linux-kernel - Re: [PATCH] kvm: move advertising of KVM_CAP

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Date:	Thu, 5 Mar 2015 12:06:49 +0100
From:	Greg Kurz <gkurz@...ux.vnet.ibm.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>, stable@...r.kernel.org
Subject: Re: [PATCH] kvm: move advertising of KVM_CAP_IRQFD to common code

On Thu,  5 Mar 2015 11:54:46 +0100
Paolo Bonzini <pbonzini@...hat.com> wrote:
> POWER supports irqfds but forgot to advertise them.  Some userspace does
> not check for the capability, but others check it---thus they work on
> x86 and s390 but not POWER.
> 
> To avoid that other architectures in the future make the same mistake, let
> common code handle KVM_CAP_IRQFD the same way as KVM_CAP_IRQFD_RESAMPLE.
> 
> Reported-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>
> Cc: stable@...r.kernel.org
> Fixes: 297e21053a52f060944e9f0de4c64fad9bcd72fc
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Thanks !

Tested-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>

> 	Marcelo, please apply this for 4.0.
> ---
>  arch/s390/kvm/kvm-s390.c | 1 -
>  arch/x86/kvm/x86.c       | 1 -
>  virt/kvm/kvm_main.c      | 1 +
>  3 files changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 0c3623927563..17277968e50a 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -165,7 +165,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>  	case KVM_CAP_ONE_REG:
>  	case KVM_CAP_ENABLE_CAP:
>  	case KVM_CAP_S390_CSS_SUPPORT:
> -	case KVM_CAP_IRQFD:
>  	case KVM_CAP_IOEVENTFD:
>  	case KVM_CAP_DEVICE_CTRL:
>  	case KVM_CAP_ENABLE_CAP_VM:
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index bd7a70be41b3..32bf19ef3115 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -2744,7 +2744,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>  	case KVM_CAP_USER_NMI:
>  	case KVM_CAP_REINJECT_CONTROL:
>  	case KVM_CAP_IRQ_INJECT_STATUS:
> -	case KVM_CAP_IRQFD:
>  	case KVM_CAP_IOEVENTFD:
>  	case KVM_CAP_IOEVENTFD_NO_LENGTH:
>  	case KVM_CAP_PIT2:
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index a1093700f3a4..a2214d9609bd 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2492,6 +2492,7 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>  	case KVM_CAP_SIGNAL_MSI:
>  #endif
>  #ifdef CONFIG_HAVE_KVM_IRQFD
> +	case KVM_CAP_IRQFD:
>  	case KVM_CAP_IRQFD_RESAMPLE:
>  #endif
>  	case KVM_CAP_CHECK_EXTENSION_VM:

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