linux-kernel - [PATCH v6 06/28] KVM: s390: Introduce import

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251222165033.162329-7-imbrenda@linux.ibm.com>
Date: Mon, 22 Dec 2025 17:50:11 +0100
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        borntraeger@...ibm.com, frankja@...ux.ibm.com, nsg@...ux.ibm.com,
        nrb@...ux.ibm.com, seiden@...ux.ibm.com, gra@...ux.ibm.com,
        schlameuss@...ux.ibm.com, hca@...ux.ibm.com, svens@...ux.ibm.com,
        agordeev@...ux.ibm.com, gor@...ux.ibm.com, david@...hat.com,
        gerald.schaefer@...ux.ibm.com
Subject: [PATCH v6 06/28] KVM: s390: Introduce import_lock

Introduce import_lock to avoid future races when converting pages to
secure.

Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
---
 arch/s390/include/asm/kvm_host.h | 2 ++
 arch/s390/kvm/kvm-s390.c         | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index ae1223264d3c..3dbddb7c60a9 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -630,6 +630,8 @@ struct kvm_s390_pv {
 	void *set_aside;
 	struct list_head need_cleanup;
 	struct mmu_notifier mmu_notifier;
+	/* Protects against concurrent import-like operations */
+	struct mutex import_lock;
 };
 
 struct kvm_arch {
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 56a50524b3ee..cd39b2f099ca 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3330,6 +3330,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 	char debug_name[16];
 	int i, rc;
 
+	mutex_init(&kvm->arch.pv.import_lock);
+
 	rc = -EINVAL;
 #ifdef CONFIG_KVM_S390_UCONTROL
 	if (type & ~KVM_VM_S390_UCONTROL)
-- 
2.52.0