acpi: ich9: allow guest to clear SCI rised by GPE

it fixes IRQ storm since guest isn't able to lower SCI IRQ
after it has been handled when it clears GPE event.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index dcdef7c923ccda3884405a17428fb4e09cf7379e..30f0df871332c6dd8fd8a1948b27b72270f48157 100644 (file)
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -61,6 +61,7 @@ static void ich9_gpe_writeb(void *opaque, hwaddr addr, uint64_t val,
 {
     ICH9LPCPMRegs *pm = opaque;
     acpi_gpe_ioport_writeb(&pm->acpi_regs, addr, val);
+    acpi_update_sci(&pm->acpi_regs, pm->irq);
 }
 
 static const MemoryRegionOps ich9_gpe_ops = {