Re: [Qemu-devel] [PATCH] Fix race resulting in loosing event bit in GPE.1.sts

[Igor Mammedov]

Tried another approach, that involves only seabios change as specified in
acpi50.spec: 5.6.4 General-Purpose Event Handling
by switching from level to edge handler.

diff --git a/src/acpi-dsdt.dsl b/src/acpi-dsdt.dsl
index 4e04c48..51906ad 100644
--- a/src/acpi-dsdt.dsl
+++ b/src/acpi-dsdt.dsl
@@ -723,7 +723,7 @@ DefinitionBlock (
         Method(_L00) {
             Return(0x01)
         }
-        Method(_L01) {
+        Method(_E01) {
             // PCI hotplug event
             Return(\_SB.PCI0.PCNF())
         }

It fixes problem (at least I wasn't able to hit window between GPE00.sts read 
and
GPE00.sts reset, too small interval).
It seems to work as expected with rhel6, 3.3+ kernel, winxp, ws2008r2.
Will post patch to seabios list and hope we won't need this one in qemu.