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, 2 insertions, 30 deletions

diff --git a/sys/i386/include/pcpu.h b/sys/i386/include/pcpu.h
index dc29b6d..231f80f 100644
--- a/sys/i386/include/pcpu.h
+++ b/sys/i386/include/pcpu.h
@@ -44,34 +44,6 @@
  * other processors"
  */
 
-#if defined(XEN)
-
-/* These are peridically updated in shared_info, and then copied here. */
-struct shadow_time_info {
-	uint64_t tsc_timestamp;     /* TSC at last update of time vals.  */
-	uint64_t system_timestamp;  /* Time, in nanosecs, since boot.    */
-	uint32_t tsc_to_nsec_mul;
-	uint32_t tsc_to_usec_mul;
-	int tsc_shift;
-	uint32_t version;
-};
-
-#define	PCPU_XEN_FIELDS							\
-	;								\
-	u_int	pc_cr3;		/* track cr3 for R1/R3*/		\
-	vm_paddr_t *pc_pdir_shadow;					\
-	uint64_t pc_processed_system_time;				\
-	struct shadow_time_info pc_shadow_time;				\
-	char	__pad[185]
-
-#else /* !XEN */
-
-#define PCPU_XEN_FIELDS							\
-	;								\
-	char	__pad[233]
-
-#endif
-
 #define	PCPU_MD_FIELDS							\
 	char	pc_monitorbuf[128] __aligned(128); /* cache line */	\
 	struct	pcpu *pc_prvspace;	/* Self-reference */		\
@@ -85,8 +57,8 @@ struct shadow_time_info {
 	u_int	pc_apic_id;						\
 	int	pc_private_tss;		/* Flag indicating private tss*/\
 	u_int	pc_cmci_mask;		/* MCx banks for CMCI */	\
-	u_int	pc_vcpu_id		/* Xen vCPU ID */		\
-	PCPU_XEN_FIELDS
+	u_int	pc_vcpu_id;		/* Xen vCPU ID */		\
+	char	__pad[233]
 
 #ifdef _KERNEL