From b1a633434ddc5fc28de817debd963f7845fb78c7 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Thu, 18 Sep 2014 21:16:47 +0000 Subject: [PATCH] ArmPkg/TimerDxe: add workaround for KVM timer interrupt handling KVM on ARM currently masks the timer interrupt on the timer side when delivering an interrupt to the guest. This itself is a workaround for an issue where the interrupt is reraised and trapped by the host as soon as the guest is entered, resulting in the guest being starved. Work around this by calling ArmGenericTimerEnable () after servicing each interrupt. The virtual version of ArmGenericTimerCounterLib will then make sure to unmask the interrupt again. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel Reviewed-By: Olivier Martin git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16144 6f19259b-4bc3-4df7-8a09-765794883524 --- ArmPkg/Drivers/TimerDxe/TimerDxe.c | 1 + 1 file changed, 1 insertion(+) diff --git a/ArmPkg/Drivers/TimerDxe/TimerDxe.c b/ArmPkg/Drivers/TimerDxe/TimerDxe.c index 2efe0fe493..d0a819fc27 100644 --- a/ArmPkg/Drivers/TimerDxe/TimerDxe.c +++ b/ArmPkg/Drivers/TimerDxe/TimerDxe.c @@ -337,6 +337,7 @@ TimerInterruptHandler ( // Set next compare value ArmGenericTimerSetCompareVal (CompareValue); + ArmGenericTimerEnableTimer (); } // Enable timer interrupts