[Xen-devel] [PATCH v4 1/7] arch, arm: domain build: let dom0 access I/O memory of mapped devices

[Arianna Avanzini <avanzini.arianna@xxxxxxxxx>]

Currently, dom0 is allowed access to the I/O memory ranges used
to access devices exposed to it, but it doesn't have those
ranges in its iomem_caps. This commit attempts to implement the
correct bookkeeping in the generic function which actually maps
a device's I/O memory to the domain, adding the ranges to the
domain's iomem_caps.

Signed-off-by: Arianna Avanzini <avanzini.arianna@xxxxxxxxx>
Acked-by: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Cc: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Cc: Paolo Valente <paolo.valente@xxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxxxxx>
Cc: Jan Beulich <JBeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Cc: Eric Trudeau <etrudeau@xxxxxxxxxxxx>
Cc: Viktor Kleinik <viktor.kleinik@xxxxxxxxxxxxxxx>

---

    v4:
        - Hopefully improve commit description.

    v3:
        - Print the domain id in the error message instead of always
          printing "dom0".
        - Fix commit description.

---
 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 5ca2f15..4a0411c 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -11,6 +11,7 @@
 #include <xen/device_tree.h>
 #include <xen/libfdt/libfdt.h>
 #include <xen/guest_access.h>
+#include <xen/iocap.h>
 #include <asm/setup.h>
 #include <asm/platform.h>
 #include <asm/psci.h>
@@ -733,6 +734,16 @@ static int map_device(struct domain *d, const struct 
dt_device_node *dev)
         DPRINT("addr %u = 0x%"PRIx64" - 0x%"PRIx64"\n",
                i, addr, addr + size - 1);
 
+        res = iomem_permit_access(d, paddr_to_pfn(addr & PAGE_MASK),
+                                  paddr_to_pfn(PAGE_ALIGN(addr + size - 1)));
+        if ( res )
+        {
+            printk(XENLOG_ERR "Unable to permit to dom%d access to"
+                   " 0x%"PRIx64" - 0x%"PRIx64"\n",
+                   d->domain_id,
+                   addr & PAGE_MASK, PAGE_ALIGN(addr + size) - 1);
+            return res;
+        }
         res = map_mmio_regions(d, addr & PAGE_MASK,
                                PAGE_ALIGN(addr + size) - 1,
                                addr & PAGE_MASK);
-- 
1.9.0


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