[Xen-devel] [PATCH] 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>
---
 drivers/xen/arm-device.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
index 778acf8..208273b 100644
--- a/drivers/xen/arm-device.c
+++ b/drivers/xen/arm-device.c
@@ -87,6 +87,9 @@ static int xen_map_device_mmio(const struct resource 
*resources,
                        idxs[j] = XEN_PFN_DOWN(r->start) + j;
                }
 
+               /* Ensure reserved fields are set to zero */
+               memset(&xatp, 0, sizeof(xatp));
+
                xatp.domid = DOMID_SELF;
                xatp.size = nr;
                xatp.space = XENMAPSPACE_dev_mmio;
-- 
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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