[Xen-devel] [PATCH] mem_event: fix regression affecting CR0 memory events

[Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>]

This is a patch repairing a regression in code previously functional in 4.1.x.
It appears that, during some refactoring work, call to hvm_memory_event_cr0 was 
lost.

This function was originally called in mov_to_cr() of vmx.c, but the commit
http://xenbits.xen.org/hg/xen-unstable.hg/rev/1276926e3795 abstracted the
original code into generic functions up a level in hvm.c, dropping the call
in the process.

The same issue affected the CR3 and CR4 events, which were fixed in patch
http://xenbits.xensource.com/hg/xen-unstable.hg/rev/7ab899e46347.

Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index ef2411c..d922237 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3200,6 +3200,7 @@ int hvm_set_cr0(unsigned long value)
         hvm_funcs.handle_cd(v, value);
 
     hvm_update_cr(v, 0, value);
+    hvm_memory_event_cr0(value, old_value);
 
     if ( (value ^ old_value) & X86_CR0_PG ) {
         if ( !nestedhvm_vmswitch_in_progress(v) && 
nestedhvm_vcpu_in_guestmode(v) )
-- 
2.0.0


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