linux-kernel - Re: [PATCH v2] KVM: introduce kvm_arch_vcpu_async

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Date:   Wed, 13 Dec 2017 10:41:39 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        christoffer.dall@...aro.org, James Hogan <jhogan@...nel.org>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v2] KVM: introduce kvm_arch_vcpu_async_ioctl

On Wed, 13 Dec 2017 10:35:57 +0100
Paolo Bonzini <pbonzini@...hat.com> wrote:

> After the vcpu_load/vcpu_put pushdown, the handling of asynchronous VCPU
> ioctl is already much clearer in that it is obvious that they bypass
> vcpu_load and vcpu_put.
> 
> However, it is still not perfect in that the different state of the VCPU
> mutex is still hidden in the caller.  Separate those ioctls into a new
> function kvm_arch_vcpu_async_ioctl that returns -ENOIOCTLCMD for more
> "traditional" synchronous ioctls.
> 
> Cc: James Hogan <jhogan@...nel.org>
> Cc: Paul Mackerras <paulus@...abs.org>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> Reviewed-by: Christoffer Dall <christoffer.dall@...aro.org>
> Reviewed-by: Cornelia Huck <cohuck@...hat.com>
> Suggested-by: Cornelia Huck <cohuck@...hat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/mips/kvm/Kconfig      |  1 +
>  arch/mips/kvm/mips.c       | 15 ++++++++++++---
>  arch/powerpc/kvm/Kconfig   |  1 +
>  arch/powerpc/kvm/powerpc.c | 14 +++++++++++---
>  arch/s390/kvm/Kconfig      |  1 +
>  arch/s390/kvm/kvm-s390.c   | 16 ++++++++++++----
>  include/linux/kvm_host.h   | 11 +++++++++++
>  virt/kvm/kvm_main.c        | 12 +++++-------
>  8 files changed, 54 insertions(+), 17 deletions(-)

Using HAVE_KVM_VCPU_ASYNC_IOCTL looks good to me.