linux-kernel - [PATCH 3.2 011/152] KVM: s390: flush CPU on load control

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Message-ID: <lsq.1424137613.831693809@decadent.org.uk>
Date:	Tue, 17 Feb 2015 01:46:53 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Christian Borntraeger" <borntraeger@...ibm.com>,
	"Cornelia Huck" <cornelia.huck@...ibm.com>,
	"David Hildenbrand" <dahi@...ux.vnet.ibm.com>
Subject: [PATCH 3.2 011/152] KVM: s390: flush CPU on load control

3.2.67-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Christian Borntraeger <borntraeger@...ibm.com>

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@...ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@...ibm.com>
Reviewed-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/s390/kvm/intercept.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -58,6 +58,7 @@ static int handle_lctlg(struct kvm_vcpu
 			break;
 		reg = (reg + 1) % 16;
 	} while (1);
+	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 	return 0;
 }
 
@@ -97,6 +98,7 @@ static int handle_lctl(struct kvm_vcpu *
 			break;
 		reg = (reg + 1) % 16;
 	} while (1);
+	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 	return 0;
 }
 

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