From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu
Cc: Zenghui Yu <yuzenghui@huawei.com>,
Eric Auger <eric.auger@redhat.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH] KVM: arm64: vgic-v4: Initialize GICv4.1 even in the absence of a virtual ITS
Date: Sat, 25 Apr 2020 10:44:26 +0100 [thread overview]
Message-ID: <20200425094426.162962-1-maz@kernel.org> (raw)
KVM now expects to be able to use HW-accelerated delivery of vSGIs
as soon as the guest has enabled thm. Unfortunately, we only
initialize the GICv4 context if we have a virtual ITS exposed to
the guest.
Fix it by always initializing the GICv4.1 context if it is
available on the host.
Fixes: 2291ff2f2a56 ("KVM: arm64: GICv4.1: Plumb SGI implementation selection in the distributor")
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
virt/kvm/arm/vgic/vgic-init.c | 9 ++++++++-
virt/kvm/arm/vgic/vgic-mmio-v3.c | 3 ++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index a963b9d766b73..8e6f350c3bcd1 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -294,8 +294,15 @@ int vgic_init(struct kvm *kvm)
}
}
- if (vgic_has_its(kvm)) {
+ if (vgic_has_its(kvm))
vgic_lpi_translation_cache_init(kvm);
+
+ /*
+ * If we have GICv4.1 enabled, unconditionnaly request enable the
+ * v4 support so that we get HW-accelerated vSGIs. Otherwise, only
+ * enable it if we present a virtual ITS to the guest.
+ */
+ if (vgic_supports_direct_msis(kvm)) {
ret = vgic_v4_init(kvm);
if (ret)
goto out;
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index e72dcc4542475..26b11dcd45524 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -50,7 +50,8 @@ bool vgic_has_its(struct kvm *kvm)
bool vgic_supports_direct_msis(struct kvm *kvm)
{
- return kvm_vgic_global_state.has_gicv4 && vgic_has_its(kvm);
+ return (kvm_vgic_global_state.has_gicv4_1 ||
+ (kvm_vgic_global_state.has_gicv4 && vgic_has_its(kvm)));
}
/*
--
2.26.2
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next reply other threads:[~2020-04-25 9:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-25 9:44 Marc Zyngier [this message]
2020-04-30 11:24 ` [PATCH] KVM: arm64: vgic-v4: Initialize GICv4.1 even in the absence of a virtual ITS Zenghui Yu
2020-04-30 11:39 ` Marc Zyngier
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