File 0283-lsi53c895a-disable-reentrancy-detec.patch of Package qemu

From: Thomas Huth <thuth@redhat.com>
Date: Tue, 16 May 2023 11:05:56 +0200
Subject: lsi53c895a: disable reentrancy detection for MMIO region, too

Git-commit: d139fe9ad8a27bcc50b4ead77d2f97d191a0e95e
References: bsc#1223955

While trying to use a SCSI disk on the LSI controller with an
older version of Fedora (25), I'm getting:

 qemu: warning: Blocked re-entrant IO on MemoryRegion: lsi-mmio at addr: 0x34

and the SCSI controller is not usable. Seems like we have to
disable the reentrancy checker for the MMIO region, too, to
get this working again.

The problem could be reproduced it like this:

./qemu-system-x86_64 -accel kvm -m 2G -machine q35 \
 -device lsi53c810,id=lsi1 -device scsi-hd,drive=d0 \
 -drive if=none,id=d0,file=.../somedisk.qcow2 \
 -cdrom Fedora-Everything-netinst-i386-25-1.3.iso

Where somedisk.qcow2 is an image that contains already some partitions
and file systems.

In the boot menu of Fedora, go to
"Troubleshooting" -> "Rescue a Fedora system" -> "3) Skip to shell"

Then check "dmesg | grep -i 53c" for failure messages, and try to mount
a partition from somedisk.qcow2.

Message-Id: <20230516090556.553813-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
 hw/scsi/lsi53c895a.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index 88a8c5ca981babc60e98b5ec527f..b0b671be142efeda6ddf82cafa14 100644
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -2288,6 +2288,7 @@ static void lsi_scsi_realize(PCIDevice *dev, Error **errp)
      * re-entrancy guard.
      */
     s->ram_io.disable_reentrancy_guard = true;
+    s->mmio_io.disable_reentrancy_guard = true;
 
     address_space_init(&s->pci_io_as, pci_address_space_io(dev), "lsi-pci-io");
     qdev_init_gpio_out(d, &s->ext_irq, 1);