[Xen-devel] [PATCH V2] tests/xen-access: disable CR4 write events on application exit

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On exit, xen-access did not unsubscribe from CR4 write vm_events,
potentially leaving the guest stuck.

Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>

---
Changes since V1:
 - Made all the ignored parameters of xc_monitor_write_ctrlreg() zeroes.
---
 tools/tests/xen-access/xen-access.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/tests/xen-access/xen-access.c 
b/tools/tests/xen-access/xen-access.c
index 9d960e2109..a081168dea 100644
--- a/tools/tests/xen-access/xen-access.c
+++ b/tools/tests/xen-access/xen-access.c
@@ -654,6 +654,8 @@ int main(int argc, char *argv[])
                 rc = xc_monitor_cpuid(xch, domain_id, 0);
             if ( desc_access )
                 rc = xc_monitor_descriptor_access(xch, domain_id, 0);
+            if ( write_ctrlreg_cr4 )
+                rc = xc_monitor_write_ctrlreg(xch, domain_id, 
VM_EVENT_X86_CR4, 0, 0, 0, 0);
 
             if ( privcall )
                 rc = xc_monitor_privileged_call(xch, domain_id, 0);
-- 
2.16.1


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