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Tue, 23 Jul 2019 12:39:14 +0000 (UTC) Received: from [10.36.117.239] (ovpn-117-239.ams2.redhat.com [10.36.117.239]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 943EF5D9D3; Tue, 23 Jul 2019 12:39:10 +0000 (UTC) Subject: Re: [PATCH v2 3/9] KVM: arm/arm64: vgic-its: Add MSI-LPI translation cache invalidation To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org References: <20190611170336.121706-1-marc.zyngier@arm.com> <20190611170336.121706-4-marc.zyngier@arm.com> From: Auger Eric Message-ID: <00033552-f4e1-81c0-1e7d-09f2593b758a@redhat.com> Date: Tue, 23 Jul 2019 14:39:07 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190611170336.121706-4-marc.zyngier@arm.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 23 Jul 2019 12:39:15 +0000 (UTC) Cc: "Raslan, KarimAllah" , "Saidi, Ali" X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Hi Marc, On 6/11/19 7:03 PM, Marc Zyngier wrote: > There's a number of cases where we need to invalidate the caching > of translations, so let's add basic support for that. > > Signed-off-by: Marc Zyngier Reviewed-by: Eric Auger Thanks Eric > --- > virt/kvm/arm/vgic/vgic-its.c | 23 +++++++++++++++++++++++ > virt/kvm/arm/vgic/vgic.h | 1 + > 2 files changed, 24 insertions(+) > > diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c > index ce9bcddeb7f1..9b6b66204b97 100644 > --- a/virt/kvm/arm/vgic/vgic-its.c > +++ b/virt/kvm/arm/vgic/vgic-its.c > @@ -546,6 +546,29 @@ static unsigned long vgic_mmio_read_its_idregs(struct kvm *kvm, > return 0; > } > > +void vgic_its_invalidate_cache(struct kvm *kvm) > +{ > + struct vgic_dist *dist = &kvm->arch.vgic; > + struct vgic_translation_cache_entry *cte; > + unsigned long flags; > + > + raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); > + > + list_for_each_entry(cte, &dist->lpi_translation_cache, entry) { > + /* > + * If we hit a NULL entry, there is nothing after this > + * point. > + */ > + if (!cte->irq) > + break; > + > + __vgic_put_lpi_locked(kvm, cte->irq); > + cte->irq = NULL; > + } > + > + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); > +} > + > int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its, > u32 devid, u32 eventid, struct vgic_irq **irq) > { > diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h > index afac2fed7df4..072f810dc441 100644 > --- a/virt/kvm/arm/vgic/vgic.h > +++ b/virt/kvm/arm/vgic/vgic.h > @@ -319,6 +319,7 @@ int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its, > struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi); > void vgic_lpi_translation_cache_init(struct kvm *kvm); > void vgic_lpi_translation_cache_destroy(struct kvm *kvm); > +void vgic_its_invalidate_cache(struct kvm *kvm); > > bool vgic_supports_direct_msis(struct kvm *kvm); > int vgic_v4_init(struct kvm *kvm); > _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm