
-	rsm psr.dt				// use physical addressing for data
+	RSM_PSR_DT				// use physical addressing for data
 	mov r31=pr				// save the predicate registers
 	mov r19=IA64_KR(PT_BASE)		// get page table base address
 	shl r21=r16,3				// shift bit 60 into sign bit
@@ -168,21 +176,21 @@ ENTRY(vhpt_miss)
 	dep r21=r19,r20,3,(PAGE_SHIFT-3)	// r21=pte_offset(pmd,addr)
 	;;
 (p7)	ld8 r18=[r21]				// read *pte
-	mov r19=cr.isr				// cr.isr bit 32 tells us if this is an insn miss
+	MOV_FROM_ISR(r19)			// cr.isr bit 32 tells us if this is an insn miss
 	;;
 (p7)	tbit.z p6,p7=r18,_PAGE_P_BIT		// page present bit cleared?
-	mov r22=cr.iha				// get the VHPT address that caused the TLB miss
+	MOV_FROM_IHA(r22)			// get the VHPT address that caused the TLB miss
 	;;					// avoid RAW on p7
 (p7)	tbit.nz.unc p10,p11=r19,32		// is it an instruction TLB miss?
 	dep r23=0,r20,0,PAGE_SHIFT		// clear low bits to get page address
 	;;
-(p10)	itc.i r18				// insert the instruction TLB entry
-(p11)	itc.d r18				// insert the data TLB entry
+	ITC_I_AND_D(p10, p11, r18, r24)		// insert the instruction TLB entry and
+						// insert the data TLB entry
 (p6)	br.cond.spnt.many page_fault		// handle bad address/page not present (page fault)
-	mov cr.ifa=r22
+	MOV_TO_IFA(r22, r24)
 
 #ifdef CONFIG_HUGETLB_PAGE
-(p8)	mov cr.itir=r25				// change to default page-size for VHPT
+	MOV_TO_ITIR(p8, r25, r24)		// change to default page-size for VHPT
 #endif
 
 	/*
@@ -192,7 +200,7 @@ ENTRY(vhpt_miss)
 	 */
 	adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
 	;;
-(p7)	itc.d r24
+	ITC_D(p7, r24, r25)
 	;;
 #ifdef CONFIG_SMP
 	/*
@@ -234,7 +242,7 @@ ENTRY(vhpt_miss)
 #endif
 
 	mov pr=r31,-1				// restore predicate registers
-	rfi
+	RFI
 END(vhpt_miss)
 
 	.org ia64_ivt+0x400
@@ -248,11 +256,11 @@ ENTRY(itlb_miss)
 	 * mode, walk the page table, and then re-execute the PTE read and
 	 * go on normally after that.
 	 */
-	mov r16=cr.ifa				// get virtual address
+	MOV_FROM_IFA(r16)			// get virtual address
 	mov r29=b0				// save b0
 	mov r31=pr				// save predicates
 .itlb_fault:
-	mov r17=cr.iha				// get virtual address of PTE
+	MOV_FROM_IHA(r17)			// get virtual address of PTE
 	movl r30=1f				// load nested fault continuation point
 	;;
 1:	ld8 r18=[r17]				// read *pte
@@ -261,7 +269,7 @@ ENTRY(itlb_miss)
 	tbit.z p6,p0=r18,_PAGE_P_BIT		// page present bit cleared?
 (p6)	br.cond.spnt page_fault
 	;;
-	itc.i r18
+	ITC_I(p0, r18, r19)
 	;;
 #ifdef CONFIG_SMP
 	/*
@@ -278,7 +286,7 @@ ENTRY(itlb_miss)
 (p7)	ptc.l r16,r20
 #endif
 	mov pr=r31,-1
-	rfi
+	RFI
 END(itlb_miss)
 
 	.org ia64_ivt+0x0800
@@ -292,11 +300,11 @@ ENTRY(dtlb_miss)
 	 * mode, walk the page table, and then re-execute the PTE read and
 	 * go on normally after that.
 	 */
-	mov r16=cr.ifa				// get virtual address
+	MOV_FROM_IFA(r16)			// get virtual address
 	mov r29=b0				// save b0
 	mov r31=pr				// save predicates
 dtlb_fault:
-	mov r17=cr.iha				// get virtual address of PTE
+	MOV_FROM_IHA(r17)			// get virtual address of PTE
 	movl r30=1f				// load nested fault continuation point
 	;;
 1:	ld8 r18=[r17]				// read *pte
@@ -305,7 +313,7 @@ dtlb_fault:
 	tbit.z p6,p0=r18,_PAGE_P_BIT		// page present bit cleared?
 (p6)	br.cond.spnt page_fault
 	;;
-	itc.d r18
+	ITC_D(p0, r18, r19)
 	;;
 #ifdef CONFIG_SMP
 	/*
@@ -322,7 +330,7 @@ dtlb_fault:
 (p7)	ptc.l r16,r20
 #endif
 	mov pr=r31,-1
-	rfi
+	RFI
 END(dtlb_miss)
 
 	.org ia64_ivt+0x0c00
@@ -330,9 +338,9 @@ END(dtlb_miss)
 // 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
 ENTRY(alt_itlb_miss)
 	DBG_FAULT(3)
-	mov r16=cr.ifa		// get address that caused the TLB miss
+	MOV_FROM_IFA(r16)	// get address that caused the TLB miss
 	movl r17=PAGE_KERNEL
-	mov r21=cr.ipsr
+	MOV_FROM_IPSR(p0, r21)
 	movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
 	mov r31=pr
 	;;
@@ -341,9 +349,9 @@ ENTRY(alt_itlb_miss)
 	;;
 	cmp.gt p8,p0=6,r22			// user mode
 	;;
-(p8)	thash r17=r16
+	THASH(p8, r17, r16, r23)
 	;;
-(p8)	mov cr.iha=r17
+	MOV_TO_IHA(p8, r17, r23)
 (p8)	mov r29=b0				// save b0
 (p8)	br.cond.dptk .itlb_fault
 #endif
@@ -358,9 +366,9 @@ ENTRY(alt_itlb_miss)
 	or r19=r19,r18		// set bit 4 (uncached) if the access was to region 6
 (p8)	br.cond.spnt page_fault
 	;;
-	itc.i r19		// insert the TLB entry
+	ITC_I(p0, r19, r18)	// insert the TLB entry
 	mov pr=r31,-1
-	rfi
+	RFI
 END(alt_itlb_miss)
 
