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[PATCH v15 02/10] x86/shadow: blow away tables first when tearing down
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 28 Jul 2026 16:20:51 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>
- Delivery-date: Tue, 28 Jul 2026 14:20:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
With shadow_blow_tables() but not sh_detach_old_tables() (called by
shadow_vcpu_teardown()) being preemptable, move the invocation of the
former ahead. This way future finer grained preemption checks applied
to shadow_blow_tables() will further benefit teardown behavior.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
v13: New.
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -2279,6 +2279,17 @@ void shadow_teardown(struct domain *d, b
ASSERT(d->is_dying);
ASSERT(d != current->domain);
+ /*
+ * Reclaim all shadow memory so that shadow_set_allocation() doesn't find
+ * in-use pages, as _shadow_prealloc() will no longer try to reclaim pages
+ * because the domain is dying.
+ */
+ paging_lock(d);
+ shadow_blow_tables(d, preempted);
+ paging_unlock(d);
+ if ( preempted && *preempted )
+ return;
+
/* TODO - Remove when the teardown path is better structured. */
for_each_vcpu ( d, v )
shadow_vcpu_teardown(v);
@@ -2289,15 +2300,6 @@ void shadow_teardown(struct domain *d, b
paging_lock(d);
- /*
- * Reclaim all shadow memory so that shadow_set_allocation() doesn't find
- * in-use pages, as _shadow_prealloc() will no longer try to reclaim pages
- * because the domain is dying.
- */
- shadow_blow_tables(d, preempted);
- if ( preempted && *preempted )
- goto out;
-
#if (SHADOW_OPTIMIZATIONS & (SHOPT_VIRTUAL_TLB|SHOPT_OUT_OF_SYNC))
/* Free the virtual-TLB array attached to each vcpu */
for_each_vcpu(d, v)
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