From: Nicolin Chen <nicolinc@nvidia.com>
To: Mostafa Saleh <smostafa@google.com>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <kvmarm@lists.linux.dev>,
<iommu@lists.linux.dev>, <catalin.marinas@arm.com>,
<will@kernel.org>, <maz@kernel.org>, <oliver.upton@linux.dev>,
<joey.gouly@arm.com>, <suzuki.poulose@arm.com>,
<yuzenghui@huawei.com>, <joro@8bytes.org>, <jgg@ziepe.ca>,
<mark.rutland@arm.com>, <qperret@google.com>, <tabba@google.com>,
<vdonnefort@google.com>
Subject: Re: [PATCH v9 15/25] iommu/arm-smmu-v3-kvm: Add CMDQ functions
Date: Thu, 5 Nov 2026 16:13:50 -0800 [thread overview]
Message-ID: <au0bvjRBF7X+zpc+@nvidia.com> (raw)
In-Reply-To: <20261015200903.2735565-16-smostafa@google.com>
On Thu, Oct 15, 2026 at 08:08:46PM +0000, Mostafa Saleh wrote:
> Add the command queue accessors. The hypervisor's own commands, such as
> TLB invalidations, go through smmu_send_cmd(), which queues the command
> followed by a CMD_SYNC and waits for completion. Filtered host commands
> are copied into the shadow queue with smmu_add_cmd_raw().
>
> Polling is bounded by a 1 ms timeout measured with the architected
> counter, and sleeps in WFE when the SMMU supports SEV.
>
> Split queue_space() out of queue_has_space(), as the emulation will
> check the space in the host's queue.
>
> Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
next prev parent reply other threads:[~2026-11-06 0:14 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-15 20:08 [PATCH v9 00/25] KVM: arm64: SMMUv3 driver for pKVM (trap and emulate) Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 01/25] KVM: arm64: Donate MMIO to the hypervisor Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 02/25] iommu/arm-smmu-v3: Move Queue and STE functions to header Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 03/25] iommu/arm-smmu-v3: Move IDR parsing to common functions Mostafa Saleh
2026-10-20 19:02 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 04/25] iommu/arm-smmu-v3: Move hitless machinery to common code Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 05/25] iommu/arm-smmu-v3: Move RangeInval " Mostafa Saleh
2026-10-20 19:11 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 06/25] KVM: arm64: iommu: Introduce IOMMU driver infrastructure Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 07/25] KVM: arm64: iommu: Shadow host stage-2 page table Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 08/25] KVM: arm64: iommu: Add memory pool Mostafa Saleh
2026-10-15 20:18 ` sashiko-bot
2026-10-15 20:40 ` Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 09/25] KVM: arm64: iommu: Support DABT for IOMMU Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 10/25] iommu/arm-smmu-v3-kvm: Add SMMUv3 driver Mostafa Saleh
2026-10-29 21:18 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 11/25] iommu/arm-smmu-v3-kvm: Add the kernel driver Mostafa Saleh
2026-10-15 20:35 ` sashiko-bot
2026-10-15 20:52 ` Mostafa Saleh
2026-11-05 21:06 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 12/25] iommu/arm-smmu-v3-kvm: Probe SMMU HW Mostafa Saleh
2026-11-05 21:35 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 13/25] iommu/arm-smmu-v3-kvm: Add MMIO emulation Mostafa Saleh
2026-10-15 20:30 ` sashiko-bot
2026-10-15 21:00 ` Mostafa Saleh
2026-11-05 23:04 ` Nicolin Chen
2026-11-06 19:56 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 14/25] iommu/arm-smmu-v3-kvm: Shadow the command queue Mostafa Saleh
2026-10-15 20:28 ` sashiko-bot
2026-10-15 21:01 ` Mostafa Saleh
2026-11-05 23:54 ` Nicolin Chen
2026-11-06 1:59 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 15/25] iommu/arm-smmu-v3-kvm: Add CMDQ functions Mostafa Saleh
2026-10-15 20:30 ` sashiko-bot
2026-10-15 21:11 ` Mostafa Saleh
2026-11-06 0:13 ` Nicolin Chen [this message]
2026-10-15 20:08 ` [PATCH v9 16/25] iommu/arm-smmu-v3-kvm: Emulate CMDQ for host Mostafa Saleh
2026-10-15 20:30 ` sashiko-bot
2026-10-15 21:17 ` Mostafa Saleh
2026-11-06 19:08 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 17/25] iommu/arm-smmu-v3-kvm: Shadow stream table Mostafa Saleh
2026-10-15 20:30 ` sashiko-bot
2026-10-15 21:20 ` Mostafa Saleh
2026-11-06 19:45 ` Nicolin Chen
2026-10-15 20:08 ` [PATCH v9 18/25] iommu/arm-smmu-v3-kvm: Shadow STEs Mostafa Saleh
2026-10-15 20:30 ` sashiko-bot
2026-10-15 21:22 ` Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 19/25] iommu/arm-smmu-v3-kvm: Share other queues Mostafa Saleh
2026-10-15 20:29 ` sashiko-bot
2026-10-15 21:23 ` Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 20/25] iommu/arm-smmu-v3-kvm: Emulate GBPA Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 21/25] iommu/io-pgtable-arm: Support io-pgtable-arm in the hypervisor Mostafa Saleh
2026-10-15 20:26 ` sashiko-bot
2026-10-15 21:24 ` Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 22/25] iommu/arm-smmu-v3-kvm: Shadow the CPU stage-2 page table Mostafa Saleh
2026-10-15 20:32 ` sashiko-bot
2026-10-15 21:32 ` Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 23/25] iommu/arm-smmu-v3-kvm: Invalidate the SMMU TLBs Mostafa Saleh
2026-10-15 20:28 ` sashiko-bot
2026-10-15 21:35 ` Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 24/25] iommu/arm-smmu-v3-kvm: Enable nesting Mostafa Saleh
2026-10-15 20:34 ` sashiko-bot
2026-10-15 21:37 ` Mostafa Saleh
2026-10-15 20:08 ` [PATCH v9 25/25] KVM: arm64: Add documentation for pKVM DMA isolation Mostafa Saleh
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