 	.org ia64_ivt+0x1000
@@ -368,11 +376,11 @@ END(alt_itlb_miss)
 // 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
 ENTRY(alt_dtlb_miss)
 	DBG_FAULT(4)
-	mov r16=cr.ifa		// get address that caused the TLB miss
+	MOV_FROM_IFA(r16)	// get address that caused the TLB miss
 	movl r17=PAGE_KERNEL
-	mov r20=cr.isr
+	MOV_FROM_ISR(r20)
 	movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
-	mov r21=cr.ipsr
+	MOV_FROM_IPSR(p0, r21)
 	mov r31=pr
 	mov r24=PERCPU_ADDR
 	;;
@@ -381,9 +389,9 @@ ENTRY(alt_dtlb_miss)
 	;;
 	cmp.gt p8,p0=6,r22			// access to region 0-5
 	;;
-(p8)	thash r17=r16
+	THASH(p8, r17, r16, r25)
 	;;
-(p8)	mov cr.iha=r17
+	MOV_TO_IHA(p8, r17, r25)
 (p8)	mov r29=b0				// save b0
 (p8)	br.cond.dptk dtlb_fault
 #endif
@@ -402,7 +410,7 @@ ENTRY(alt_dtlb_miss)
 	tbit.nz p9,p0=r20,IA64_ISR_NA_BIT	// is non-access bit on?
 	;;
 (p10)	sub r19=r19,r26
-(p10)	mov cr.itir=r25
+	MOV_TO_ITIR(p10, r25, r24)
 	cmp.ne p8,p0=r0,r23
 (p9)	cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22	// check isr.code field
 (p12)	dep r17=-1,r17,4,1			// set ma=UC for region 6 addr
@@ -411,11 +419,11 @@ ENTRY(alt_dtlb_miss)
 	dep r21=-1,r21,IA64_PSR_ED_BIT,1
 	;;
 	or r19=r19,r17		// insert PTE control bits into r19
-(p6)	mov cr.ipsr=r21
+	MOV_TO_IPSR(p6, r21, r24)
 	;;
-(p7)	itc.d r19		// insert the TLB entry
+	ITC_D(p7, r19, r18)	// insert the TLB entry
 	mov pr=r31,-1
-	rfi
+	RFI
 END(alt_dtlb_miss)
 
 	.org ia64_ivt+0x1400
@@ -444,10 +452,10 @@ ENTRY(nested_dtlb_miss)
 	 *
 	 * Clobbered:	b0, r18, r19, r21, r22, psr.dt (cleared)
 	 */
-	rsm psr.dt				// switch to using physical data addressing
+	RSM_PSR_DT				// switch to using physical data addressing
 	mov r19=IA64_KR(PT_BASE)		// get the page table base address
 	shl r21=r16,3				// shift bit 60 into sign bit
-	mov r18=cr.itir
+	MOV_FROM_ITIR(r18)
 	;;
 	shr.u r17=r16,61			// get the region number into r17
 	extr.u r18=r18,2,6			// get the faulting page size
@@ -507,33 +515,6 @@ ENTRY(ikey_miss)
 	FAULT(6)
 END(ikey_miss)
 
-	//-----------------------------------------------------------------------------------
-	// call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
-ENTRY(page_fault)
-	ssm psr.dt
-	;;
-	srlz.i
-	;;
-	SAVE_MIN_WITH_COVER
-	alloc r15=ar.pfs,0,0,3,0
-	mov out0=cr.ifa
-	mov out1=cr.isr
-	adds r3=8,r2				// set up second base pointer
-	;;
-	ssm psr.ic | PSR_DEFAULT_BITS
-	;;
-	srlz.i					// guarantee that interruption collectin is on
-	;;
-(p15)	ssm psr.i				// restore psr.i
-	movl r14=ia64_leave_kernel
-	;;
-	SAVE_REST
-	mov rp=r14
-	;;
-	adds out2=16,r12			// out2 = pointer to pt_regs
-	br.call.sptk.many b6=ia64_do_page_fault	// ignore return address
-END(page_fault)
-
 	.org ia64_ivt+0x1c00
 /////////////////////////////////////////////////////////////////////////////////////////
 // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
@@ -556,10 +537,10 @@ ENTRY(dirty_bit)
 	 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
 	 * up the physical address of the L3 PTE and then continue at label 1 below.
 	 */
-	mov r16=cr.ifa				// get the address that caused the fault
+	MOV_FROM_IFA(r16)			// get the address that caused the fault
 	movl r30=1f				// load continuation point in case of nested fault
 	;;
-	thash r17=r16				// compute virtual address of L3 PTE
+	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
 	mov r29=b0				// save b0 in case of nested fault
 	mov r31=pr				// save pr
 #ifdef CONFIG_SMP
@@ -576,7 +557,7 @@ ENTRY(dirty_bit)
 	;;
 (p6)	cmp.eq p6,p7=r26,r18			// Only compare if page is present
 	;;
-(p6)	itc.d r25				// install updated PTE
+	ITC_D(p6, r25, r18)			// install updated PTE
 	;;
 	/*
 	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
@@ -602,7 +583,7 @@ ENTRY(dirty_bit)
 	itc.d r18				// install updated PTE
 #endif
 	mov pr=r31,-1				// restore pr
-	rfi
+	RFI
 END(dirty_bit)
 
 	.org ia64_ivt+0x2400
@@ -611,22 +592,22 @@ END(dirty_bit)
 ENTRY(iaccess_bit)
 	DBG_FAULT(9)
 	// Like Entry 8, except for instruction access
-	mov r16=cr.ifa				// get the address that caused the fault
+	MOV_FROM_IFA(r16)			// get the address that caused the fault
 	movl r30=1f				// load continuation point in case of nested fault
 	mov r31=pr				// save predicates
 #ifdef CONFIG_ITANIUM
 	/*
 	 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
 	 */
-	mov r17=cr.ipsr
+	MOV_FROM_IPSR(p0, r17)
 	;;
-	mov r18=cr.iip
+	MOV_FROM_IIP(r18)
 	tbit.z p6,p0=r17,IA64_PSR_IS_BIT	// IA64 instruction set?
 	;;
 (p6)	mov r16=r18				// if so, use cr.iip instead of cr.ifa
 #endif /* CONFIG_ITANIUM */
 	;;
-	thash r17=r16				// compute virtual address of L3 PTE
+	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
 	mov r29=b0				// save b0 in case of nested fault)
 #ifdef CONFIG_SMP
 	mov r28=ar.ccv				// save ar.ccv
@@ -642,7 +623,7 @@ ENTRY(iaccess_bit)
 	;;
 (p6)	cmp.eq p6,p7=r26,r18			// Only if page present
 	;;
-(p6)	itc.i r25				// install updated PTE
+	ITC_I(p6, r25, r26)			// install updated PTE
 	;;
 	/*
 	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
@@ -668,7 +649,7 @@ ENTRY(iaccess_bit)
 	itc.i r18				// install updated PTE
 #endif /* !CONFIG_SMP */
 	mov pr=r31,-1
-	rfi
+	RFI
 END(iaccess_bit)
 
 	.org ia64_ivt+0x2800
@@ -677,10 +658,10 @@ END(iaccess_bit)
 ENTRY(daccess_bit)
 	DBG_FAULT(10)
 	// Like Entry 8, except for data access
-	mov r16=cr.ifa				// get the address that caused the fault
+	MOV_FROM_IFA(r16)			// get the address that caused the fault
 	movl r30=1f				// load continuation point in case of nested fault
 	;;
-	thash r17=r16				// compute virtual address of L3 PTE
+	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
 	mov r31=pr
 	mov r29=b0				// save b0 in case of nested fault)
 #ifdef CONFIG_SMP
@@ -697,7 +678,7 @@ ENTRY(daccess_bit)
 	;;
 (p6)	cmp.eq p6,p7=r26,r18			// Only if page is present
 	;;
-(p6)	itc.d r25				// install updated PTE
+	ITC_D(p6, r25, r26)			// install updated PTE
 	/*
 	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
 	 * cannot possibly affect the following loads:
@@ -721,7 +702,7 @@ ENTRY(daccess_bit)
 #endif
 	mov b0=r29				// restore b0
 	mov pr=r31,-1
-	rfi
+	RFI
 END(daccess_bit)
 
