Merge tag 'for-linus-5.10b-rc1-tag' of git://git.kernel.org/pub/scm/l…

…inux/kernel/git/xen/tip

Pull xen updates from Juergen Gross:

 - two small cleanup patches

 - avoid error messages when initializing MCA banks in a Xen dom0

 - a small series for converting the Xen gntdev driver to use
   pin_user_pages*() instead of get_user_pages*()

 - intermediate fix for running as a Xen guest on Arm with KPTI enabled
   (the final solution will need new Xen functionality)

* tag 'for-linus-5.10b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: Fix typo in xen_pagetable_p2m_free()
  x86/xen: disable Firmware First mode for correctable memory errors
  xen/arm: do not setup the runstate info page if kpti is enabled
  xen: remove redundant initialization of variable ret
  xen/gntdev.c: Convert get_user_pages*() to pin_user_pages*()
  xen/gntdev.c: Mark pages as dirty

arch/arm/include/asm/xen/page.h

@@ -1 +1,6 @@
 #include <xen/arm/page.h>
+
+static inline bool xen_kernel_unmapped_at_usr(void)
+{
+	return false;
+}

arch/arm/xen/enlighten.c

@@ -158,7 +158,8 @@ static int xen_starting_cpu(unsigned int cpu)
 	BUG_ON(err);
 	per_cpu(xen_vcpu, cpu) = vcpup;
 
-	xen_setup_runstate_info(cpu);
+	if (!xen_kernel_unmapped_at_usr())
+		xen_setup_runstate_info(cpu);
 
 after_register_vcpu_info:
 	enable_percpu_irq(xen_events_irq, 0);
@@ -387,7 +388,8 @@ static int __init xen_guest_init(void)
 		return -EINVAL;
 	}
 
-	xen_time_setup_guest();
+	if (!xen_kernel_unmapped_at_usr())
+		xen_time_setup_guest();
 
 	if (xen_initial_domain())
 		pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);

arch/arm64/include/asm/xen/page.h

@@ -1 +1,7 @@
 #include <xen/arm/page.h>
+#include <asm/mmu.h>
+
+static inline bool xen_kernel_unmapped_at_usr(void)
+{
+	return arm64_kernel_unmapped_at_el0();
+}

arch/x86/xen/enlighten_pv.c

@@ -1370,6 +1370,15 @@ asmlinkage __visible void __init xen_start_kernel(void)
 		x86_init.mpparse.get_smp_config = x86_init_uint_noop;
 
 		xen_boot_params_init_edd();
+
+#ifdef CONFIG_ACPI
+		/*
+		 * Disable selecting "Firmware First mode" for correctable
+		 * memory errors, as this is the duty of the hypervisor to
+		 * decide.
+		 */
+		acpi_disable_cmcff = 1;
+#endif
 	}
 
 	if (!boot_params.screen_info.orig_video_isVGA)

arch/x86/xen/mmu_pv.c

@@ -1142,7 +1142,7 @@ static void __init xen_pagetable_p2m_free(void)
 	 * We could be in __ka space.
 	 * We roundup to the PMD, which means that if anybody at this stage is
 	 * using the __ka address of xen_start_info or
-	 * xen_start_info->shared_info they are in going to crash. Fortunatly
+	 * xen_start_info->shared_info they are in going to crash. Fortunately
 	 * we have already revectored in xen_setup_kernel_pagetable.
 	 */
 	size = roundup(size, PMD_SIZE);

drivers/xen/gntdev.c

@@ -720,17 +720,18 @@ struct gntdev_copy_batch {
 	s16 __user *status[GNTDEV_COPY_BATCH];
 	unsigned int nr_ops;
 	unsigned int nr_pages;
+	bool writeable;
 };
 
 static int gntdev_get_page(struct gntdev_copy_batch *batch, void __user *virt,
-			   bool writeable, unsigned long *gfn)
+				unsigned long *gfn)
 {
 	unsigned long addr = (unsigned long)virt;
 	struct page *page;
 	unsigned long xen_pfn;
 	int ret;
 
-	ret = get_user_pages_fast(addr, 1, writeable ? FOLL_WRITE : 0, &page);
+	ret = pin_user_pages_fast(addr, 1, batch->writeable ? FOLL_WRITE : 0, &page);
 	if (ret < 0)
 		return ret;
 
@@ -744,11 +745,9 @@ static int gntdev_get_page(struct gntdev_copy_batch *batch, void __user *virt,
 
 static void gntdev_put_pages(struct gntdev_copy_batch *batch)
 {
-	unsigned int i;
-
-	for (i = 0; i < batch->nr_pages; i++)
-		put_page(batch->pages[i]);
+	unpin_user_pages_dirty_lock(batch->pages, batch->nr_pages, batch->writeable);
 	batch->nr_pages = 0;
+	batch->writeable = false;
 }
 
 static int gntdev_copy(struct gntdev_copy_batch *batch)
@@ -837,8 +836,9 @@ static int gntdev_grant_copy_seg(struct gntdev_copy_batch *batch,
 			virt = seg->source.virt + copied;
 			off = (unsigned long)virt & ~XEN_PAGE_MASK;
 			len = min(len, (size_t)XEN_PAGE_SIZE - off);
+			batch->writeable = false;
 
-			ret = gntdev_get_page(batch, virt, false, &gfn);
+			ret = gntdev_get_page(batch, virt, &gfn);
 			if (ret < 0)
 				return ret;
 
@@ -856,8 +856,9 @@ static int gntdev_grant_copy_seg(struct gntdev_copy_batch *batch,
 			virt = seg->dest.virt + copied;
 			off = (unsigned long)virt & ~XEN_PAGE_MASK;
 			len = min(len, (size_t)XEN_PAGE_SIZE - off);
+			batch->writeable = true;
 
-			ret = gntdev_get_page(batch, virt, true, &gfn);
+			ret = gntdev_get_page(batch, virt, &gfn);
 			if (ret < 0)
 				return ret;
 

drivers/xen/pvcalls-front.c

@@ -371,7 +371,7 @@ static int alloc_active_ring(struct sock_mapping *map)
 static int create_active(struct sock_mapping *map, evtchn_port_t *evtchn)
 {
 	void *bytes;
-	int ret = -ENOMEM, irq = -1, i;
+	int ret, irq = -1, i;
 
 	*evtchn = 0;
 	init_waitqueue_head(&map->active.inflight_conn_req);