From: Darren Hart <darren@os.amperecomputing.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Vishnu Pajjuri <vishnu@os.amperecomputing.com>,
Fuad Tabba <tabba@google.com>, Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oupton@kernel.org>,
Zenghui Yu <yuzenghui@huawei.com>,
Christoffer Dall <christoffer.dall@arm.com>,
Mark Brown <broonie@kernel.org>,
kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
kvmarm@lists.linux.dev
Subject: Re: [PATCH v4 35/49] KVM: arm64: GICv3: nv: Plug L1 LR sync into deactivation primitive
Date: Thu, 23 Apr 2026 17:02:40 -0700 [thread overview]
Message-ID: <aeqzIIT2n86CxB-T@Fedora> (raw)
In-Reply-To: <86eck71o1v.wl-maz@kernel.org>
On Wed, Apr 22, 2026 at 07:55:56AM +0100, Marc Zyngier wrote:
> [+ Darren]
>
Thanks for the head's up Marc.
> On Tue, 31 Mar 2026 10:42:57 +0100,
> Marc Zyngier <maz@kernel.org> wrote:
> > >
...
> > > Although this behavior is puzzling, it matches the trace I typically
> > > observe on L0. After reverting the patch, I was able to boot L2 guests
> > > successfully.
> >
> > Well, this patch fixes real bugs, so it isn't going anywhere.
Understood.
>
> Have you made progress on this? I can't reproduce it at all despite my
> best effort. I'm perfectly happy to help, but you need to give me
> *something* to go on.
>
I didn't give this the attention it deserved. I've now got Vishnu the
resources he needs to help move this forward. We owe you something
concrete/actionable/reproducible and we'll report back once we have it.
--
Darren Hart
Ampere Computing / Linux Enabling
next prev parent reply other threads:[~2026-04-24 0:03 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-20 17:24 [PATCH v4 00/49] KVM: arm64: Add LR overflow infrastructure (the final one, I swear!) Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 01/49] irqchip/gic: Add missing GICH_HCR control bits Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 02/49] irqchip/gic: Expose CPU interface VA to KVM Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 03/49] irqchip/apple-aic: Spit out ICH_MISR_EL2 value on spurious vGIC MI Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 04/49] KVM: arm64: Turn vgic-v3 errata traps into a patched-in constant Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 05/49] KVM: arm64: vgic-v3: Fix GICv3 trapping in protected mode Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 06/49] KVM: arm64: GICv3: Detect and work around the lack of ICV_DIR_EL1 trapping Marc Zyngier
2025-11-25 11:26 ` Suzuki K Poulose
2025-11-25 13:48 ` Marc Zyngier
2025-11-25 14:14 ` Suzuki K Poulose
2025-11-25 15:01 ` Marc Zyngier
2025-11-25 15:03 ` Suzuki K Poulose
2025-11-20 17:24 ` [PATCH v4 07/49] KVM: arm64: Repack struct vgic_irq fields Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 08/49] KVM: arm64: Add tracking of vgic_irq being present in a LR Marc Zyngier
2025-11-20 17:24 ` [PATCH v4 09/49] KVM: arm64: Add LR overflow handling documentation Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 10/49] KVM: arm64: GICv3: Drop LPI active state when folding LRs Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 11/49] KVM: arm64: GICv3: Preserve EOIcount on exit Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 12/49] KVM: arm64: GICv3: Decouple ICH_HCR_EL2 programming from LRs Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 13/49] KVM: arm64: GICv3: Extract LR folding primitive Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 14/49] KVM: arm64: GICv3: Extract LR computing primitive Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 15/49] KVM: arm64: GICv2: Preserve EOIcount on exit Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 16/49] KVM: arm64: GICv2: Decouple GICH_HCR programming from LRs being loaded Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 17/49] KVM: arm64: GICv2: Extract LR folding primitive Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 18/49] KVM: arm64: GICv2: Extract LR computing primitive Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 19/49] KVM: arm64: Compute vgic state irrespective of the number of interrupts Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 20/49] KVM: arm64: Eagerly save VMCR on exit Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 21/49] KVM: arm64: Revamp vgic maintenance interrupt configuration Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 22/49] KVM: arm64: Turn kvm_vgic_vcpu_enable() into kvm_vgic_vcpu_reset() Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 23/49] KVM: arm64: Make vgic_target_oracle() globally available Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 24/49] KVM: arm64: Invert ap_list sorting to push active interrupts out Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 25/49] KVM: arm64: Move undeliverable interrupts to the end of ap_list Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 26/49] KVM: arm64: Use MI to detect groups being enabled/disabled Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 27/49] KVM: arm64: GICv3: Handle LR overflow when EOImode==0 Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 28/49] KVM: arm64: GICv3: Handle deactivation via ICV_DIR_EL1 traps Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 29/49] KVM: arm64: GICv3: Add GICv2 SGI handling to deactivation primitive Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 30/49] KVM: arm64: GICv3: Set ICH_HCR_EL2.TDIR when interrupts overflow LR capacity Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 31/49] KVM: arm64: GICv3: Add SPI tracking to handle asymmetric deactivation Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 32/49] KVM: arm64: GICv3: Handle in-LR deactivation when possible Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 33/49] KVM: arm64: GICv3: Avoid broadcast kick on CPUs lacking TDIR Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 34/49] KVM: arm64: GICv3: nv: Resync LRs/VMCR/HCR early for better MI emulation Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 35/49] KVM: arm64: GICv3: nv: Plug L1 LR sync into deactivation primitive Marc Zyngier
2026-03-30 11:51 ` Vishnu Pajjuri
2026-03-30 12:17 ` Marc Zyngier
2026-03-31 6:31 ` Vishnu Pajjuri
2026-03-31 9:42 ` Marc Zyngier
2026-04-22 6:55 ` Marc Zyngier
2026-04-22 14:57 ` Vishnu Pajjuri
2026-04-24 0:02 ` Darren Hart [this message]
2025-11-20 17:25 ` [PATCH v4 36/49] KVM: arm64: GICv3: Force exit to sync ICH_HCR_EL2.En Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 37/49] KVM: arm64: GICv2: Handle LR overflow when EOImode==0 Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 38/49] KVM: arm64: GICv2: Handle deactivation via GICV_DIR traps Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 39/49] KVM: arm64: GICv2: Always trap GICV_DIR register Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 40/49] KVM: arm64: selftests: gic_v3: Add irq group setting helper Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 41/49] KVM: arm64: selftests: gic_v3: Disable Group-0 interrupts by default Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 42/49] KVM: arm64: selftests: vgic_irq: Fix GUEST_ASSERT_IAR_EMPTY() helper Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 43/49] KVM: arm64: selftests: vgic_irq: Change configuration before enabling interrupt Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 44/49] KVM: arm64: selftests: vgic_irq: Exclude timer-controlled interrupts Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 45/49] KVM: arm64: selftests: vgic_irq: Remove LR-bound limitation Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 46/49] KVM: arm64: selftests: vgic_irq: Perform EOImode==1 deactivation in ack order Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 47/49] KVM: arm64: selftests: vgic_irq: Add asymmetric SPI deaectivation test Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 48/49] KVM: arm64: selftests: vgic_irq: Add Group-0 enable test Marc Zyngier
2025-11-20 17:25 ` [PATCH v4 49/49] KVM: arm64: selftests: vgic_irq: Add timer deactivation test Marc Zyngier
2025-11-21 14:15 ` [PATCH v4 00/49] KVM: arm64: Add LR overflow infrastructure (the final one, I swear!) Mark Brown
2025-11-24 22:44 ` Oliver Upton
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