This is a note to let you know that I've just added the patch titled
KVM: s390: flush CPU on load control
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-s390-flush-cpu-on-load-control.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2dca485f8740208604543c3960be31a5dd3ea603 Mon Sep 17 00:00:00 2001
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Date: Fri, 31 Oct 2014 09:24:20 +0100
Subject: KVM: s390: flush CPU on load control
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
commit 2dca485f8740208604543c3960be31a5dd3ea603 upstream.
some control register changes will flush some aspects of the CPU, e.g.
POP explicitely mentions that for CR9-CR11 "TLBs may be cleared".
Instead of trying to be clever and only flush on specific CRs, let
play safe and flush on all lctl(g) as future machines might define
new bits in CRs. Load control intercept should not happen that often.
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Acked-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kvm/priv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -791,7 +791,7 @@ int kvm_s390_handle_lctl(struct kvm_vcpu
break;
reg = (reg + 1) % 16;
} while (1);
-
+ kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
return 0;
}
@@ -863,7 +863,7 @@ static int handle_lctlg(struct kvm_vcpu
break;
reg = (reg + 1) % 16;
} while (1);
-
+ kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
return 0;
}
Patches currently in stable-queue which might be from borntraeger@xxxxxxxxxx are
queue-3.18/kvm-s390-fix-ipte-locking.patch
queue-3.18/kvm-s390-fix-size-of-monitor-class-number-field.patch
queue-3.18/kvm-s390-flush-cpu-on-load-control.patch
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