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[PULL 07/10] pnv_lpc: disable reentrancy detection for lpc-hc


From: Daniel Henrique Barboza
Subject: [PULL 07/10] pnv_lpc: disable reentrancy detection for lpc-hc
Date: Sun, 28 May 2023 13:49:19 -0300

From: Alexander Bulekov <alxndr@bu.edu>

As lpc-hc is designed for re-entrant calls from xscom, mark it
re-entrancy safe.

Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
[clg: mark opb_master_regs as re-entrancy safe also ]
Signed-off-by: C├ędric Le Goater <clg@kaod.org>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230526073850.2772197-1-clg@kaod.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/ppc/pnv_lpc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/ppc/pnv_lpc.c b/hw/ppc/pnv_lpc.c
index 01f44c19eb..605d390861 100644
--- a/hw/ppc/pnv_lpc.c
+++ b/hw/ppc/pnv_lpc.c
@@ -734,10 +734,13 @@ static void pnv_lpc_realize(DeviceState *dev, Error 
**errp)
     /* Create MMIO regions for LPC HC and OPB registers */
     memory_region_init_io(&lpc->opb_master_regs, OBJECT(dev), &opb_master_ops,
                           lpc, "lpc-opb-master", LPC_OPB_REGS_OPB_SIZE);
+    lpc->opb_master_regs.disable_reentrancy_guard = true;
     memory_region_add_subregion(&lpc->opb_mr, LPC_OPB_REGS_OPB_ADDR,
                                 &lpc->opb_master_regs);
     memory_region_init_io(&lpc->lpc_hc_regs, OBJECT(dev), &lpc_hc_ops, lpc,
                           "lpc-hc", LPC_HC_REGS_OPB_SIZE);
+    /* xscom writes to lpc-hc. As such mark lpc-hc re-entrancy safe */
+    lpc->lpc_hc_regs.disable_reentrancy_guard = true;
     memory_region_add_subregion(&lpc->opb_mr, LPC_HC_REGS_OPB_ADDR,
                                 &lpc->lpc_hc_regs);
 
-- 
2.40.1




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