[Xen-changelog] [xen master] x86/vm_event: reset monitor in vm_event_cleanup_domain()

[patchbot@xxxxxxx]

commit b848dc83cc3f500a9d9f7ebcf16eece7f31566ba
Author:     Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
AuthorDate: Fri Jan 29 17:50:05 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jan 29 17:50:05 2016 +0100

    x86/vm_event: reset monitor in vm_event_cleanup_domain()
    
    It is currently possible to leave a monitor flag enabled even
    after vm_event_cleanup_domain() has been called, potentially
    leading to a crash in hvm_msr_write_intercept() and hvm_set_crX()
    (when v->arch.vm_event has become NULL, but the corresponding
    corresponding v->domain->arch.monitor flag is non-zero).
    This patch zeroes out arch.monitor in vm_event_cleanup_domain().
    
    Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
---
 xen/arch/x86/vm_event.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/vm_event.c b/xen/arch/x86/vm_event.c
index 9677ecc..08d678a 100644
--- a/xen/arch/x86/vm_event.c
+++ b/xen/arch/x86/vm_event.c
@@ -56,6 +56,7 @@ void vm_event_cleanup_domain(struct domain *d)
     }
 
     d->arch.mem_access_emulate_each_rep = 0;
+    memset(&d->arch.monitor, 0, sizeof(d->arch.monitor));
 }
 
 void vm_event_toggle_singlestep(struct domain *d, struct vcpu *v)
--
generated by git-patchbot for /home/xen/git/xen.git#master

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