linux-kernel - Re: [PATCH 1/2] s390: uv: Fix sysfs max number of VCPUs reporting

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Date:   Tue, 19 Jan 2021 17:19:13 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Janosch Frank <frankja@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        thuth@...hat.com, david@...hat.com, borntraeger@...ibm.com,
        imbrenda@...ux.ibm.com, linux-s390@...r.kernel.org,
        gor@...ux.ibm.com, mihajlov@...ux.ibm.com
Subject: Re: [PATCH 1/2] s390: uv: Fix sysfs max number of VCPUs reporting

On Tue, 19 Jan 2021 05:04:01 -0500
Janosch Frank <frankja@...ux.ibm.com> wrote:

> The number reported by the query is N-1 and I think people reading the
> sysfs file would expect N instead. For users creating VMs there's no
> actual difference because KVM's limit is currently below the UV's
> limit.
> 
> The naming of the field is a bit misleading. Number in this context is
> used like ID and starts at 0. The query field denotes the maximum
> number that can be put into the VCPU number field in the "create
> secure CPU" UV call.
> 
> Signed-off-by: Janosch Frank <frankja@...ux.ibm.com>
> Fixes: a0f60f8431999 ("s390/protvirt: Add sysfs firmware interface for Ultravisor information")
> Cc: stable@...r.kernel.org
> ---
>  arch/s390/boot/uv.c        | 2 +-
>  arch/s390/include/asm/uv.h | 4 ++--
>  arch/s390/kernel/uv.c      | 2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)

Acked-by: Cornelia Huck <cohuck@...hat.com>