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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190725_012448_619053_02D3701D X-CRM114-Status: GOOD ( 17.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Suzuki K Poulose , "Raslan, KarimAllah" , Julien Thierry , Christoffer Dall , James Morse , Zenghui Yu , "Saidi, Ali" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 23/07/2019 16:14, Auger Eric wrote: > 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 >> --- >> 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. Yeah, I wouldn't worry about that. If there is a screaming device, so be it. The guest should know better... >> + } >> + >> + return -EWOULDBLOCK; >> +} >> + >> int kvm_vgic_setup_default_irq_routing(struct kvm *kvm) >> { >> struct kvm_irq_routing_entry *entries; >> > Reviewed-by: Eric Auger Thanks Eric. M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel