From: Claudio Imbrenda <imbrenda@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: cohuck@redhat.com, borntraeger@de.ibm.com, frankja@linux.ibm.com,
thuth@redhat.com, pasic@linux.ibm.com, david@redhat.com,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
Ulrich.Weigand@de.ibm.com
Subject: [PATCH v4 10/14] KVM: s390: pv: usage counter instead of flag
Date: Wed, 18 Aug 2021 15:26:16 +0200 [thread overview]
Message-ID: <20210818132620.46770-11-imbrenda@linux.ibm.com> (raw)
In-Reply-To: <20210818132620.46770-1-imbrenda@linux.ibm.com>
Use the is_protected field as a counter instead of a flag. This will
be used in upcoming patches.
Increment the counter when a secure configuration is created, and
decrement it when it is destroyed. Previously the flag was set when the
set secure parameters UVC was performed.
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
---
arch/s390/kvm/pv.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 47db80003ea0..ee11ff6afc4f 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -173,7 +173,8 @@ int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
cc = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
UVC_CMD_DESTROY_SEC_CONF, rc, rrc);
WRITE_ONCE(kvm->arch.gmap->guest_handle, 0);
- atomic_set(&kvm->mm->context.is_protected, 0);
+ if (!cc)
+ atomic_dec(&kvm->mm->context.is_protected);
KVM_UV_EVENT(kvm, 3, "PROTVIRT DESTROY VM: rc %x rrc %x", *rc, *rrc);
WARN_ONCE(cc, "protvirt destroy vm failed rc %x rrc %x", *rc, *rrc);
/* Intended memory leak on "impossible" error */
@@ -214,11 +215,14 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
/* Outputs */
kvm->arch.pv.handle = uvcb.guest_handle;
+ atomic_inc(&kvm->mm->context.is_protected);
if (cc) {
- if (uvcb.header.rc & UVC_RC_NEED_DESTROY)
+ if (uvcb.header.rc & UVC_RC_NEED_DESTROY) {
kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);
- else
+ } else {
+ atomic_dec(&kvm->mm->context.is_protected);
kvm_s390_pv_dealloc_vm(kvm);
+ }
return -EIO;
}
kvm->arch.gmap->guest_handle = uvcb.guest_handle;
@@ -241,8 +245,6 @@ int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc,
*rrc = uvcb.header.rrc;
KVM_UV_EVENT(kvm, 3, "PROTVIRT VM SET PARMS: rc %x rrc %x",
*rc, *rrc);
- if (!cc)
- atomic_set(&kvm->mm->context.is_protected, 1);
return cc ? -EINVAL : 0;
}
--
2.31.1
next prev parent reply other threads:[~2021-08-18 13:27 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-18 13:26 [PATCH v4 00/14] KVM: s390: pv: implement lazy destroy for reboot Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 01/14] KVM: s390: pv: add macros for UVC CC values Claudio Imbrenda
2021-08-31 13:43 ` Christian Borntraeger
2021-08-18 13:26 ` [PATCH v4 02/14] KVM: s390: pv: avoid double free of sida page Claudio Imbrenda
2021-08-31 13:55 ` Christian Borntraeger
2021-09-08 18:50 ` Claudio Imbrenda
2021-08-31 13:59 ` Janosch Frank
2021-08-18 13:26 ` [PATCH v4 03/14] KVM: s390: pv: avoid stalls for kvm_s390_pv_init_vm Claudio Imbrenda
2021-08-31 14:10 ` Christian Borntraeger
2021-08-18 13:26 ` [PATCH v4 04/14] KVM: s390: pv: avoid stalls when making pages secure Claudio Imbrenda
2021-08-31 14:32 ` Christian Borntraeger
2021-08-31 15:00 ` Claudio Imbrenda
2021-08-31 15:11 ` Christian Borntraeger
2021-08-18 13:26 ` [PATCH v4 05/14] KVM: s390: pv: leak the ASCE page when destroy fails Claudio Imbrenda
2021-09-06 15:32 ` Christian Borntraeger
2021-09-06 15:54 ` Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 06/14] KVM: s390: pv: properly handle page flags for protected guests Claudio Imbrenda
2021-09-06 15:46 ` Christian Borntraeger
2021-09-06 15:56 ` Claudio Imbrenda
2021-09-06 16:16 ` Christian Borntraeger
2021-09-17 14:57 ` Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 07/14] KVM: s390: pv: handle secure storage violations " Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 08/14] KVM: s390: pv: handle secure storage exceptions for normal guests Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 09/14] KVM: s390: pv: refactor s390_reset_acc Claudio Imbrenda
2021-08-18 13:26 ` Claudio Imbrenda [this message]
2021-08-26 7:58 ` [PATCH v4 10/14] KVM: s390: pv: usage counter instead of flag Janis Schoetterl-Glausch
2021-08-18 13:26 ` [PATCH v4 11/14] KVM: s390: pv: add export before import Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 12/14] KVM: s390: pv: module parameter to fence lazy destroy Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 13/14] KVM: s390: pv: lazy destroy for reboot Claudio Imbrenda
2021-08-26 8:33 ` Janis Schoetterl-Glausch
2021-08-18 13:26 ` [PATCH v4 14/14] KVM: s390: pv: avoid export before import if possible Claudio Imbrenda
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