[PATCH v2 2/2] xen/mm: reject XENMEM_claim_pages when using LLC coloring

[Roger Pau Monne]

The coloring allocator ignores claims, reject the usage of the hypercall if
LLC coloring is enabled.  Note that the usage of alloc_color_heap_page() is
selected at boot time, and it's a system wide decision.  Once enabled all
domains will use alloc_color_heap_page() for allocations, which ignores any
outstanding claims.

The hypercall can be enabled if/when LLC coloring is adjusted to support
claims.

Fixes: 95debe51a936 ("xen: add cache coloring allocator for domains")
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
 xen/common/memory.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/common/memory.c b/xen/common/memory.c
index ae805ccbe4d1..3d978227276a 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -1660,6 +1660,9 @@ long do_memory_op(unsigned long cmd, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         break;
 
     case XENMEM_claim_pages:
+        if ( llc_coloring_enabled )
+            return -EOPNOTSUPP;
+
         if ( unlikely(start_extent) )
             return -EINVAL;
 
-- 
2.51.0