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From: Carsten Otte <cotte@de.ibm.com>
To: Avi Kivity <avi@redhat.com>, Marcelo Tossati <mtosatti@redhat.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Cornelia Huck <cornelia.huck@de.ibm.com>,
	KVM <kvm@vger.kernel.org>,
	Joachim von Buttlar <joachim_von_buttlar@de.ibm.com>,
	Jens Freimann <jfrei@de.ibm.com>,
	Constantin Werner <constantin.werner@de.ibm.com>
Subject: [patch 08/12] [PATCH] kvm-s390-ucontrol: disable sca
Date: Thu, 01 Dec 2011 13:57:40 +0100	[thread overview]
Message-ID: <20111201130409.653965704@de.ibm.com> (raw)
In-Reply-To: 20111201125732.085553111@de.ibm.com

[-- Attachment #1: do-not-add-ucontrol-cpus-to-sca.patch --]
[-- Type: text/plain, Size: 2061 bytes --]

This patch makes sure user controlled virtual machines do not use a
system control area (sca). This is needed in order to create
virtual machines with more cpus than the size of the sca [64].

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
---
Index: linux-2.5-cecsim/arch/s390/kvm/kvm-s390.c
===================================================================
--- linux-2.5-cecsim.orig/arch/s390/kvm/kvm-s390.c
+++ linux-2.5-cecsim/arch/s390/kvm/kvm-s390.c
@@ -244,10 +244,13 @@ out_err:
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 {
 	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
-	clear_bit(63 - vcpu->vcpu_id, (unsigned long *) &vcpu->kvm->arch.sca->mcn);
-	if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
-		(__u64) vcpu->arch.sie_block)
-		vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
+	if (!kvm_is_ucontrol(vcpu->kvm)) {
+		clear_bit(63 - vcpu->vcpu_id,
+			  (unsigned long *) &vcpu->kvm->arch.sca->mcn);
+		if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
+		    (__u64) vcpu->arch.sie_block)
+			vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
+	}
 	smp_mb();
 
 	if (kvm_is_ucontrol(vcpu->kvm))
@@ -384,12 +387,19 @@ struct kvm_vcpu *kvm_arch_vcpu_create(st
 		goto out_free_cpu;
 
 	vcpu->arch.sie_block->icpua = id;
-	BUG_ON(!kvm->arch.sca);
-	if (!kvm->arch.sca->cpu[id].sda)
-		kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
-	vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32);
-	vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
-	set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
+	if (!kvm_is_ucontrol(kvm)) {
+		if (!kvm->arch.sca) {
+			WARN_ON_ONCE(1);
+			goto out_free_cpu;
+		}
+		if (!kvm->arch.sca->cpu[id].sda)
+			kvm->arch.sca->cpu[id].sda =
+				(__u64) vcpu->arch.sie_block;
+		vcpu->arch.sie_block->scaoh =
+			(__u32)(((__u64)kvm->arch.sca) >> 32);
+		vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
+		set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
+	}
 
 	spin_lock_init(&vcpu->arch.local_int.lock);
 	INIT_LIST_HEAD(&vcpu->arch.local_int.list);


  parent reply	other threads:[~2011-12-01 13:04 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-01 12:57 [patch 00/12] User controlled virtual machines Carsten Otte
2011-12-01 12:57 ` [patch 01/12] [PATCH] kvm-s390: ioctl to switch to user " Carsten Otte
2011-12-01 13:15   ` Avi Kivity
2011-12-01 13:31     ` Avi Kivity
2011-12-01 14:20     ` Martin Schwidefsky
2011-12-01 12:57 ` [patch 02/12] [PATCH] kvm-s390-ucontrol: per vcpu address spaces Carsten Otte
2011-12-01 13:19   ` Avi Kivity
2011-12-01 12:57 ` [patch 03/12] [PATCH] kvm-s390-ucontrol: export page faults to user Carsten Otte
2011-12-01 12:57 ` [patch 04/12] [PATCH] kvm-s390-ucontrol: export SIE control block " Carsten Otte
2011-12-01 13:25   ` Avi Kivity
2011-12-01 13:26   ` Avi Kivity
2011-12-01 13:59     ` Carsten Otte
2011-12-01 14:04       ` Avi Kivity
2011-12-01 12:57 ` [patch 05/12] [PATCH] kvm-s390-ucontrol: disable in-kernel handling of SIE intercepts Carsten Otte
2011-12-01 12:57 ` [patch 06/12] [PATCH] kvm-s390-ucontrol: disable in-kernel irq stack Carsten Otte
2011-12-01 12:57 ` [patch 07/12] [PATCH] kvm-s390-ucontrol: interface to inject faults on a vcpu page table Carsten Otte
2011-12-01 12:57 ` Carsten Otte [this message]
2011-12-01 12:57 ` [patch 09/12] [PATCH] kvm-s390: fix assumption for KVM_MAX_VCPUS Carsten Otte
2011-12-01 12:57 ` [patch 10/12] [PATCH] kvm-s390: storage key interface Carsten Otte
2011-12-01 12:57 ` [patch 11/12] [PATCH] kvm-s390-ucontrol: announce capability for user controlled vms Carsten Otte
2011-12-01 12:57 ` [patch 12/12] From: Carsten Otte <cotte@de.ibm.com> Carsten Otte
2011-12-01 13:10 ` [patch 00/12] User controlled virtual machines Avi Kivity
2011-12-01 13:33   ` Avi Kivity
2011-12-02 11:52     ` Carsten Otte
  -- strict thread matches above, loose matches on Subject: below --
2011-12-08  9:12 [patch 00/12] Ucontrol patchset V2 Carsten Otte
2011-12-08  9:12 ` [patch 08/12] [PATCH] kvm-s390-ucontrol: disable sca Carsten Otte
2011-12-09 11:23 [patch 00/12] Ucontrol patches V3 Carsten Otte
2011-12-09 11:23 ` [patch 08/12] [PATCH] kvm-s390-ucontrol: disable sca Carsten Otte
2011-12-09 12:49 [patch 00/12] Ucontrol patchset V4 Carsten Otte
2011-12-09 12:49 ` [patch 08/12] [PATCH] kvm-s390-ucontrol: disable sca Carsten Otte
2011-12-10 12:35 [patch 00/12] Ucontrol patchset V5 Carsten Otte
2011-12-10 12:35 ` [patch 08/12] [PATCH] kvm-s390-ucontrol: disable sca Carsten Otte
2011-12-14 12:23 [patch 00/12] Ucontrol patchset V6 Carsten Otte
2011-12-14 12:23 ` [patch 08/12] [PATCH] kvm-s390-ucontrol: disable sca Carsten Otte

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