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[PATCH v3 5/6] x86: New feature flag XENFEAT_mmu_pt_update_swap.
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Kevin Lampis <kevin.lampis@xxxxxxxxxx>
- Date: Thu, 1 Oct 2026 18:47:48 +0100
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- Cc: jbeulich@xxxxxxxx, andrew.cooper3@xxxxxxxxxx, teddy.astie@xxxxxxxxxx, Kevin Lampis <kevin.lampis@xxxxxxxxxx>
- Delivery-date: Thu, 01 Oct 2026 17:46:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Signed-off-by: Kevin Lampis <kevin.lampis@xxxxxxxxxx>
---
Changes in v3:
- Reduce diff size
Changes in v2:
- New patch
---
xen/common/kernel.c | 1 +
xen/include/public/features.h | 3 +++
2 files changed, 4 insertions(+)
diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index f4bbd8818fa8..67b56ba302cf 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -691,6 +691,7 @@ long do_xen_version(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
#ifdef CONFIG_X86
if ( is_pv_domain(d) )
fi.submap |= (1U << XENFEAT_mmu_pt_update_preserve_ad) |
+ (1U << XENFEAT_mmu_pt_update_swap) |
(1U << XENFEAT_highmem_assist) |
(1U << XENFEAT_gnttab_map_avail_bits);
else
diff --git a/xen/include/public/features.h b/xen/include/public/features.h
index 880193094713..227f1e408e41 100644
--- a/xen/include/public/features.h
+++ b/xen/include/public/features.h
@@ -128,6 +128,9 @@
*/
#define XENFEAT_dm_msix_all_writes 20
+/* x86: Does this Xen host support the MMU_PT_UPDATE_SWAP hypercall? */
+#define XENFEAT_mmu_pt_update_swap 21
+
#define XENFEAT_NR_SUBMAPS 1
#endif /* __XEN_PUBLIC_FEATURES_H__ */
--
2.52.0
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