[Stable-7.2.6 13/51] loongarch: mark loongarch_ipi_iocsr re-entrnacy safe

[Michael Tokarev]

From: Alexander Bulekov <alxndr@bu.edu>

loongarch_ipi_iocsr MRs rely on re-entrant IO through the ipi_send
function. As such, mark these MRs re-entrancy-safe.

Fixes: a2e1753b80 ("memory: prevent dma-reentracy issues")
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20230506112145.3563708-1-alxndr@bu.edu>
Signed-off-by: Song Gao <gaosong@loongson.cn>
(cherry picked from commit 6d0589e0e6c64b888864a2bf980537be20389264)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/intc/loongarch_ipi.c b/hw/intc/loongarch_ipi.c
index aa4bf9eb74..40e98af2ce 100644
--- a/hw/intc/loongarch_ipi.c
+++ b/hw/intc/loongarch_ipi.c
@@ -215,6 +215,10 @@ static void loongarch_ipi_init(Object *obj)
     for (cpu = 0; cpu < MAX_IPI_CORE_NUM; cpu++) {
         memory_region_init_io(&s->ipi_iocsr_mem[cpu], obj, &loongarch_ipi_ops,
                             &lams->ipi_core[cpu], "loongarch_ipi_iocsr", 0x48);
+
+        /* loongarch_ipi_iocsr performs re-entrant IO through ipi_send */
+        s->ipi_iocsr_mem[cpu].disable_reentrancy_guard = true;
+
         sysbus_init_mmio(sbd, &s->ipi_iocsr_mem[cpu]);
 
         memory_region_init_io(&s->ipi64_iocsr_mem[cpu], obj, 
&loongarch_ipi64_ops,
-- 
2.39.2