 	.org ia64_ivt+0x2c00
@@ -745,10 +726,10 @@ ENTRY(break_fault)
 	 */
 	DBG_FAULT(11)
 	mov.m r16=IA64_KR(CURRENT)		// M2 r16 <- current task (12 cyc)
-	mov r29=cr.ipsr				// M2 (12 cyc)
+	MOV_FROM_IPSR(p0, r29)			// M2 (12 cyc)
 	mov r31=pr				// I0 (2 cyc)
 
-	mov r17=cr.iim				// M2 (2 cyc)
+	MOV_FROM_IIM(r17)			// M2 (2 cyc)
 	mov.m r27=ar.rsc			// M2 (12 cyc)
 	mov r18=__IA64_BREAK_SYSCALL		// A
 
@@ -767,7 +748,7 @@ ENTRY(break_fault)
 	nop.m 0
 	movl r30=sys_call_table			// X
 
-	mov r28=cr.iip				// M2 (2 cyc)
+	MOV_FROM_IIP(r28)			// M2 (2 cyc)
 	cmp.eq p0,p7=r18,r17			// I0 is this a system call?
 (p7)	br.cond.spnt non_syscall		// B  no ->
 	//
@@ -864,18 +845,17 @@ ENTRY(break_fault)
 #endif
 	mov ar.rsc=0x3				// M2   set eager mode, pl 0, LE, loadrs=0
 	nop 0
-	bsw.1					// B (6 cyc) regs are saved, switch to bank 1
+	BSW_1(r2, r14)				// B (6 cyc) regs are saved, switch to bank 1
 	;;
 
-	ssm psr.ic | PSR_DEFAULT_BITS		// M2	now it's safe to re-enable intr.-collection
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r16)	// M2	now it's safe to re-enable intr.-collection
+						// M0   ensure interruption collection is on
 	movl r3=ia64_ret_from_syscall		// X
 	;;
-
-	srlz.i					// M0   ensure interruption collection is on
 	mov rp=r3				// I0   set the real return addr
 (p10)	br.cond.spnt.many ia64_ret_from_syscall	// B    return if bad call-frame or r15 is a NaT
 
-(p15)	ssm psr.i				// M2   restore psr.i
+	SSM_PSR_I(p15, p15, r16)		// M2   restore psr.i
 (p14)	br.call.sptk.many b6=b6			// B    invoke syscall-handker (ignore return addr)
 	br.cond.spnt.many ia64_trace_syscall	// B	do syscall-tracing thingamagic
 	// NOT REACHED
@@ -895,27 +875,8 @@ END(break_fault)
 /////////////////////////////////////////////////////////////////////////////////////////
 // 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
 ENTRY(interrupt)
-	DBG_FAULT(12)
-	mov r31=pr		// prepare to save predicates
-	;;
-	SAVE_MIN_WITH_COVER	// uses r31; defines r2 and r3
-	ssm psr.ic | PSR_DEFAULT_BITS
-	;;
-	adds r3=8,r2		// set up second base pointer for SAVE_REST
-	srlz.i			// ensure everybody knows psr.ic is back on
-	;;
-	SAVE_REST
-	;;
-	MCA_RECOVER_RANGE(interrupt)
-	alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
-	mov out0=cr.ivr		// pass cr.ivr as first arg
-	add out1=16,sp		// pass pointer to pt_regs as second arg
-	;;
-	srlz.d			// make sure we see the effect of cr.ivr
-	movl r14=ia64_leave_kernel
-	;;
-	mov rp=r14
-	br.call.sptk.many b6=ia64_handle_irq
+	/* interrupt handler has become too big to fit this area. */
+	br.sptk.many __interrupt
 END(interrupt)
 
 	.org ia64_ivt+0x3400
@@ -978,6 +939,7 @@ END(interrupt)
 	 *	- ar.fpsr: set to kernel settings
 	 *	-  b6: preserved (same as on entry)
 	 */
+#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
 GLOBAL_ENTRY(ia64_syscall_setup)
 #if PT(B6) != 0
 # error This code assumes that b6 is the first field in pt_regs.
@@ -1069,6 +1031,7 @@ GLOBAL_ENTRY(ia64_syscall_setup)
 (p10)	mov r8=-EINVAL
 	br.ret.sptk.many b7
 END(ia64_syscall_setup)
+#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
 
 	.org ia64_ivt+0x3c00
 /////////////////////////////////////////////////////////////////////////////////////////
@@ -1082,7 +1045,7 @@ END(ia64_syscall_setup)
 	DBG_FAULT(16)
 	FAULT(16)
 
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+#if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(__IA64_ASM_PARAVIRTUALIZED_NATIVE)
 	/*
 	 * There is no particular reason for this code to be here, other than
 	 * that there happens to be space here that would go unused otherwise.
@@ -1092,7 +1055,7 @@ END(ia64_syscall_setup)
 	 * account_sys_enter is called from SAVE_MIN* macros if accounting is
 	 * enabled and if the macro is entered from user mode.
 	 */
-ENTRY(account_sys_enter)
+GLOBAL_ENTRY(account_sys_enter)
 	// mov.m r20=ar.itc is called in advance, and r13 is current
 	add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13
 	add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13
@@ -1123,110 +1086,18 @@ END(account_sys_enter)
 	DBG_FAULT(17)
 	FAULT(17)
 
-ENTRY(non_syscall)
-	mov ar.rsc=r27			// restore ar.rsc before SAVE_MIN_WITH_COVER
-	;;
-	SAVE_MIN_WITH_COVER
-
-	// There is no particular reason for this code to be here, other than that
-	// there happens to be space here that would go unused otherwise.  If this
-	// fault ever gets "unreserved", simply moved the following code to a more
-	// suitable spot...
-
-	alloc r14=ar.pfs,0,0,2,0
-	mov out0=cr.iim
-	add out1=16,sp
-	adds r3=8,r2			// set up second base pointer for SAVE_REST
-
-	ssm psr.ic | PSR_DEFAULT_BITS
-	;;
-	srlz.i				// guarantee that interruption collection is on
-	;;
-(p15)	ssm psr.i			// restore psr.i
-	movl r15=ia64_leave_kernel
-	;;
-	SAVE_REST
-	mov rp=r15
-	;;
-	br.call.sptk.many b6=ia64_bad_break	// avoid WAW on CFM and ignore return addr
-END(non_syscall)
-
 	.org ia64_ivt+0x4800
 /////////////////////////////////////////////////////////////////////////////////////////
 // 0x4800 Entry 18 (size 64 bundles) Reserved
 	DBG_FAULT(18)
 	FAULT(18)
 
