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From: Auger Eric <eric.auger@redhat.com>
To: Marc Zyngier <marc.zyngier@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: "Raslan, KarimAllah" <karahmed@amazon.de>,
	"Saidi, Ali" <alisaidi@amazon.com>
Subject: Re: [PATCH v2 9/9] KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic
Date: Tue, 23 Jul 2019 17:14:56 +0200
Message-ID: <a63b08b8-9539-09b4-1060-7c0d2f2eacac@redhat.com> (raw)
In-Reply-To: <20190611170336.121706-10-marc.zyngier@arm.com>

Hi Marc,

On 6/11/19 7:03 PM, Marc Zyngier wrote:
> Now that we have a cache of MSI->LPI translations, it is pretty
> easy to implement kvm_arch_set_irq_inatomic (this cache can be
> parsed without sleeping).
> 
> Hopefully, this will improve some LPI-heavy workloads.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  virt/kvm/arm/vgic/vgic-irqfd.c | 36 ++++++++++++++++++++++++++++------
>  1 file changed, 30 insertions(+), 6 deletions(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-irqfd.c b/virt/kvm/arm/vgic/vgic-irqfd.c
> index 99e026d2dade..9f203ed8c8f3 100644
> --- a/virt/kvm/arm/vgic/vgic-irqfd.c
> +++ b/virt/kvm/arm/vgic/vgic-irqfd.c
> @@ -77,6 +77,15 @@ int kvm_set_routing_entry(struct kvm *kvm,
>  	return r;
>  }
>  
> +static void kvm_populate_msi(struct kvm_kernel_irq_routing_entry *e,
> +			     struct kvm_msi *msi)
> +{
> +	msi->address_lo = e->msi.address_lo;
> +	msi->address_hi = e->msi.address_hi;
> +	msi->data = e->msi.data;
> +	msi->flags = e->msi.flags;
> +	msi->devid = e->msi.devid;
> +}
>  /**
>   * kvm_set_msi: inject the MSI corresponding to the
s/:/ -
>   * MSI routing entry
> @@ -90,21 +99,36 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
>  {
>  	struct kvm_msi msi;
>  
> -	msi.address_lo = e->msi.address_lo;
> -	msi.address_hi = e->msi.address_hi;
> -	msi.data = e->msi.data;
> -	msi.flags = e->msi.flags;
> -	msi.devid = e->msi.devid;
> -
>  	if (!vgic_has_its(kvm))
>  		return -ENODEV;
>  
>  	if (!level)
>  		return -1;
>  
> +	kvm_populate_msi(e, &msi);
>  	return vgic_its_inject_msi(kvm, &msi);
>  }
>  
> +/**
> + * kvm_arch_set_irq_inatomic: fast-path for irqfd injection
s/:/ -
> + *
> + * Currently only direct MSI injecton is supported.
injection
> + */
> +int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
> +			      struct kvm *kvm, int irq_source_id, int level,
> +			      bool line_status)
> +{
> +	if (e->type == KVM_IRQ_ROUTING_MSI && vgic_has_its(kvm) && level) {
> +		struct kvm_msi msi;
> +
> +		kvm_populate_msi(e, &msi);
> +		if (!vgic_its_inject_cached_translation(kvm, &msi))
> +			return 0;
if this fails since its->enabled is false we will re-attempt the
injection though the normal injection path but that's not a big deal.
> +	}
> +
> +	return -EWOULDBLOCK;
> +}
> +
>  int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
>  {
>  	struct kvm_irq_routing_entry *entries;
> 
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric
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  reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-11 17:03 [PATCH v2 0/9] KVM: arm/arm64: vgic: ITS translation cache Marc Zyngier
2019-06-11 17:03 ` [PATCH v2 1/9] KVM: arm/arm64: vgic: Add LPI translation cache definition Marc Zyngier
2019-06-12  8:16   ` Julien Thierry
2019-06-12  8:49     ` Julien Thierry
2019-06-12  9:52     ` Marc Zyngier
2019-06-12 10:58       ` Julien Thierry
2019-06-12 12:28         ` Julien Thierry
2019-07-23 12:43   ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 2/9] KVM: arm/arm64: vgic: Add __vgic_put_lpi_locked primitive Marc Zyngier
2019-06-11 17:03 ` [PATCH v2 3/9] KVM: arm/arm64: vgic-its: Add MSI-LPI translation cache invalidation Marc Zyngier
2019-07-23 12:39   ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 4/9] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on specific commands Marc Zyngier
2019-07-01 12:38   ` Auger Eric
2019-07-22 10:54     ` Marc Zyngier
2019-07-23 12:25       ` Auger Eric
2019-07-23 12:43         ` Marc Zyngier
2019-07-23 12:47           ` Auger Eric
2019-07-23 12:50             ` Marc Zyngier
2019-06-11 17:03 ` [PATCH v2 5/9] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on disabling LPIs Marc Zyngier
2019-07-23 15:09   ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 6/9] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on vgic teardown Marc Zyngier
2019-07-23 15:10   ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 7/9] KVM: arm/arm64: vgic-its: Cache successful MSI->LPI translation Marc Zyngier
2019-06-25 11:50   ` Zenghui Yu
2019-06-25 12:31     ` Marc Zyngier
2019-06-25 16:00       ` Zenghui Yu
2019-06-26  3:54         ` Zenghui Yu
2019-06-26  7:55         ` Marc Zyngier
2019-07-23 15:21   ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 8/9] KVM: arm/arm64: vgic-its: Check the LPI translation cache on MSI injection Marc Zyngier
2019-07-23 15:10   ` Auger Eric
2019-07-23 15:45     ` Marc Zyngier
2019-07-24  7:41       ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 9/9] KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic Marc Zyngier
2019-07-23 15:14   ` Auger Eric [this message]
2019-07-25  8:24     ` Marc Zyngier
2019-07-23 11:14 ` [PATCH v2 0/9] KVM: arm/arm64: vgic: ITS translation cache Andre Przywara
2019-07-25  8:50   ` Marc Zyngier
2019-07-25 10:01     ` Andre Przywara
2019-07-25 15:37       ` Marc Zyngier

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