linux-kernel - Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit

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Message-ID: <20150805134821.GA1481@potion.brq.redhat.com>
Date:	Wed, 5 Aug 2015 15:48:22 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 3/5] KVM: add KVM_USER_EXIT vm ioctl for userspace exit

2015-08-05 15:38+0200, Paolo Bonzini:
> On 05/08/2015 15:34, Radim Krčmář wrote:
>> vcpu ioctl should only be issued by the vcpu thread so it would
>> significantly limit use.
> 
> That's a general limitation, but you can lift it for particular ioctls.
> 
> See in particular this:
> 
> #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
>         /*
>          * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
>          * so vcpu_load() would break it.
>          */
>         if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
>                 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
> #endif
> 
> You can add an "if (ioctl == KVM_USER_EXIT)" before.

Thanks, it looks to be safe, I'll put it in v2.
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