[PATCH 01/13] hw/mips/gt64xxx_pci: Fix PCI IRQ levels to be preserved during migration

["Philippe Mathieu-Daudé" <philippe.mathieu.daude@gmail.com>]

From: Bernhard Beschow <shentey@gmail.com>

Based on commit e735b55a8c11dd455e31ccd4420e6c9485191d0c:

  piix_pci: eliminate PIIX3State::pci_irq_levels

  PIIX3State::pci_irq_levels are redundant which is already tracked by
  PCIBus layer. So eliminate them.

The IRQ levels in the PCIBus layer are already preserved during
migration. By reusing them and rather than having a redundant implementation
the bug is avoided in the first place.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220217101924.15347-2-shentey@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/mips/gt64xxx_pci.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/hw/mips/gt64xxx_pci.c b/hw/mips/gt64xxx_pci.c
index c7480bd019..4cbd0911f5 100644
--- a/hw/mips/gt64xxx_pci.c
+++ b/hw/mips/gt64xxx_pci.c
@@ -1006,14 +1006,11 @@ static int gt64120_pci_map_irq(PCIDevice *pci_dev, int irq_num)
     }
 }
 
-static int pci_irq_levels[4];
-
 static void gt64120_pci_set_irq(void *opaque, int irq_num, int level)
 {
     int i, pic_irq, pic_level;
     qemu_irq *pic = opaque;
-
-    pci_irq_levels[irq_num] = level;
+    PCIBus *bus = pci_get_bus(piix4_dev);
 
     /* now we change the pic irq level according to the piix irq mappings */
     /* XXX: optimize */
@@ -1023,7 +1020,7 @@ static void gt64120_pci_set_irq(void *opaque, int irq_num, int level)
         pic_level = 0;
         for (i = 0; i < 4; i++) {
             if (pic_irq == piix4_dev->config[PIIX_PIRQCA + i]) {
-                pic_level |= pci_irq_levels[i];
+                pic_level |= pci_bus_get_irq_level(bus, i);
             }
         }
         qemu_set_irq(pic[pic_irq], pic_level);
-- 
2.34.1