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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Stefano Stabellini <stefanos@xilinx.com>,
        Juergen Gross <jgross@suse.com>, Jeff.Kubascik@dornerworks.com,
        Jarvis.Roach@dornerworks.com, Nathan.Studer@dornerworks.com,
        vkuznets@redhat.com, boris.ostrovsky@oracle.com,
        julien.grall@arm.com
Subject: [PATCH 4.14 120/124] CONFIG_XEN_PV breaks xen_create_contiguous_region on ARM
Date:   Mon, 19 Nov 2018 17:29:34 +0100
Message-Id: <20181119162633.797817212@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefano Stabellini <stefanos@xilinx.com>

commit f9005571701920551bcf54a500973fb61f2e1eda upstream.

xen_create_contiguous_region has now only an implementation if
CONFIG_XEN_PV is defined. However, on ARM we never set CONFIG_XEN_PV but
we do have an implementation of xen_create_contiguous_region which is
required for swiotlb-xen to work correctly (although it just sets
*dma_handle).

[backport: remove change to xen_remap_pfn]

Cc: <stable@vger.kernel.org> # 4.12
Fixes: 16624390816c ("xen: create xen_create/destroy_contiguous_region() stubs for PVHVM only builds")
Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
CC: Jeff.Kubascik@dornerworks.com
CC: Jarvis.Roach@dornerworks.com
CC: Nathan.Studer@dornerworks.com
CC: vkuznets@redhat.com
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
CC: julien.grall@arm.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/xen/xen-ops.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -40,7 +40,7 @@ int xen_setup_shutdown_event(void);
 
 extern unsigned long *xen_contiguous_bitmap;
 
-#ifdef CONFIG_XEN_PV
+#if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64)
 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
 				unsigned int address_bits,
 				dma_addr_t *dma_handle);