Remove support for Xen PV domU kernels. Support for HVM domU kernels

remains.  Xen is planning to phase out support for PV upstream since it
is harder to maintain and has more overhead.  Modern x86 CPUs include
virtualization extensions that support HVM guests instead of PV guests.
In addition, the PV code was i386 only and not as well maintained recently
as the HVM code.
- Remove the i386-only NATIVE option that was used to disable certain
  components for PV kernels.  These components are now standard as they
  are on amd64.
- Remove !XENHVM bits from PV drivers.
- Remove various shims required for XEN (e.g. PT_UPDATES_FLUSH, LOAD_CR3,
  etc.)
- Remove duplicate copy of <xen/features.h>.
- Remove unused, i386-only xenstored.h.

Differential Revision:	https://reviews.freebsd.org/D2362
Reviewed by:	royger
Tested by:	royger (i386/amd64 HVM domU and amd64 PVH dom0)
Relnotes:	yes

1 files changed, 4 insertions, 42 deletions

diff --git a/sys/i386/include/cpufunc.h b/sys/i386/include/cpufunc.h
index f80a898..3bc25d4 100644
--- a/sys/i386/include/cpufunc.h
+++ b/sys/i386/include/cpufunc.h
@@ -42,17 +42,6 @@
 #error this file needs sys/cdefs.h as a prerequisite
 #endif
 
-#ifdef XEN
-extern void xen_cli(void);
-extern void xen_sti(void);
-extern u_int xen_rcr2(void);
-extern void xen_load_cr3(u_int data);
-extern void xen_tlb_flush(void);
-extern void xen_invlpg(u_int addr);
-extern void write_eflags(u_int eflags);
-extern u_int read_eflags(void);
-#endif
-
 struct region_descriptor;
 
 #define readb(va)	(*(volatile uint8_t *) (va))
@@ -106,11 +95,8 @@ clts(void)
 static __inline void
 disable_intr(void)
 {
-#ifdef XEN
-	xen_cli();
-#else	
+
 	__asm __volatile("cli" : : : "memory");
-#endif
 }
 
 static __inline void
@@ -132,11 +118,8 @@ cpuid_count(u_int ax, u_int cx, u_int *p)
 static __inline void
 enable_intr(void)
 {
-#ifdef XEN
-	xen_sti();
-#else
+
 	__asm __volatile("sti");
-#endif
 }
 
 static __inline void
@@ -325,11 +308,7 @@ ia32_pause(void)
 }
 
 static __inline u_int
-#ifdef XEN
-_read_eflags(void)
-#else	
 read_eflags(void)
-#endif
 {
 	u_int	ef;
 
@@ -389,11 +368,7 @@ wbinvd(void)
 }
 
 static __inline void
-#ifdef XEN
-_write_eflags(u_int ef)
-#else
 write_eflags(u_int ef)
-#endif
 {
 	__asm __volatile("pushl %0; popfl" : : "r" (ef));
 }
@@ -425,9 +400,6 @@ rcr2(void)
 {
 	u_int	data;
 
-#ifdef XEN
-	return (xen_rcr2());
-#endif
 	__asm __volatile("movl %%cr2,%0" : "=r" (data));
 	return (data);
 }
@@ -435,11 +407,8 @@ rcr2(void)
 static __inline void
 load_cr3(u_int data)
 {
-#ifdef XEN
-	xen_load_cr3(data);
-#else
+
 	__asm __volatile("movl %0,%%cr3" : : "r" (data) : "memory");
-#endif
 }
 
 static __inline u_int
@@ -491,11 +460,8 @@ load_xcr(u_int reg, uint64_t val)
 static __inline void
 invltlb(void)
 {
-#ifdef XEN
-	xen_tlb_flush();
-#else	
+
 	load_cr3(rcr3());
-#endif
 }
 
 /*
@@ -506,11 +472,7 @@ static __inline void
 invlpg(u_int addr)
 {
 
-#ifdef XEN
-	xen_invlpg(addr);
-#else
 	__asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
-#endif
 }
 
 static __inline u_short