linux-kernel - Re: [PATCH v5 1/7] s390/uv: Always export uv

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Message-ID: <08ed39eb-b1cf-7c15-83a4-dd59cc29732b@linux.ibm.com>
Date:   Fri, 16 Jun 2023 10:56:17 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Steffen Eiden <seiden@...ux.ibm.com>, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>
Subject: Re: [PATCH v5 1/7] s390/uv: Always export uv_info

On 6/15/23 12:05, Steffen Eiden wrote:
> KVM needs the struct's values to be able to provide PV support.
> 
> The uvdevice is currently guest only and will need the struct's values
> for call support checking and potential future expansions.
> 
> As uv.c is only compiled with CONFIG_PGSTE or
> CONFIG_PROTECTED_VIRTUALIZATION_GUEST we don't need a second check in
> the code. Users of uv_info will need to fence for these two config
> options for the time being.
> 
> Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>
> 
Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>

In the long term we'll remove the config checks and always compile uv.o 
in kernel/ and boot/ so we won't be running in these issues again.