From: Marc Zyngier <maz@kernel.org>
To: Oliver Upton <oliver.upton@linux.dev>
Cc: kvmarm@lists.linux.dev, Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: Re: [PATCH 0/4] KVM: arm64: Fixes/clarification for GICv4 vLPI injection
Date: Wed, 26 Feb 2025 18:58:51 +0000 [thread overview]
Message-ID: <864j0gr0r8.wl-maz@kernel.org> (raw)
In-Reply-To: <20250226183124.82094-1-oliver.upton@linux.dev>
On Wed, 26 Feb 2025 18:31:20 +0000,
Oliver Upton <oliver.upton@linux.dev> wrote:
>
> Small batch of fixes for vLPI injection issues that can happen when
> userspace is being mean:
>
> - MSI interrupt sources could be mapped to non-MSI GSI routing entries.
> KVM doesn't account for the routing type and blindly attempts to map
> a vLPI.
>
> - KVM_IRQFD mappings could be installed before the ITS has been
> restored, leading to kvm_vgic_v4_set_forwarding() failing due to the
> missing guest translation
>
> Prevent userspace from triggering a WARN() because of these issues and
> gracefully fall back to software vLPI routing/injection should irqbypass
> fail.
>
> I've thrown in some documentation on the restore ordering necessary to get
> GICv4 vLPI injection working correctly as well.
>
> Marc, I'm planning to take these for 6.15.
Go for it.
Acked-by: Marc Zyngier <maz@kernel.org>
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2025-02-26 18:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-26 18:31 [PATCH 0/4] KVM: arm64: Fixes/clarification for GICv4 vLPI injection Oliver Upton
2025-02-26 18:31 ` [PATCH 1/4] KVM: arm64: vgic-v4: Only attempt vLPI mapping for actual MSIs Oliver Upton
2025-02-26 18:31 ` [PATCH 2/4] KVM: arm64: vgic-v4: Only WARN for HW IRQ mismatch when unmapping vLPI Oliver Upton
2025-02-26 18:31 ` [PATCH 3/4] KVM: arm64: vgic-v4: Fall back to software irqbypass if LPI not found Oliver Upton
2025-02-26 18:31 ` [PATCH 4/4] KVM: arm64: Document ordering requirements for irqbypass Oliver Upton
2025-02-26 18:58 ` Marc Zyngier [this message]
2025-02-26 21:27 ` [PATCH 0/4] KVM: arm64: Fixes/clarification for GICv4 vLPI injection Oliver Upton
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