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, 3 insertions, 78 deletions

diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h
index 0d8057f..76822b1 100644
--- a/sys/i386/include/pmap.h
+++ b/sys/i386/include/pmap.h
@@ -219,76 +219,6 @@ extern pd_entry_t *IdlePTD;	/* physical address of "Idle" state directory */
  */
 #define	vtophys(va)	pmap_kextract((vm_offset_t)(va))
 
-#if defined(XEN)
-#include <sys/param.h>
-
-#include <xen/xen-os.h>
-
-#include <machine/xen/xenvar.h>
-#include <machine/xen/xenpmap.h>
-
-extern pt_entry_t pg_nx;
-
-#define PG_KERNEL  (PG_V | PG_A | PG_RW | PG_M)
-
-#define MACH_TO_VM_PAGE(ma) PHYS_TO_VM_PAGE(xpmap_mtop((ma)))
-#define VM_PAGE_TO_MACH(m) xpmap_ptom(VM_PAGE_TO_PHYS((m)))
-
-#define VTOM(va) xpmap_ptom(VTOP(va))
-
-static __inline vm_paddr_t
-pmap_kextract_ma(vm_offset_t va)
-{
-        vm_paddr_t ma;
-        if ((ma = PTD[va >> PDRSHIFT]) & PG_PS) {
-                ma = (ma & ~(NBPDR - 1)) | (va & (NBPDR - 1));
-        } else {
-                ma = (*vtopte(va) & PG_FRAME) | (va & PAGE_MASK);
-        }
-        return ma;
-}
-
-static __inline vm_paddr_t
-pmap_kextract(vm_offset_t va)
-{
-        return xpmap_mtop(pmap_kextract_ma(va));
-}
-#define vtomach(va)     pmap_kextract_ma(((vm_offset_t) (va)))
-
-vm_paddr_t pmap_extract_ma(struct pmap *pmap, vm_offset_t va);
-
-void    pmap_kenter_ma(vm_offset_t va, vm_paddr_t pa);
-void    pmap_map_readonly(struct pmap *pmap, vm_offset_t va, int len);
-void    pmap_map_readwrite(struct pmap *pmap, vm_offset_t va, int len);
-
-static __inline pt_entry_t
-pte_load_store(pt_entry_t *ptep, pt_entry_t v)
-{
-	pt_entry_t r;
-
-	r = *ptep;
-	PT_SET_VA(ptep, v, TRUE);
-	return (r);
-}
-
-static __inline pt_entry_t
-pte_load_store_ma(pt_entry_t *ptep, pt_entry_t v)
-{
-	pt_entry_t r;
-
-	r = *ptep;
-	PT_SET_VA_MA(ptep, v, TRUE);
-	return (r);
-}
-
-#define	pte_load_clear(ptep)	pte_load_store((ptep), (pt_entry_t)0ULL)
-
-#define	pte_store(ptep, pte)	pte_load_store((ptep), (pt_entry_t)pte)
-#define	pte_store_ma(ptep, pte)	pte_load_store_ma((ptep), (pt_entry_t)pte)
-#define	pde_store_ma(ptep, pte)	pte_load_store_ma((ptep), (pt_entry_t)pte)
-
-#elif !defined(XEN)
-
 /*
  * KPTmap is a linear mapping of the kernel page table.  It differs from the
  * recursive mapping in two ways: (1) it only provides access to kernel page
@@ -328,13 +258,8 @@ pmap_kextract(vm_offset_t va)
 	}
 	return (pa);
 }
-#endif
-
-#if !defined(XEN)
-#define PT_UPDATES_FLUSH()
-#endif
 
-#if (defined(PAE) || defined(PAE_TABLES)) && !defined(XEN)
+#if (defined(PAE) || defined(PAE_TABLES))
 
 #define	pde_cmpset(pdep, old, new)	atomic_cmpset_64_i586(pdep, old, new)
 #define	pte_load_store(ptep, pte)	atomic_swap_64_i586(ptep, pte)
@@ -343,7 +268,7 @@ pmap_kextract(vm_offset_t va)
 
 extern pt_entry_t pg_nx;
 
-#elif !defined(PAE) && !defined(PAE_TABLES) && !defined(XEN)
+#else /* !(PAE || PAE_TABLES) */
 
 #define	pde_cmpset(pdep, old, new)	atomic_cmpset_int(pdep, old, new)
 #define	pte_load_store(ptep, pte)	atomic_swap_int(ptep, pte)
@@ -352,7 +277,7 @@ extern pt_entry_t pg_nx;
 	*(u_int *)(ptep) = (u_int)(pte); \
 } while (0)
 
-#endif /* PAE */
+#endif /* !(PAE || PAE_TABLES) */
 
 #define	pte_clear(ptep)			pte_store(ptep, 0)