-	/*
-	 * There is no particular reason for this code to be here, other than that
-	 * there happens to be space here that would go unused otherwise.  If this
-	 * fault ever gets "unreserved", simply moved the following code to a more
-	 * suitable spot...
-	 */
-
-ENTRY(dispatch_unaligned_handler)
-	SAVE_MIN_WITH_COVER
-	;;
-	alloc r14=ar.pfs,0,0,2,0		// now it's safe (must be first in insn group!)
-	mov out0=cr.ifa
-	adds out1=16,sp
-
-	ssm psr.ic | PSR_DEFAULT_BITS
-	;;
-	srlz.i					// guarantee that interruption collection is on
-	;;
-(p15)	ssm psr.i				// restore psr.i
-	adds r3=8,r2				// set up second base pointer
-	;;
-	SAVE_REST
-	movl r14=ia64_leave_kernel
-	;;
-	mov rp=r14
-	br.sptk.many ia64_prepare_handle_unaligned
-END(dispatch_unaligned_handler)
-
 	.org ia64_ivt+0x4c00
 /////////////////////////////////////////////////////////////////////////////////////////
 // 0x4c00 Entry 19 (size 64 bundles) Reserved
 	DBG_FAULT(19)
 	FAULT(19)
 
-	/*
-	 * There is no particular reason for this code to be here, other than that
-	 * there happens to be space here that would go unused otherwise.  If this
-	 * fault ever gets "unreserved", simply moved the following code to a more
-	 * suitable spot...
-	 */
-
-ENTRY(dispatch_to_fault_handler)
-	/*
-	 * Input:
-	 *	psr.ic:	off
-	 *	r19:	fault vector number (e.g., 24 for General Exception)
-	 *	r31:	contains saved predicates (pr)
-	 */
-	SAVE_MIN_WITH_COVER_R19
-	alloc r14=ar.pfs,0,0,5,0
-	mov out0=r15
-	mov out1=cr.isr
-	mov out2=cr.ifa
-	mov out3=cr.iim
-	mov out4=cr.itir
-	;;
-	ssm psr.ic | PSR_DEFAULT_BITS
-	;;
-	srlz.i					// guarantee that interruption collection is on
-	;;
-(p15)	ssm psr.i				// restore psr.i
-	adds r3=8,r2				// set up second base pointer for SAVE_REST
-	;;
-	SAVE_REST
-	movl r14=ia64_leave_kernel
-	;;
-	mov rp=r14
-	br.call.sptk.many b6=ia64_fault
-END(dispatch_to_fault_handler)
-
 //
 // --- End of long entries, Beginning of short entries
 //
@@ -1236,8 +1107,8 @@ END(dispatch_to_fault_handler)
 // 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
 ENTRY(page_not_present)
 	DBG_FAULT(20)
-	mov r16=cr.ifa
-	rsm psr.dt
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
 	/*
 	 * The Linux page fault handler doesn't expect non-present pages to be in
 	 * the TLB.  Flush the existing entry now, so we meet that expectation.
@@ -1256,8 +1127,8 @@ END(page_not_present)
 // 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
 ENTRY(key_permission)
 	DBG_FAULT(21)
-	mov r16=cr.ifa
-	rsm psr.dt
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
 	mov r31=pr
 	;;
 	srlz.d
@@ -1269,8 +1140,8 @@ END(key_permission)
 // 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
 ENTRY(iaccess_rights)
 	DBG_FAULT(22)
-	mov r16=cr.ifa
-	rsm psr.dt
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
 	mov r31=pr
 	;;
 	srlz.d
@@ -1282,8 +1153,8 @@ END(iaccess_rights)
 // 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
 ENTRY(daccess_rights)
 	DBG_FAULT(23)
-	mov r16=cr.ifa
-	rsm psr.dt
+	MOV_FROM_IFA(r16)
+	RSM_PSR_DT
 	mov r31=pr
 	;;
 	srlz.d
@@ -1295,7 +1166,7 @@ END(daccess_rights)
 // 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
 ENTRY(general_exception)
 	DBG_FAULT(24)
-	mov r16=cr.isr
+	MOV_FROM_ISR(r16)
 	mov r31=pr
 	;;
 	cmp4.eq p6,p0=0,r16
@@ -1324,8 +1195,8 @@ END(disabled_fp_reg)
 ENTRY(nat_consumption)
 	DBG_FAULT(26)
 
-	mov r16=cr.ipsr
-	mov r17=cr.isr
+	MOV_FROM_IPSR(p0, r16)
+	MOV_FROM_ISR(r17)
 	mov r31=pr				// save PR
 	;;
 	and r18=0xf,r17				// r18 = cr.ipsr.code{3:0}
@@ -1335,10 +1206,10 @@ ENTRY(nat_consumption)
 	dep r16=-1,r16,IA64_PSR_ED_BIT,1
 (p6)	br.cond.spnt 1f		// branch if (cr.ispr.na == 0 || cr.ipsr.code{3:0} != LFETCH)
 	;;
-	mov cr.ipsr=r16		// set cr.ipsr.na
+	MOV_TO_IPSR(p0, r16, r18)
 	mov pr=r31,-1
 	;;
-	rfi
+	RFI
 
 1:	mov pr=r31,-1
 	;;
@@ -1360,26 +1231,26 @@ ENTRY(speculation_vector)
 	 *
 	 * cr.imm contains zero_ext(imm21)
 	 */
-	mov r18=cr.iim
+	MOV_FROM_IIM(r18)
 	;;
-	mov r17=cr.iip
+	MOV_FROM_IIP(r17)
 	shl r18=r18,43			// put sign bit in position (43=64-21)
 	;;
 
-	mov r16=cr.ipsr
+	MOV_FROM_IPSR(p0, r16)
 	shr r18=r18,39			// sign extend (39=43-4)
 	;;
 
 	add r17=r17,r18			// now add the offset
 	;;
-	mov cr.iip=r17
+	MOV_FROM_IIP(r17)
 	dep r16=0,r16,41,2		// clear EI
 	;;
 
-	mov cr.ipsr=r16
+	MOV_FROM_IPSR(p0, r16)
 	;;
 
-	rfi				// and go back
+	RFI
 END(speculation_vector)
 
 	.org ia64_ivt+0x5800
@@ -1517,11 +1388,11 @@ ENTRY(ia32_intercept)
 	DBG_FAULT(46)
 #ifdef	CONFIG_IA32_SUPPORT
 	mov r31=pr
-	mov r16=cr.isr
+	MOV_FROM_ISR(r16)
 	;;
 	extr.u r17=r16,16,8	// get ISR.code
 	mov r18=ar.eflag
-	mov r19=cr.iim		// old eflag value
+	MOV_FROM_IIM(r19)	// old eflag value
 	;;
 	cmp.ne p6,p0=2,r17
 (p6)	br.cond.spnt 1f		// not a system flag fault
@@ -1533,7 +1404,7 @@ ENTRY(ia32_intercept)
 (p6)	br.cond.spnt 1f		// eflags.ac bit didn't change
 	;;
 	mov pr=r31,-1		// restore predicate registers
-	rfi
+	RFI
 
 1:
 #endif	// CONFIG_IA32_SUPPORT
@@ -1673,6 +1544,137 @@ END(ia32_interrupt)
 	DBG_FAULT(67)
 	FAULT(67)
 
