[Xen-devel] [PATCH] Flag events caused by foreign domains

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

 xen/arch/x86/mm/mem_event.c    |  6 ++++++
 xen/include/public/mem_event.h |  1 +
 2 files changed, 7 insertions(+), 0 deletions(-)


Add a new flag for mem events, as consumers might need to discriminate
foreign domain-caused from guest-caused events. The vcpu field of an
event is bogus from a consumer p.o.v. for foreign domain-caused events.

Also assert that we shouldn't be pausing foreign vcpus.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla>

diff -r 8ad7af68e017 -r 2a4ec2e2ae36 xen/arch/x86/mm/mem_event.c
--- a/xen/arch/x86/mm/mem_event.c
+++ b/xen/arch/x86/mm/mem_event.c
@@ -143,6 +143,12 @@ void mem_event_put_request(struct domain
     front_ring = &med->front_ring;
     req_prod = front_ring->req_prod_pvt;
 
+    if ( current->domain != d )
+    {
+        req->flags |= MEM_EVENT_FLAG_FOREIGN;
+        ASSERT( !(req->flags & MEM_EVENT_FLAG_VCPU_PAUSED) );
+    }
+
     /* Copy request */
     memcpy(RING_GET_REQUEST(front_ring, req_prod), req, sizeof(*req));
     req_prod++;
diff -r 8ad7af68e017 -r 2a4ec2e2ae36 xen/include/public/mem_event.h
--- a/xen/include/public/mem_event.h
+++ b/xen/include/public/mem_event.h
@@ -39,6 +39,7 @@
 #define MEM_EVENT_FLAG_VCPU_PAUSED  (1 << 0)
 #define MEM_EVENT_FLAG_DROP_PAGE    (1 << 1)
 #define MEM_EVENT_FLAG_EVICT_FAIL   (1 << 2)
+#define MEM_EVENT_FLAG_FOREIGN      (1 << 3)
 
 /* Reasons for the memory event request */
 #define MEM_EVENT_REASON_UNKNOWN     0    /* typical reason */

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