From: Marc Zyngier <maz@kernel.org>
To: leixiang <leixiang@kylinos.cn>
Cc: oupton@kernel.org, seanjc@google.com, pbonzini@redhat.com,
kvmarm@lists.linux.dev, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Eric Auger <eauger@redhat.com>
Subject: Re: [RFC PATCH] KVM: arm64: Set irqfd->producer to enable vLPI routing updates
Date: Tue, 23 Jun 2026 10:52:00 +0100 [thread overview]
Message-ID: <86v7b9r3cv.wl-maz@kernel.org> (raw)
In-Reply-To: <20260623081433.21250-1-leixiang@kylinos.cn>
+ Eric
On Tue, 23 Jun 2026 09:14:33 +0100,
leixiang <leixiang@kylinos.cn> wrote:
>
> ARM64's kvm_arch_irq_bypass_add_producer() never sets irqfd->producer,
> so kvm_irq_routing_update() never calls the ARM64 routing hook. That
> hook unmaps the vLPI and falls back to software injection when an
> irqfd's MSI routing changes; with it dead, the vLPI stays bound to the
> old translation.
/confused. Why should userspace be in control of anything? There is no
real "routing" involved (that's the guest's responsibility), and we
are really trying to hide the fact that VLPIs are used to deliver
guest-visible LPIs.
Can you explain what this is achieving?
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2026-06-23 9:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-22 7:51 [PATCH] KVM: Nullify irqfd->producer when add_producer() fails leixiang
2026-06-22 8:08 ` sashiko-bot
2026-06-23 8:14 ` [RFC PATCH] KVM: arm64: Set irqfd->producer to enable vLPI routing updates leixiang
2026-06-23 8:30 ` sashiko-bot
2026-06-23 9:52 ` Marc Zyngier [this message]
2026-06-23 10:26 ` leixiang
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