+	//-----------------------------------------------------------------------------------
+	// call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
+ENTRY(page_fault)
+	SSM_PSR_DT_AND_SRLZ_I
+	;;
+	SAVE_MIN_WITH_COVER
+	alloc r15=ar.pfs,0,0,3,0
+	MOV_FROM_IFA(out0)
+	MOV_FROM_ISR(out1)
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r14, r3)
+	adds r3=8,r2				// set up second base pointer
+	SSM_PSR_I(p15, p15, r14)		// restore psr.i
+	movl r14=ia64_leave_kernel
+	;;
+	SAVE_REST
+	mov rp=r14
+	;;
+	adds out2=16,r12			// out2 = pointer to pt_regs
+	br.call.sptk.many b6=ia64_do_page_fault	// ignore return address
+END(page_fault)
+
+ENTRY(non_syscall)
+	mov ar.rsc=r27			// restore ar.rsc before SAVE_MIN_WITH_COVER
+	;;
+	SAVE_MIN_WITH_COVER
+
+	// There is no particular reason for this code to be here, other than that
+	// there happens to be space here that would go unused otherwise.  If this
+	// fault ever gets "unreserved", simply moved the following code to a more
+	// suitable spot...
+
+	alloc r14=ar.pfs,0,0,2,0
+	MOV_FROM_IIM(out0)
+	add out1=16,sp
+	adds r3=8,r2			// set up second base pointer for SAVE_REST
+
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r15, r24)
+					// guarantee that interruption collection is on
+	SSM_PSR_I(p15, p15, r15)	// restore psr.i
+	movl r15=ia64_leave_kernel
+	;;
+	SAVE_REST
+	mov rp=r15
+	;;
+	br.call.sptk.many b6=ia64_bad_break	// avoid WAW on CFM and ignore return addr
+END(non_syscall)
+
+ENTRY(__interrupt)
+	DBG_FAULT(12)
+	mov r31=pr		// prepare to save predicates
+	;;
+	SAVE_MIN_WITH_COVER	// uses r31; defines r2 and r3
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r14)
+				// ensure everybody knows psr.ic is back on
+	adds r3=8,r2		// set up second base pointer for SAVE_REST
+	;;
+	SAVE_REST
+	;;
+	MCA_RECOVER_RANGE(interrupt)
+	alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
+	MOV_FROM_IVR(out0, r8)	// pass cr.ivr as first arg
+	add out1=16,sp		// pass pointer to pt_regs as second arg
+	;;
+	srlz.d			// make sure we see the effect of cr.ivr
+	movl r14=ia64_leave_kernel
+	;;
+	mov rp=r14
+	br.call.sptk.many b6=ia64_handle_irq
+END(__interrupt)
+
+	/*
+	 * There is no particular reason for this code to be here, other than that
+	 * there happens to be space here that would go unused otherwise.  If this
+	 * fault ever gets "unreserved", simply moved the following code to a more
+	 * suitable spot...
+	 */
+
+ENTRY(dispatch_unaligned_handler)
+	SAVE_MIN_WITH_COVER
+	;;
+	alloc r14=ar.pfs,0,0,2,0		// now it's safe (must be first in insn group!)
+	MOV_FROM_IFA(out0)
+	adds out1=16,sp
+
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
+						// guarantee that interruption collection is on
+	SSM_PSR_I(p15, p15, r3)			// restore psr.i
+	adds r3=8,r2				// set up second base pointer
+	;;
+	SAVE_REST
+	movl r14=ia64_leave_kernel
+	;;
+	mov rp=r14
+	br.sptk.many ia64_prepare_handle_unaligned
+END(dispatch_unaligned_handler)
+
+	/*
+	 * There is no particular reason for this code to be here, other than that
+	 * there happens to be space here that would go unused otherwise.  If this
+	 * fault ever gets "unreserved", simply moved the following code to a more
+	 * suitable spot...
+	 */
+
+ENTRY(dispatch_to_fault_handler)
+	/*
+	 * Input:
+	 *	psr.ic:	off
+	 *	r19:	fault vector number (e.g., 24 for General Exception)
+	 *	r31:	contains saved predicates (pr)
+	 */
+	SAVE_MIN_WITH_COVER_R19
+	alloc r14=ar.pfs,0,0,5,0
+	MOV_FROM_ISR(out1)
+	MOV_FROM_IFA(out2)
+	MOV_FROM_IIM(out3)
+	MOV_FROM_ITIR(out4)
+	;;
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, out0)
+						// guarantee that interruption collection is on
+	mov out0=r15
+	;;
+	SSM_PSR_I(p15, p15, r3)			// restore psr.i
+	adds r3=8,r2				// set up second base pointer for SAVE_REST
+	;;
+	SAVE_REST
+	movl r14=ia64_leave_kernel
+	;;
+	mov rp=r14
+	br.call.sptk.many b6=ia64_fault
+END(dispatch_to_fault_handler)
+
 	/*
 	 * Squatting in this space ...
 	 *
@@ -1686,11 +1688,10 @@ ENTRY(dispatch_illegal_op_fault)
 	.prologue
 	.body
 	SAVE_MIN_WITH_COVER
-	ssm psr.ic | PSR_DEFAULT_BITS
-	;;
-	srlz.i		// guarantee that interruption collection is on
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
+				// guarantee that interruption collection is on
 	;;
-(p15)	ssm psr.i	// restore psr.i
+	SSM_PSR_I(p15, p15, r3)	// restore psr.i
 	adds r3=8,r2	// set up second base pointer for SAVE_REST
 	;;
 	alloc r14=ar.pfs,0,0,1,0	// must be first in insn group
@@ -1729,12 +1730,11 @@ END(dispatch_illegal_op_fault)
 ENTRY(dispatch_to_ia32_handler)
 	SAVE_MIN
 	;;
-	mov r14=cr.isr
-	ssm psr.ic | PSR_DEFAULT_BITS
-	;;
-	srlz.i					// guarantee that interruption collection is on
+	MOV_FROM_ISR(r14)
+	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
+				// guarantee that interruption collection is on
 	;;
-(p15)	ssm psr.i
+	SSM_PSR_I(p15, p15, r3)
 	adds r3=8,r2		// Base pointer for SAVE_REST
 	;;
 	SAVE_REST
diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h
index 74b6d67..292e214 100644
--- a/arch/ia64/kernel/minstate.h
+++ b/arch/ia64/kernel/minstate.h
@@ -2,6 +2,7 @@
 #include <asm/cache.h>
 
 #include "entry.h"
+#include "paravirt_inst.h"
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 /* read ar.itc in advance, and use it before leaving bank 0 */
@@ -43,16 +44,16 @@
  * Note that psr.ic is NOT turned on by this macro.  This is so that
  * we can pass interruption state as arguments to a handler.
  */
-#define DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA,WORKAROUND)						\
+#define IA64_NATIVE_DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA,WORKAROUND)				\
 	mov r16=IA64_KR(CURRENT);	/* M */							\
 	mov r27=ar.rsc;			/* M */							\
 	mov r20=r1;			/* A */							\
 	mov r25=ar.unat;		/* M */							\
-	mov r29=cr.ipsr;		/* M */							\
+	MOV_FROM_IPSR(p0,r29);		/* M */							\
 	mov r26=ar.pfs;			/* I */							\
-	mov r28=cr.iip;			/* M */							\
+	MOV_FROM_IIP(r28);			/* M */						\
 	mov r21=ar.fpsr;		/* M */							\
-	COVER;				/* B;; (or nothing) */					\
+	__COVER;				/* B;; (or nothing) */				\
 	;;											\
 	adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16;						\
 	;;											\
@@ -244,6 +245,6 @@
 1:						\
 	.pred.rel "mutex", pKStk, pUStk
 
