linux-kernel - Re: [PATCH v4 09/12] KVM: arm/arm64: Check all vcpu redistributors are set on map_resources

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Message-ID: <20180429123533.GE7512@C02W217FHV2R.local>
Date:   Sun, 29 Apr 2018 14:35:33 +0200
From:   Christoffer Dall <christoffer.dall@....com>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        marc.zyngier@....com, peter.maydell@...aro.org,
        andre.przywara@....com
Subject: Re: [PATCH v4 09/12] KVM: arm/arm64: Check all vcpu redistributors
 are set on map_resources

On Fri, Apr 27, 2018 at 04:15:02PM +0200, Eric Auger wrote:
> On vcpu first run, we eventually know the actual number of vcpus.
> This is a synchronization point to check all redistributors
> were assigned. On kvm_vgic_map_resources() we check both dist and
> redist were set, eventually check potential base address inconsistencies.
> 
> Signed-off-by: Eric Auger <eric.auger@...hat.com>

Reviewed-by: Christoffer Dall <christoffer.dall@....com>

> 
> ---
> 
> v3 -> v4:
> - use kvm_debug
> ---
>  virt/kvm/arm/vgic/vgic-v3.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
> index c4a2a46..5563671 100644
> --- a/virt/kvm/arm/vgic/vgic-v3.c
> +++ b/virt/kvm/arm/vgic/vgic-v3.c
> @@ -484,16 +484,25 @@ struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rd_regions)
>  
>  int vgic_v3_map_resources(struct kvm *kvm)
>  {
> -	int ret = 0;
>  	struct vgic_dist *dist = &kvm->arch.vgic;
> -	struct vgic_redist_region *rdreg =
> -		list_first_entry(&dist->rd_regions,
> -				 struct vgic_redist_region, list);
> +	struct kvm_vcpu *vcpu;
> +	int ret = 0;
> +	int c;
>  
>  	if (vgic_ready(kvm))
>  		goto out;
>  
> -	if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base) || !rdreg) {
> +	kvm_for_each_vcpu(c, vcpu, kvm) {
> +		struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
> +
> +		if (IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr)) {
> +			kvm_debug("vcpu %d redistributor base not set\n", c);
> +			ret = -ENXIO;
> +			goto out;
> +		}
> +	}
> +
> +	if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base)) {
>  		kvm_err("Need to set vgic distributor addresses first\n");
>  		ret = -ENXIO;
>  		goto out;
> -- 
> 2.5.5
> 
> _______________________________________________
> kvmarm mailing list
> kvmarm@...ts.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

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