From: Marc Zyngier <marc.zyngier@arm.com>
To: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
"Raslan, KarimAllah" <karahmed@amazon.de>,
Julien Thierry <julien.thierry@arm.com>,
Christoffer Dall <christoffer.dall@arm.com>,
Eric Auger <eric.auger@redhat.com>,
James Morse <james.morse@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
"Saidi, Ali" <alisaidi@amazon.com>
Subject: [PATCH v2 9/9] KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic
Date: Tue, 11 Jun 2019 18:03:36 +0100 [thread overview]
Message-ID: <20190611170336.121706-10-marc.zyngier@arm.com> (raw)
In-Reply-To: <20190611170336.121706-1-marc.zyngier@arm.com>
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
* 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
+ *
+ * Currently only direct MSI injecton is supported.
+ */
+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;
+ }
+
+ return -EWOULDBLOCK;
+}
+
int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
{
struct kvm_irq_routing_entry *entries;
--
2.20.1
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next prev parent reply other threads:[~2019-06-11 17:06 UTC|newest]
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 ` Marc Zyngier [this message]
2019-07-23 15:14 ` [PATCH v2 9/9] KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic Auger Eric
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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