-#define SAVE_MIN_WITH_COVER	DO_SAVE_MIN(cover, mov r30=cr.ifs, , RSE_WORKAROUND)
-#define SAVE_MIN_WITH_COVER_R19	DO_SAVE_MIN(cover, mov r30=cr.ifs, mov r15=r19, RSE_WORKAROUND)
+#define SAVE_MIN_WITH_COVER	DO_SAVE_MIN(COVER, mov r30=cr.ifs, , RSE_WORKAROUND)
+#define SAVE_MIN_WITH_COVER_R19	DO_SAVE_MIN(COVER, mov r30=cr.ifs, mov r15=r19, RSE_WORKAROUND)
 #define SAVE_MIN			DO_SAVE_MIN(     , mov r30=r0, , )
diff --git a/arch/ia64/kernel/nr-irqs.c b/arch/ia64/kernel/nr-irqs.c
new file mode 100644
index 0000000..1ae0491
--- /dev/null
+++ b/arch/ia64/kernel/nr-irqs.c
@@ -0,0 +1,24 @@
+/*
+ * calculate
+ * NR_IRQS = max(IA64_NATIVE_NR_IRQS, XEN_NR_IRQS, FOO_NR_IRQS...)
+ * depending on config.
+ * This must be calculated before processing asm-offset.c.
+ */
+
+#define ASM_OFFSETS_C 1
+
+#include <linux/kbuild.h>
+#include <linux/threads.h>
+#include <asm-ia64/native/irq.h>
+
+void foo(void)
+{
+	union paravirt_nr_irqs_max {
+		char ia64_native_nr_irqs[IA64_NATIVE_NR_IRQS];
+#ifdef CONFIG_XEN
+		char xen_nr_irqs[XEN_NR_IRQS];
+#endif
+	};
+
+	DEFINE(NR_IRQS, sizeof (union paravirt_nr_irqs_max));
+}
diff --git a/arch/ia64/kernel/paravirt.c b/arch/ia64/kernel/paravirt.c
new file mode 100644
index 0000000..afaf5b9
--- /dev/null
+++ b/arch/ia64/kernel/paravirt.c
@@ -0,0 +1,369 @@
+/******************************************************************************
+ * arch/ia64/kernel/paravirt.c
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *     Yaozu (Eddie) Dong <eddie.dong@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/init.h>
+
+#include <linux/compiler.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include <asm/iosapic.h>
+#include <asm/paravirt.h>
+
+/***************************************************************************
+ * general info
+ */
+struct pv_info pv_info = {
+	.kernel_rpl = 0,
+	.paravirt_enabled = 0,
+	.name = "bare hardware"
+};
+
+/***************************************************************************
+ * pv_init_ops
+ * initialization hooks.
+ */
+
+struct pv_init_ops pv_init_ops;
+
+/***************************************************************************
+ * pv_cpu_ops
+ * intrinsics hooks.
+ */
+
+/* ia64_native_xxx are macros so that we have to make them real functions */
+
+#define DEFINE_VOID_FUNC1(name)					\
+	static void						\
+	ia64_native_ ## name ## _func(unsigned long arg)	\
+	{							\
+		ia64_native_ ## name(arg);			\
+	}							\
+
+#define DEFINE_VOID_FUNC2(name)					\
+	static void						\
+	ia64_native_ ## name ## _func(unsigned long arg0,	\
+				      unsigned long arg1)	\
+	{							\
+		ia64_native_ ## name(arg0, arg1);		\
+	}							\
+
+#define DEFINE_FUNC0(name)			\
+	static unsigned long			\
+	ia64_native_ ## name ## _func(void)	\
+	{					\
+		return ia64_native_ ## name();	\
+	}
+
+#define DEFINE_FUNC1(name, type)			\
+	static unsigned long				\
+	ia64_native_ ## name ## _func(type arg)		\
+	{						\
+		return ia64_native_ ## name(arg);	\
+	}						\
+
+DEFINE_VOID_FUNC1(fc);
+DEFINE_VOID_FUNC1(intrin_local_irq_restore);
+
+DEFINE_VOID_FUNC2(ptcga);
+DEFINE_VOID_FUNC2(set_rr);
+
+DEFINE_FUNC0(get_psr_i);
+
+DEFINE_FUNC1(thash, unsigned long);
+DEFINE_FUNC1(get_cpuid, int);
+DEFINE_FUNC1(get_pmd, int);
+DEFINE_FUNC1(get_rr, unsigned long);
+
+static void
+ia64_native_ssm_i_func(void)
+{
+	ia64_native_ssm(IA64_PSR_I);
+}
+
+static void
+ia64_native_rsm_i_func(void)
+{
+	ia64_native_rsm(IA64_PSR_I);
+}
+
+static void
+ia64_native_set_rr0_to_rr4_func(unsigned long val0, unsigned long val1,
+				unsigned long val2, unsigned long val3,
+				unsigned long val4)
+{
+	ia64_native_set_rr0_to_rr4(val0, val1, val2, val3, val4);
+}
+
+#define CASE_GET_REG(id)				\
+	case _IA64_REG_ ## id:				\
+	res = ia64_native_getreg(_IA64_REG_ ## id);	\
+	break;
+#define CASE_GET_AR(id) CASE_GET_REG(AR_ ## id)
+#define CASE_GET_CR(id) CASE_GET_REG(CR_ ## id)
+
+unsigned long
+ia64_native_getreg_func(int regnum)
+{
+	unsigned long res = -1;
+	switch (regnum) {
+	CASE_GET_REG(GP);
+	CASE_GET_REG(IP);
+	CASE_GET_REG(PSR);
+	CASE_GET_REG(TP);
+	CASE_GET_REG(SP);
+
+	CASE_GET_AR(KR0);
+	CASE_GET_AR(KR1);
+	CASE_GET_AR(KR2);
+	CASE_GET_AR(KR3);
+	CASE_GET_AR(KR4);
+	CASE_GET_AR(KR5);
+	CASE_GET_AR(KR6);
+	CASE_GET_AR(KR7);
+	CASE_GET_AR(RSC);
+	CASE_GET_AR(BSP);
+	CASE_GET_AR(BSPSTORE);
+	CASE_GET_AR(RNAT);
+	CASE_GET_AR(FCR);
+	CASE_GET_AR(EFLAG);
+	CASE_GET_AR(CSD);
+	CASE_GET_AR(SSD);
+	CASE_GET_AR(CFLAG);
+	CASE_GET_AR(FSR);
+	CASE_GET_AR(FIR);
+	CASE_GET_AR(FDR);
+	CASE_GET_AR(CCV);
+	CASE_GET_AR(UNAT);
+	CASE_GET_AR(FPSR);
+	CASE_GET_AR(ITC);
+	CASE_GET_AR(PFS);
+	CASE_GET_AR(LC);
+	CASE_GET_AR(EC);
+
+	CASE_GET_CR(DCR);
+	CASE_GET_CR(ITM);
+	CASE_GET_CR(IVA);
+	CASE_GET_CR(PTA);
+	CASE_GET_CR(IPSR);
+	CASE_GET_CR(ISR);
+	CASE_GET_CR(IIP);
+	CASE_GET_CR(IFA);
+	CASE_GET_CR(ITIR);
+	CASE_GET_CR(IIPA);
+	CASE_GET_CR(IFS);
+	CASE_GET_CR(IIM);
+	CASE_GET_CR(IHA);
+	CASE_GET_CR(LID);
+	CASE_GET_CR(IVR);
+	CASE_GET_CR(TPR);
+	CASE_GET_CR(EOI);
+	CASE_GET_CR(IRR0);
+	CASE_GET_CR(IRR1);
+	CASE_GET_CR(IRR2);
+	CASE_GET_CR(IRR3);
+	CASE_GET_CR(ITV);
+	CASE_GET_CR(PMV);
+	CASE_GET_CR(CMCV);
+	CASE_GET_CR(LRR0);
+	CASE_GET_CR(LRR1);
+
+	default:
+		printk(KERN_CRIT "wrong_getreg %d\n", regnum);
+		break;
+	}
+	return res;
+}
+
+#define CASE_SET_REG(id)				\
+	case _IA64_REG_ ## id:				\
+	ia64_native_setreg(_IA64_REG_ ## id, val);	\
+	break;
+#define CASE_SET_AR(id) CASE_SET_REG(AR_ ## id)
+#define CASE_SET_CR(id) CASE_SET_REG(CR_ ## id)
+
+void
+ia64_native_setreg_func(int regnum, unsigned long val)
+{
+	switch (regnum) {
+	case _IA64_REG_PSR_L:
+		ia64_native_setreg(_IA64_REG_PSR_L, val);
+		ia64_dv_serialize_data();
+		break;
+	CASE_SET_REG(SP);
+	CASE_SET_REG(GP);
+
+	CASE_SET_AR(KR0);
+	CASE_SET_AR(KR1);
+	CASE_SET_AR(KR2);
+	CASE_SET_AR(KR3);
+	CASE_SET_AR(KR4);
+	CASE_SET_AR(KR5);
+	CASE_SET_AR(KR6);
+	CASE_SET_AR(KR7);
+	CASE_SET_AR(RSC);
+	CASE_SET_AR(BSP);
+	CASE_SET_AR(BSPSTORE);
+	CASE_SET_AR(RNAT);
