[Xen-devel] [PATCH V2] Xen: ARM: Zero reserved fields of xatp before making hypervisor call

[Jiandi An <anjiandi@xxxxxxxxxxxxxx>]

Ensure all reserved fields of xatp are zero before making
hypervisor call to XEN in xen_map_device_mmio().
xenmem_add_to_physmap_one() in XEN fails the mapping request if
extra.res reserved field in xatp is not zero for XENMAPSPACE_dev_mmio
request.

Signed-off-by: Jiandi An <anjiandi@xxxxxxxxxxxxxx>
---
Changed zeroing xatp to a static initialization
of .domid and .space for xatp.

 drivers/xen/arm-device.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
index 778acf8..85dd20e 100644
--- a/drivers/xen/arm-device.c
+++ b/drivers/xen/arm-device.c
@@ -58,9 +58,13 @@ static int xen_map_device_mmio(const struct resource 
*resources,
        xen_pfn_t *gpfns;
        xen_ulong_t *idxs;
        int *errs;
-       struct xen_add_to_physmap_range xatp;
 
        for (i = 0; i < count; i++) {
+               struct xen_add_to_physmap_range xatp = {
+                       .domid = DOMID_SELF,
+                       .space = XENMAPSPACE_dev_mmio
+               };
+
                r = &resources[i];
                nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
                if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
@@ -87,9 +91,7 @@ static int xen_map_device_mmio(const struct resource 
*resources,
                        idxs[j] = XEN_PFN_DOWN(r->start) + j;
                }
 
-               xatp.domid = DOMID_SELF;
                xatp.size = nr;
-               xatp.space = XENMAPSPACE_dev_mmio;
 
                set_xen_guest_handle(xatp.gpfns, gpfns);
                set_xen_guest_handle(xatp.idxs, idxs);
-- 
Jiandi An
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux 
Foundation Collaborative Project.


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