File 0280-apic-disable-reentrancy-detection-f.patch of Package qemu

From: Alexander Bulekov <alxndr@bu.edu>
Date: Thu, 27 Apr 2023 17:10:13 -0400
Subject: apic: disable reentrancy detection for apic-msi

Git-commit: 50795ee051a342c681a9b45671c552fbd6274db8
References: bsc#1223955

As the code is designed for re-entrant calls to apic-msi, mark apic-msi
as reentrancy-safe.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20230427211013.2994127-9-alxndr@bu.edu>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
 hw/intc/apic.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/intc/apic.c b/hw/intc/apic.c
index 97ffdd820f239dbd3d5bc0549ae5..0d0212b1adb81045030918c98691 100644
--- a/hw/intc/apic.c
+++ b/hw/intc/apic.c
@@ -894,6 +894,13 @@ static void apic_realize(DeviceState *dev, Error **errp)
     memory_region_init_io(&s->io_memory, OBJECT(s), &apic_io_ops, s, "apic-msi",
                           APIC_SPACE_SIZE);
 
+    /*
+     * apic-msi's apic_mem_write can call into ioapic_eoi_broadcast, which can
+     * write back to apic-msi. As such mark the apic-msi region re-entrancy
+     * safe.
+     */
+    s->io_memory.disable_reentrancy_guard = true;
+
     s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, apic_timer, s);
     local_apics[s->id] = s;