* [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB
@ 2026-02-09 15:29 Steffen Eiden
2026-02-09 17:16 ` Claudio Imbrenda
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Steffen Eiden @ 2026-02-09 15:29 UTC (permalink / raw)
To: linux-s390
Cc: kvm, linux-kernel, Christian Borntraeger, Janosch Frank,
Claudio Imbrenda, Andreas Grapentin, Hendrik Brueckner
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@linux.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
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB
2026-02-09 15:29 [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB Steffen Eiden
@ 2026-02-09 17:16 ` Claudio Imbrenda
2026-02-10 9:45 ` Janosch Frank
2026-02-10 14:07 ` Hendrik Brueckner
2 siblings, 0 replies; 4+ messages in thread
From: Claudio Imbrenda @ 2026-02-09 17:16 UTC (permalink / raw)
To: Steffen Eiden
Cc: linux-s390, kvm, linux-kernel, Christian Borntraeger,
Janosch Frank, Andreas Grapentin, Hendrik Brueckner
On Mon, 9 Feb 2026 16:29:25 +0100
Steffen Eiden <seiden@linux.ibm.com> wrote:
> 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@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.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;
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB
2026-02-09 15:29 [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB Steffen Eiden
2026-02-09 17:16 ` Claudio Imbrenda
@ 2026-02-10 9:45 ` Janosch Frank
2026-02-10 14:07 ` Hendrik Brueckner
2 siblings, 0 replies; 4+ messages in thread
From: Janosch Frank @ 2026-02-10 9:45 UTC (permalink / raw)
To: Steffen Eiden, linux-s390
Cc: kvm, linux-kernel, Christian Borntraeger, Claudio Imbrenda,
Andreas Grapentin, Hendrik Brueckner
On 2/9/26 16:29, Steffen Eiden wrote:
> 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@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.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;
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB
2026-02-09 15:29 [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB Steffen Eiden
2026-02-09 17:16 ` Claudio Imbrenda
2026-02-10 9:45 ` Janosch Frank
@ 2026-02-10 14:07 ` Hendrik Brueckner
2 siblings, 0 replies; 4+ messages in thread
From: Hendrik Brueckner @ 2026-02-10 14:07 UTC (permalink / raw)
To: Steffen Eiden
Cc: linux-s390, kvm, linux-kernel, Christian Borntraeger,
Janosch Frank, Claudio Imbrenda, Andreas Grapentin,
Hendrik Brueckner
On Mon, Feb 09, 2026 at 04:29:25PM +0100, Steffen Eiden wrote:
> 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@linux.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;
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2026-02-10 14:07 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2026-02-09 15:29 [PATCH v1 1/1] KVM: s390: Increase permitted SE header size to 1 MiB Steffen Eiden
2026-02-09 17:16 ` Claudio Imbrenda
2026-02-10 9:45 ` Janosch Frank
2026-02-10 14:07 ` Hendrik Brueckner
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