linux-kernel - [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB

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Message-ID: <20260209152925.578872-1-seiden@linux.ibm.com>
Date: Mon,  9 Feb 2026 16:29:25 +0100
From: Steffen Eiden <seiden@...ux.ibm.com>
To: linux-s390@...r.kernel.org
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Andreas Grapentin <gra@...ux.ibm.com>,
        Hendrik Brueckner <brueckner@...ux.ibm.com>
Subject: [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB

Relax the maximum allowed Secure Execution (SE) header size from
8 KiB to 1 MiB. This allows individual secure guest images to run on a
wider range of physical machines.

Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 56a50524b3ee..3428a8d427b2 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2744,9 +2744,9 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
 		if (copy_from_user(&parms, argp, sizeof(parms)))
 			break;
 
-		/* Currently restricted to 8KB */
+		/* Currently restricted to 1MiB */
 		r = -EINVAL;
-		if (parms.length > PAGE_SIZE * 2)
+		if (parms.length > SZ_1M)
 			break;
 
 		r = -ENOMEM;
-- 
2.51.0