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[PATCH 1/4] x86/guest: move allocation of Xen upcall vector to init code
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 19 Nov 2025 11:50:04 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 19 Nov 2025 10:50:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
There's no need to do this every time init_evtchn() is called. Just do it
once when setting up CPU0. Drop the assertion as well, as
alloc_hipriority_vector() (called by alloc_direct_apic_vector()) uses more
restrictive BUG_ON() anyway. Then evtchn_upcall_vector can also validly
become ro-after-init, just that it needs to move out of init_evtchn().
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/guest/xen/xen.c
+++ b/xen/arch/x86/guest/xen/xen.c
@@ -233,16 +233,12 @@ static void cf_check xen_evtchn_upcall(v
ack_APIC_irq();
}
+static uint8_t __ro_after_init evtchn_upcall_vector;
+
static int init_evtchn(void)
{
- static uint8_t evtchn_upcall_vector;
int rc;
- if ( !evtchn_upcall_vector )
- alloc_direct_apic_vector(&evtchn_upcall_vector, xen_evtchn_upcall);
-
- ASSERT(evtchn_upcall_vector);
-
rc = xen_hypercall_set_evtchn_upcall_vector(this_cpu(vcpu_id),
evtchn_upcall_vector);
if ( rc )
@@ -293,6 +289,8 @@ static void __init cf_check setup(void)
XEN_LEGACY_MAX_VCPUS);
}
+ alloc_direct_apic_vector(&evtchn_upcall_vector, xen_evtchn_upcall);
+
BUG_ON(init_evtchn());
}
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