linux-kernel - Re: [PATCH] KVM: s390: Fix handle

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Date:   Fri, 22 Oct 2021 14:11:40 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Janis Schoetterl-Glausch <scgl@...ux.ibm.com>
Cc:     Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: s390: Fix handle_sske page fault handling

On Fri, 22 Oct 2021 13:29:13 +0200
Janis Schoetterl-Glausch <scgl@...ux.ibm.com> wrote:

> Retry if fixup_user_fault succeeds.
> The same issue in handle_pfmf was fixed by
> a11bdb1a6b78 (KVM: s390: Fix pfmf and conditional skey emulation).
> 
> Fixes: bd096f644319 ("KVM: s390: Add skey emulation fault handling")
> Signed-off-by: Janis Schoetterl-Glausch <scgl@...ux.ibm.com>

with the description fixed as indicated by Christian:

Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

> ---
>  arch/s390/kvm/priv.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
> index 53da4ceb16a3..417154b314a6 100644
> --- a/arch/s390/kvm/priv.c
> +++ b/arch/s390/kvm/priv.c
> @@ -397,6 +397,8 @@ static int handle_sske(struct kvm_vcpu *vcpu)
>  		mmap_read_unlock(current->mm);
>  		if (rc == -EFAULT)
>  			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
> +		if (rc == -EAGAIN)
> +			continue;
>  		if (rc < 0)
>  			return rc;
>  		start += PAGE_SIZE;