+	CASE_SET_AR(FCR);
+	CASE_SET_AR(EFLAG);
+	CASE_SET_AR(CSD);
+	CASE_SET_AR(SSD);
+	CASE_SET_AR(CFLAG);
+	CASE_SET_AR(FSR);
+	CASE_SET_AR(FIR);
+	CASE_SET_AR(FDR);
+	CASE_SET_AR(CCV);
+	CASE_SET_AR(UNAT);
+	CASE_SET_AR(FPSR);
+	CASE_SET_AR(ITC);
+	CASE_SET_AR(PFS);
+	CASE_SET_AR(LC);
+	CASE_SET_AR(EC);
+
+	CASE_SET_CR(DCR);
+	CASE_SET_CR(ITM);
+	CASE_SET_CR(IVA);
+	CASE_SET_CR(PTA);
+	CASE_SET_CR(IPSR);
+	CASE_SET_CR(ISR);
+	CASE_SET_CR(IIP);
+	CASE_SET_CR(IFA);
+	CASE_SET_CR(ITIR);
+	CASE_SET_CR(IIPA);
+	CASE_SET_CR(IFS);
+	CASE_SET_CR(IIM);
+	CASE_SET_CR(IHA);
+	CASE_SET_CR(LID);
+	CASE_SET_CR(IVR);
+	CASE_SET_CR(TPR);
+	CASE_SET_CR(EOI);
+	CASE_SET_CR(IRR0);
+	CASE_SET_CR(IRR1);
+	CASE_SET_CR(IRR2);
+	CASE_SET_CR(IRR3);
+	CASE_SET_CR(ITV);
+	CASE_SET_CR(PMV);
+	CASE_SET_CR(CMCV);
+	CASE_SET_CR(LRR0);
+	CASE_SET_CR(LRR1);
+	default:
+		printk(KERN_CRIT "wrong setreg %d\n", regnum);
+		break;
+	}
+}
+
+struct pv_cpu_ops pv_cpu_ops = {
+	.fc		= ia64_native_fc_func,
+	.thash		= ia64_native_thash_func,
+	.get_cpuid	= ia64_native_get_cpuid_func,
+	.get_pmd	= ia64_native_get_pmd_func,
+	.ptcga		= ia64_native_ptcga_func,
+	.get_rr		= ia64_native_get_rr_func,
+	.set_rr		= ia64_native_set_rr_func,
+	.set_rr0_to_rr4	= ia64_native_set_rr0_to_rr4_func,
+	.ssm_i		= ia64_native_ssm_i_func,
+	.getreg		= ia64_native_getreg_func,
+	.setreg		= ia64_native_setreg_func,
+	.rsm_i		= ia64_native_rsm_i_func,
+	.get_psr_i	= ia64_native_get_psr_i_func,
+	.intrin_local_irq_restore
+			= ia64_native_intrin_local_irq_restore_func,
+};
+EXPORT_SYMBOL(pv_cpu_ops);
+
+/******************************************************************************
+ * replacement of hand written assembly codes.
+ */
+
+void
+paravirt_cpu_asm_init(const struct pv_cpu_asm_switch *cpu_asm_switch)
+{
+	extern unsigned long paravirt_switch_to_targ;
+	extern unsigned long paravirt_leave_syscall_targ;
+	extern unsigned long paravirt_work_processed_syscall_targ;
+	extern unsigned long paravirt_leave_kernel_targ;
+
+	paravirt_switch_to_targ = cpu_asm_switch->switch_to;
+	paravirt_leave_syscall_targ = cpu_asm_switch->leave_syscall;
+	paravirt_work_processed_syscall_targ =
+		cpu_asm_switch->work_processed_syscall;
+	paravirt_leave_kernel_targ = cpu_asm_switch->leave_kernel;
+}
+
+/***************************************************************************
+ * pv_iosapic_ops
+ * iosapic read/write hooks.
+ */
+
+static unsigned int
+ia64_native_iosapic_read(char __iomem *iosapic, unsigned int reg)
+{
+	return __ia64_native_iosapic_read(iosapic, reg);
+}
+
+static void
+ia64_native_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
+{
+	__ia64_native_iosapic_write(iosapic, reg, val);
+}
+
+struct pv_iosapic_ops pv_iosapic_ops = {
+	.pcat_compat_init = ia64_native_iosapic_pcat_compat_init,
+	.get_irq_chip = ia64_native_iosapic_get_irq_chip,
+
+	.__read = ia64_native_iosapic_read,
+	.__write = ia64_native_iosapic_write,
+};
+
+/***************************************************************************
+ * pv_irq_ops
+ * irq operations
+ */
+
+struct pv_irq_ops pv_irq_ops = {
+	.register_ipi = ia64_native_register_ipi,
+
+	.assign_irq_vector = ia64_native_assign_irq_vector,
+	.free_irq_vector = ia64_native_free_irq_vector,
+	.register_percpu_irq = ia64_native_register_percpu_irq,
+
+	.resend_irq = ia64_native_resend_irq,
+};
+
+/***************************************************************************
+ * pv_time_ops
+ * time operations
+ */
+
+static int
+ia64_native_do_steal_accounting(unsigned long *new_itm)
+{
+	return 0;
+}
+
+struct pv_time_ops pv_time_ops = {
+	.do_steal_accounting = ia64_native_do_steal_accounting,
+};
diff --git a/arch/ia64/kernel/paravirt_inst.h b/arch/ia64/kernel/paravirt_inst.h
new file mode 100644
index 0000000..5cad6fb
--- /dev/null
+++ b/arch/ia64/kernel/paravirt_inst.h
@@ -0,0 +1,29 @@
+/******************************************************************************
+ * linux/arch/ia64/xen/paravirt_inst.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifdef __IA64_ASM_PARAVIRTUALIZED_XEN
+#include <asm/xen/inst.h>
+#include <asm/xen/minstate.h>
+#else
+#include <asm/native/inst.h>
+#endif
+
diff --git a/arch/ia64/kernel/paravirtentry.S b/arch/ia64/kernel/paravirtentry.S
new file mode 100644
index 0000000..2f42fcb
--- /dev/null
+++ b/arch/ia64/kernel/paravirtentry.S
@@ -0,0 +1,60 @@
+/******************************************************************************
+ * linux/arch/ia64/xen/paravirtentry.S
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/asm-offsets.h>
+#include "entry.h"
+
+#define DATA8(sym, init_value)			\
+	.pushsection .data.read_mostly ;	\
+	.align 8 ;				\
+	.global sym ;				\
+	sym: ;					\
+	data8 init_value ;			\
+	.popsection
+
+#define BRANCH(targ, reg, breg)		\
+	movl reg=targ ;			\
+	;;				\
+	ld8 reg=[reg] ;			\
+	;;				\
+	mov breg=reg ;			\
+	br.cond.sptk.many breg
+
+#define BRANCH_PROC(sym, reg, breg)				\
+	DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ; \
+	GLOBAL_ENTRY(paravirt_ ## sym) ;			\
+		BRANCH(paravirt_ ## sym ## _targ, reg, breg) ;	\
+	END(paravirt_ ## sym)
+
+#define BRANCH_PROC_UNWINFO(sym, reg, breg)			\
+	DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ; \
+	GLOBAL_ENTRY(paravirt_ ## sym) ;			\
+		PT_REGS_UNWIND_INFO(0) ;			\
+		BRANCH(paravirt_ ## sym ## _targ, reg, breg) ;	\
+	END(paravirt_ ## sym)
+
+
+BRANCH_PROC(switch_to, r22, b7)
+BRANCH_PROC_UNWINFO(leave_syscall, r22, b7)
+BRANCH_PROC(work_processed_syscall, r2, b7)
+BRANCH_PROC_UNWINFO(leave_kernel, r22, b7)
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 632cda8..e5c2de9 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -51,6 +51,7 @@
 #include <asm/mca.h>
 #include <asm/meminit.h>
 #include <asm/page.h>
+#include <asm/paravirt.h>
 #include <asm/patch.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -341,6 +342,8 @@ reserve_memory (void)
 	rsvd_region[n].end   = (unsigned long) ia64_imva(_end);
 	n++;
 
