diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d92b80837cfa..bd31ecdb2257 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4959,11 +4959,13 @@ static DEFINE_SPINLOCK(resource_alignment_lock);
 /**
  * pci_specified_resource_alignment - get resource alignment specified by user.
  * @dev: the PCI device to get
+ * @resize: whether or not to change resources' size when reassigning alignment
  *
  * RETURNS: Resource alignment if it is specified.
  *          Zero if it is not specified.
  */
-static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
+static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev,
+							bool *resize)
 {
 	int seg, bus, slot, func, align_order, count;
 	unsigned short vendor, device, subsystem_vendor, subsystem_device;
@@ -5005,6 +5007,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
 				(!device || (device == dev->device)) &&
 				(!subsystem_vendor || (subsystem_vendor == dev->subsystem_vendor)) &&
 				(!subsystem_device || (subsystem_device == dev->subsystem_device))) {
+				*resize = true;
 				if (align_order == -1)
 					align = PAGE_SIZE;
 				else
@@ -5030,6 +5033,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
 				bus == dev->bus->number &&
 				slot == PCI_SLOT(dev->devfn) &&
 				func == PCI_FUNC(dev->devfn)) {
+				*resize = true;
 				if (align_order == -1)
 					align = PAGE_SIZE;
 				else
@@ -5050,7 +5054,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
 }
 
 static void pci_request_resource_alignment(struct pci_dev *dev, int bar,
-					   resource_size_t align)
+					   resource_size_t align, bool resize)
 {
 	struct resource *r = &dev->resource[bar];
 	resource_size_t size;
@@ -5069,23 +5073,45 @@ static void pci_request_resource_alignment(struct pci_dev *dev, int bar,
 		return;
 
 	/*
-	 * Increase the size of the resource.  BARs are aligned on their
-	 * size, so when we reallocate space for this resource, we'll
-	 * allocate it with the larger alignment.  It also prevents
-	 * assignment of any other BARs inside the size.  If we're
-	 * requesting page alignment, this means no other BARs will share
-	 * the page.
+	 * Increase the alignment of the resource.  There are two ways we
+	 * can do this:
 	 *
-	 * This makes the resource larger than the hardware BAR, which may
-	 * break drivers that compute things based on the resource size,
-	 * e.g., to find registers at a fixed offset before the end of the
-	 * BAR.  We hope users don't request alignment for such devices.
+	 * 1) Increase the size of the resource.  BARs are aligned on their
+	 *    size, so when we reallocate space for this resource, we'll
+	 *    allocate it with the larger alignment.  This also prevents
+	 *    assignment of any other BARs inside the alignment region, so
+	 *    if we're requesting page alignment, this means no other BARs
+	 *    will share the page.
+	 *
+	 *    The disadvantage is that this makes the resource larger than
+	 *    the hardware BAR, which may break drivers that compute things
+	 *    based on the resource size, e.g., to find registers at a
+	 *    fixed offset before the end of the BAR.
+	 *
+	 * 2) Retain the resource size, but use IORESOURCE_STARTALIGN and
+	 *    set r->start to the desired alignment.  By itself this
+	 *    doesn't prevent other BARs being put inside the alignment
+	 *    region, but if we realign *every* resource of every device in
+	 *    the system, none of them will share an alignment region.
+	 *
+	 * When the user has requested alignment for only some devices via
+	 * the "pci=resource_alignment" argument, "resize" is true and we
+	 * use the first method.  Otherwise we assume we're aligning all
+	 * devices and we use the second.
 	 */
+
 	dev_info(&dev->dev, "BAR%d %pR: requesting alignment to %#llx\n",
 		 bar, r, (unsigned long long)align);
 
-	r->start = 0;
-	r->end = align - 1;
+	if (resize) {
+		r->start = 0;
+		r->end = align - 1;
+	} else {
+		r->flags &= ~IORESOURCE_SIZEALIGN;
+		r->flags |= IORESOURCE_STARTALIGN;
+		r->start = align;
+		r->end = r->start + size - 1;
+	}
 	r->flags |= IORESOURCE_UNSET;
 }
 
@@ -5102,6 +5128,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 	struct resource *r;
 	resource_size_t align, size;
 	u16 command;
+	bool resize = false;
 
 	/*
 	 * VF BARs are read-only zero according to SR-IOV spec r1.1, sec
@@ -5113,7 +5140,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 		return;
 
 	/* check if specified PCI is target device to reassign */
-	align = pci_specified_resource_alignment(dev);
+	align = pci_specified_resource_alignment(dev, &resize);
 	if (!align)
 		return;
 
@@ -5131,7 +5158,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 	pci_write_config_word(dev, PCI_COMMAND, command);
 
 	for (i = 0; i <= PCI_ROM_RESOURCE; i++)
-		pci_request_resource_alignment(dev, i, align);
+		pci_request_resource_alignment(dev, i, align, resize);
 
 	/*
 	 * Need to disable bridge's resource window,
