From: Marc Zyngier <maz@kernel.org>
To: Oliver Upton <oliver.upton@linux.dev>
Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
kvm@vger.kernel.org, James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Alexander Potapenko <glider@google.com>,
stable@vger.kernel.org
Subject: Re: [PATCH 01/12] KVM: arm64: Make ICC_*SGI*_EL1 undef in the absence of a vGICv3
Date: Wed, 21 Aug 2024 11:59:52 +0100 [thread overview]
Message-ID: <86le0qxhsn.wl-maz@kernel.org> (raw)
In-Reply-To: <ZsUOtp9kfpqm1enx@linux.dev>
On Tue, 20 Aug 2024 22:46:30 +0100,
Oliver Upton <oliver.upton@linux.dev> wrote:
>
> On Tue, Aug 20, 2024 at 11:03:38AM +0100, Marc Zyngier wrote:
> > On a system with a GICv3, if a guest hasn't been configured with
> > GICv3 and that the host is not capable of GICv2 emulation,
> > a write to any of the ICC_*SGI*_EL1 registers is trapped to EL2.
> >
> > We therefore try to emulate the SGI access, only to hit a NULL
> > pointer as no private interrupt is allocated (no GIC, remember?).
> >
> > The obvious fix is to give the guest what it deserves, in the
> > shape of a UNDEF exception.
> >
> > Reported-by: Alexander Potapenko <glider@google.com>
> > Signed-off-by: Marc Zyngier <maz@kernel.org>
> > Cc: stable@vger.kernel.org
>
> LGTM, and just as an FYI I do plan on grabbing this for 6.11
Great, thanks. Are you planning to route this via arm64, given that
Paolo is away for a bit?
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2024-08-21 11:07 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-20 10:03 [PATCH 00/12] KVM: arm64: Handle the lack of GICv3 exposed to a guest Marc Zyngier
2024-08-20 10:03 ` [PATCH 01/12] KVM: arm64: Make ICC_*SGI*_EL1 undef in the absence of a vGICv3 Marc Zyngier
2024-08-20 21:46 ` Oliver Upton
2024-08-21 10:59 ` Marc Zyngier [this message]
2024-08-21 16:53 ` Oliver Upton
2024-08-22 8:15 ` (subset) " Oliver Upton
2024-08-20 10:03 ` [PATCH 02/12] KVM: arm64: Move GICv3 trap configuration to kvm_calculate_traps() Marc Zyngier
2024-08-20 10:03 ` [PATCH 03/12] KVM: arm64: Force SRE traps when SRE access is not enabled Marc Zyngier
2024-08-20 23:19 ` Oliver Upton
2024-08-21 11:05 ` Marc Zyngier
2024-08-20 10:03 ` [PATCH 04/12] KVM: arm64: Force GICv3 traps activa when no irqchip is configured on VHE Marc Zyngier
2024-08-20 23:33 ` Oliver Upton
2024-08-21 11:13 ` Marc Zyngier
2024-08-21 16:52 ` Oliver Upton
2024-08-20 10:03 ` [PATCH 05/12] KVM: arm64: Add helper for last ditch idreg adjustments Marc Zyngier
2024-08-20 10:03 ` [PATCH 06/12] KVM: arm64: Zero ID_AA64PFR0_EL1.GIC when no GICv3 is presented to the guest Marc Zyngier
2024-08-20 23:50 ` Oliver Upton
2024-08-21 11:16 ` Marc Zyngier
2024-08-20 10:03 ` [PATCH 07/12] KVM: arm64: Add ICH_HCR_EL2 to the vcpu state Marc Zyngier
2024-08-20 10:03 ` [PATCH 08/12] KVM: arm64: Add trap routing information for ICH_HCR_EL2 Marc Zyngier
2024-08-20 10:03 ` [PATCH 09/12] KVM: arm64: Honor guest requested traps in GICv3 emulation Marc Zyngier
2024-08-20 10:03 ` [PATCH 10/12] KVM: arm64: Make most GICv3 accesses UNDEF if they trap Marc Zyngier
2024-08-20 10:03 ` [PATCH 11/12] KVM: arm64: Unify UNDEF injection helpers Marc Zyngier
2024-08-20 10:03 ` [PATCH 12/12] KVM: arm64: Add selftest checking how the absence of GICv3 is handled Marc Zyngier
2024-08-21 0:10 ` Oliver Upton
2024-08-21 11:17 ` Marc Zyngier
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