[xen stable-4.13] xen/arm: call iomem_permit_access for passthrough devices

[patchbot@xxxxxxx]

commit a702c80ec1936c2ecf00a4628af6a4cfdbc5b909
Author:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
AuthorDate: Tue Apr 14 18:02:55 2020 -0700
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Mar 19 12:20:52 2021 -0700

    xen/arm: call iomem_permit_access for passthrough devices
    
    iomem_permit_access should be called for MMIO regions of devices
    assigned to a domain. Currently it is not called for MMIO regions of
    passthrough devices of Dom0less guests. This patch fixes it.
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
    Acked-by: Julien Grall <julien@xxxxxxx>
    (cherry picked from commit 6b75c7a95420acbb9c118624ff0a5e973287c1e4)
---
 xen/arch/arm/domain_build.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index dd9c3b73ba..8c5ff11cdc 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1798,6 +1798,17 @@ static int __init handle_passthrough_prop(struct 
kernel_info *kinfo,
             return -EINVAL;
         }
 
+        res = iomem_permit_access(kinfo->d, paddr_to_pfn(mstart),
+                                  paddr_to_pfn(PAGE_ALIGN(mstart + size - 1)));
+        if ( res )
+        {
+            printk(XENLOG_ERR "Unable to permit to dom%d access to"
+                   " 0x%"PRIx64" - 0x%"PRIx64"\n",
+                   kinfo->d->domain_id,
+                   mstart & PAGE_MASK, PAGE_ALIGN(mstart + size) - 1);
+            return res;
+        }
+
         res = map_regions_p2mt(kinfo->d,
                                gaddr_to_gfn(gstart),
                                PFN_DOWN(size),
--
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