[win-pv-devel] [PATCH] __DbgPrintEnable() cannot be called on paging path

[Paul Durrant <pdurrant@xxxxxxxxx>]

The system power up code in XENFILT re-enables DbgPrint hooking.
Unfortunately the undocumented kernel call it uses may require a page-in
and so causes a deadlock when XENVBD is responsible for the page file,
since it depends upon XENFILT to power up.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
 src/xenfilt/fdo.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/xenfilt/fdo.c b/src/xenfilt/fdo.c
index 4736ac7..1597a15 100644
--- a/src/xenfilt/fdo.c
+++ b/src/xenfilt/fdo.c
@@ -1457,10 +1457,6 @@ FdoSetSystemPowerUp(
           SystemPowerStateName(__FdoGetSystemPowerState(Fdo)),
           SystemPowerStateName(SystemState));
 
-    if (SystemState < PowerSystemHibernate &&
-        __FdoGetSystemPowerState(Fdo) >= PowerSystemHibernate)
-        __DbgPrintEnable();
-
     __FdoSetSystemPowerState(Fdo, SystemState);
 
 done:
-- 
2.1.1


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