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

2 files changed, 1 insertions, 18 deletions

diff --git a/sys/i386/pci/pci_cfgreg.c b/sys/i386/pci/pci_cfgreg.c
index 5d57e89..2716a7a 100644
--- a/sys/i386/pci/pci_cfgreg.c
+++ b/sys/i386/pci/pci_cfgreg.c
@@ -93,9 +93,7 @@ static uint32_t	pci_docfgregread(int bus, int slot, int func, int reg,
 		    int bytes);
 static int	pcireg_cfgread(int bus, int slot, int func, int reg, int bytes);
 static void	pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes);
-#ifndef XEN
 static int	pcireg_cfgopen(void);
-#endif
 static int	pciereg_cfgread(int bus, unsigned slot, unsigned func,
 		    unsigned reg, unsigned bytes);
 static void	pciereg_cfgwrite(int bus, unsigned slot, unsigned func,
@@ -116,7 +114,6 @@ pci_i386_map_intline(int line)
 	return (line);
 }
 
-#ifndef XEN
 static u_int16_t
 pcibios_get_version(void)
 {
@@ -137,7 +134,6 @@ pcibios_get_version(void)
 	}
 	return (args.ebx & 0xffff);
 }
-#endif
 
 /* 
  * Initialise access to PCI configuration space 
@@ -145,9 +141,6 @@ pcibios_get_version(void)
 int
 pci_cfgregopen(void)
 {
-#ifdef XEN
-	return (0);
-#else
 	static int		opened = 0;
 	uint64_t		pciebar;
 	u_int16_t		vid, did;
@@ -202,7 +195,6 @@ pci_cfgregopen(void)
 	}
 
 	return(1);
-#endif
 }
 
 static uint32_t
@@ -390,7 +382,6 @@ pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes)
 	mtx_unlock_spin(&pcicfg_mtx);
 }
 
-#ifndef XEN
 /* check whether the configuration mechanism has been correctly identified */
 static int
 pci_cfgcheck(int maxdev)
@@ -607,7 +598,6 @@ pcie_cfgregopen(uint64_t base, uint8_t minbus, uint8_t maxbus)
 
 	return (1);
 }
-#endif /* !XEN */
 
 #define PCIE_PADDR(base, reg, bus, slot, func)	\
 	((base)				+	\
diff --git a/sys/i386/pci/pci_pir.c b/sys/i386/pci/pci_pir.c
index 0d64cab..6aeaae3 100644
--- a/sys/i386/pci/pci_pir.c
+++ b/sys/i386/pci/pci_pir.c
@@ -137,9 +137,6 @@ pci_pir_open(void)
 	int i;
 	uint8_t ck, *cv;
 
-#ifdef XEN
-	return;
-#else	
 	/* Don't try if we've already found a table. */
 	if (pci_route_table != NULL)
 		return;
@@ -150,7 +147,7 @@ pci_pir_open(void)
 		sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0);
 	if (sigaddr == 0)
 		return;
-#endif
+
 	/* If we found something, check the checksum and length. */
 	/* XXX - Use pmap_mapdev()? */
 	pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
@@ -481,11 +478,7 @@ pci_pir_biosroute(int bus, int device, int func, int pin, int irq)
 	args.eax = PCIBIOS_ROUTE_INTERRUPT;
 	args.ebx = (bus << 8) | (device << 3) | func;
 	args.ecx = (irq << 8) | (0xa + pin);
-#ifdef XEN
-	return (0);
-#else	
 	return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL)));
-#endif
 }