From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Wed, 3 Feb 2016 10:12:34 +0000 (+0100)
Subject: KVM: s390: bail out early on fatal signal in dirty logging
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1763f8d09d522b3ac998229dcf038476e88b78fc;p=linux-beck.git

KVM: s390: bail out early on fatal signal in dirty logging

A KVM_GET_DIRTY_LOG ioctl might take a long time.
This can result in fatal signals seemingly being ignored.
Lets bail out during the dirty bit sync, if a fatal signal
is pending.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index bb99ca28eb66..28bd5ea1b08f 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -281,6 +281,8 @@ static void kvm_s390_sync_dirty_log(struct kvm *kvm,
 
 		if (gmap_test_and_clear_dirty(address, gmap))
 			mark_page_dirty(kvm, cur_gfn);
+		if (fatal_signal_pending(current))
+			return;
 		cond_resched();
 	}
 }