+	n += paravirt_reserve_memory(&rsvd_region[n]);
+
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (ia64_boot_param->initrd_start) {
 		rsvd_region[n].start = (unsigned long)__va(ia64_boot_param->initrd_start);
@@ -519,6 +522,8 @@ setup_arch (char **cmdline_p)
 {
 	unw_init();
 
+	paravirt_arch_setup_early();
+
 	ia64_patch_vtop((u64) __start___vtop_patchlist, (u64) __end___vtop_patchlist);
 
 	*cmdline_p = __va(ia64_boot_param->command_line);
@@ -583,6 +588,9 @@ setup_arch (char **cmdline_p)
 	acpi_boot_init();
 #endif
 
+	paravirt_banner();
+	paravirt_arch_setup_console(cmdline_p);
+
 #ifdef CONFIG_VT
 	if (!conswitchp) {
 # if defined(CONFIG_DUMMY_CONSOLE)
@@ -602,6 +610,8 @@ setup_arch (char **cmdline_p)
 #endif
 
 	/* enable IA-64 Machine Check Abort Handling unless disabled */
+	if (paravirt_arch_setup_nomca())
+		nomca = 1;
 	if (!nomca)
 		ia64_mca_init();
 
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 9d1d429..03f1a99 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -50,6 +50,7 @@
 #include <asm/machvec.h>
 #include <asm/mca.h>
 #include <asm/page.h>
+#include <asm/paravirt.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -642,6 +643,7 @@ void __devinit smp_prepare_boot_cpu(void)
 	cpu_set(smp_processor_id(), cpu_online_map);
 	cpu_set(smp_processor_id(), cpu_callin_map);
 	per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
+	paravirt_post_smp_prepare_boot_cpu();
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index aad1b7b..65c10a4 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -24,6 +24,7 @@
 #include <asm/machvec.h>
 #include <asm/delay.h>
 #include <asm/hw_irq.h>
+#include <asm/paravirt.h>
 #include <asm/ptrace.h>
 #include <asm/sal.h>
 #include <asm/sections.h>
@@ -48,6 +49,15 @@ EXPORT_SYMBOL(last_cli_ip);
 
 #endif
 
+#ifdef CONFIG_PARAVIRT
+static void
+paravirt_clocksource_resume(void)
+{
+	if (pv_time_ops.clocksource_resume)
+		pv_time_ops.clocksource_resume();
+}
+#endif
+
 static struct clocksource clocksource_itc = {
 	.name           = "itc",
 	.rating         = 350,
@@ -56,6 +66,9 @@ static struct clocksource clocksource_itc = {
 	.mult           = 0, /*to be calculated*/
 	.shift          = 16,
 	.flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+#ifdef CONFIG_PARAVIRT
+	.resume		= paravirt_clocksource_resume,
+#endif
 };
 static struct clocksource *itc_clocksource;
 
@@ -157,6 +170,9 @@ timer_interrupt (int irq, void *dev_id)
 
 	profile_tick(CPU_PROFILING);
 
+	if (paravirt_do_steal_accounting(&new_itm))
+		goto skip_process_time_accounting;
+
 	while (1) {
 		update_process_times(user_mode(get_irq_regs()));
 
@@ -186,6 +202,8 @@ timer_interrupt (int irq, void *dev_id)
 		local_irq_disable();
 	}
 
+skip_process_time_accounting:
+
 	do {
 		/*
 		 * If we're too close to the next clock tick for
@@ -335,6 +353,11 @@ ia64_init_itm (void)
 		 */
 		clocksource_itc.rating = 50;
 
+	paravirt_init_missing_ticks_accounting(smp_processor_id());
+
+	/* avoid softlock up message when cpu is unplug and plugged again. */
+	touch_softlockup_watchdog();
+
 	/* Setup the CPU local timer tick */
 	ia64_cpu_local_tick();
 
diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S
index 5929ab1..5a77206 100644
--- a/arch/ia64/kernel/vmlinux.lds.S
+++ b/arch/ia64/kernel/vmlinux.lds.S
@@ -4,7 +4,6 @@
 #include <asm/system.h>
 #include <asm/pgtable.h>
 
-#define LOAD_OFFSET	(KERNEL_START - KERNEL_TR_PAGE_SIZE)
 #include <asm-generic/vmlinux.lds.h>
 
 #define IVT_TEXT							\