Merge tag 'stable/for-linus-3.17-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen updates from David Vrabel:
 - remove unused V2 grant table support
 - note that Konrad is xen-blkkback/front maintainer
 - add 'xen_nopv' option to disable PV extentions for x86 HVM guests
 - misc minor cleanups

* tag 'stable/for-linus-3.17-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen-pciback: Document the 'quirks' sysfs file
  xen/pciback: Fix error return code in xen_pcibk_attach()
  xen/events: drop negativity check of unsigned parameter
  xen/setup: Remove Identity Map Debug Message
  xen/events/fifo: remove a unecessary use of BM()
  xen/events/fifo: ensure all bitops are properly aligned even on x86
  xen/events/fifo: reset control block and local HEADs on resume
  xen/arm: use BUG_ON
  xen/grant-table: remove support for V2 tables
  x86/xen: safely map and unmap grant frames when in atomic context
  MAINTAINERS: Make me the Xen block subsystem (front and back) maintainer
  xen: Introduce 'xen_nopv' to disable PV extensions for HVM guests.

3 files changed, 20 insertions, 58 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 94813515fdd..c0cb11fb500 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1828,8 +1828,19 @@ static void __init xen_hvm_guest_init(void)
 	xen_hvm_init_mmu_ops();
 }
 
+static bool xen_nopv = false;
+static __init int xen_parse_nopv(char *arg)
+{
+       xen_nopv = true;
+       return 0;
+}
+early_param("xen_nopv", xen_parse_nopv);
+
 static uint32_t __init xen_hvm_platform(void)
 {
+	if (xen_nopv)
+		return 0;
+
 	if (xen_pv_domain())
 		return 0;
 
@@ -1838,6 +1849,8 @@ static uint32_t __init xen_hvm_platform(void)
 
 bool xen_hvm_need_lapic(void)
 {
+	if (xen_nopv)
+		return false;
 	if (xen_pv_domain())
 		return false;
 	if (!xen_hvm_domain())
diff --git a/arch/x86/xen/grant-table.c b/arch/x86/xen/grant-table.c
index ebfa9b2c871..c0413046483 100644
--- a/arch/x86/xen/grant-table.c
+++ b/arch/x86/xen/grant-table.c
@@ -49,7 +49,7 @@
 static struct gnttab_vm_area {
 	struct vm_struct *area;
 	pte_t **ptes;
-} gnttab_shared_vm_area, gnttab_status_vm_area;
+} gnttab_shared_vm_area;
 
 int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
 			   unsigned long max_nr_gframes,
@@ -73,43 +73,16 @@ int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
 	return 0;
 }
 
-int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
-			   unsigned long max_nr_gframes,
-			   grant_status_t **__shared)
-{
-	grant_status_t *shared = *__shared;
-	unsigned long addr;
-	unsigned long i;
-
-	if (shared == NULL)
-		*__shared = shared = gnttab_status_vm_area.area->addr;
-
-	addr = (unsigned long)shared;
-
-	for (i = 0; i < nr_gframes; i++) {
-		set_pte_at(&init_mm, addr, gnttab_status_vm_area.ptes[i],
-			   mfn_pte(frames[i], PAGE_KERNEL));
-		addr += PAGE_SIZE;
-	}
-
-	return 0;
-}
-
 void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
 {
-	pte_t **ptes;
 	unsigned long addr;
 	unsigned long i;
 
-	if (shared == gnttab_status_vm_area.area->addr)
-		ptes = gnttab_status_vm_area.ptes;
-	else
-		ptes = gnttab_shared_vm_area.ptes;
-
 	addr = (unsigned long)shared;
 
 	for (i = 0; i < nr_gframes; i++) {
-		set_pte_at(&init_mm, addr, ptes[i], __pte(0));
+		set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i],
+			   __pte(0));
 		addr += PAGE_SIZE;
 	}
 }
@@ -129,35 +102,12 @@ static int arch_gnttab_valloc(struct gnttab_vm_area *area, unsigned nr_frames)
 	return 0;
 }
 
-static void arch_gnttab_vfree(struct gnttab_vm_area *area)
+int arch_gnttab_init(unsigned long nr_shared)
 {
-	free_vm_area(area->area);
-	kfree(area->ptes);
-}
-
-int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status)
-{
-	int ret;
-
 	if (!xen_pv_domain())
 		return 0;
 
-	ret = arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared);
-	if (ret < 0)
-		return ret;
-
-	/*
-	 * Always allocate the space for the status frames in case
-	 * we're migrated to a host with V2 support.
-	 */
-	ret = arch_gnttab_valloc(&gnttab_status_vm_area, nr_status);
-	if (ret < 0)
-		goto err;
-
-	return 0;
-  err:
-	arch_gnttab_vfree(&gnttab_shared_vm_area);
-	return -ENOMEM;
+	return arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared);
 }
 
 #ifdef CONFIG_XEN_PVH
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 9bb3d82ffec..3172692381a 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -841,10 +841,9 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s,
 			pfn = ALIGN(pfn, P2M_PER_PAGE);
 	}
 
-	if (!WARN((pfn - pfn_s) != (pfn_e - pfn_s),
+	WARN((pfn - pfn_s) != (pfn_e - pfn_s),
 		"Identity mapping failed. We are %ld short of 1-1 mappings!\n",
-		(pfn_e - pfn_s) - (pfn - pfn_s)))
-		printk(KERN_DEBUG "1-1 mapping on %lx->%lx\n", pfn_s, pfn);
+		(pfn_e - pfn_s) - (pfn - pfn_s));
 
 	return pfn - pfn_s;
 }