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[PATCH v2 2/2] xen/mm: reject XENMEM_claim_pages when using LLC coloring
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Wed, 24 Dec 2025 20:40:35 +0100
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Wed, 24 Dec 2025 19:40:58 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.pau@xxxxxxxxxx>
---
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
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