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From: Leonardo Bras <leo.bras@arm.com>
To: Tian Zheng <zhengtian10@huawei.com>
Cc: Leonardo Bras <leo.bras@arm.com>,
	maz@kernel.org, oupton@kernel.org, catalin.marinas@arm.com,
	will@kernel.org, corbet@lwn.net, pbonzini@redhat.com,
	yuzenghui@huawei.com, wangzhou1@hisilicon.com,
	yangjinqian1@huawei.com, caijian11@h-partners.com,
	liuyonglong@huawei.com, tangchengchang@huawei.com,
	yezhenyu2@huawei.com, yubihong@huawei.com, linuxarm@huawei.com,
	joey.gouly@arm.com, kvmarm@lists.linux.dev, kvm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, seiden@linux.ibm.com,
	suzuki.poulose@arm.com, fuad.tabba@linux.dev,
	mark.rutland@arm.com, seanjc@google.com, rdunlap@infradead.org,
	linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org,
	skhan@linuxfoundation.org
Subject: Re: [PATCH v5 12/15] KVM: arm64: Derive the VM hardware dirty mode from dirty logging
Date: Mon,  2 Nov 2026 15:03:26 +0000	[thread overview]
Message-ID: <auimPtktqZ1cwk3-@LeoBrasDK> (raw)
In-Reply-To: <20260929103655.85107-13-zhengtian10@huawei.com>

On Tue, Sep 29, 2026 at 06:36:52PM +0800, Tian Zheng wrote:
> Both HAFDBS and HDBSS flip VTCR_EL2.HD at memslot-update time. Two
> independent toggles allow an intermediate HDBSS-set/HD-clear state,
> an illegal combination, and need locking against concurrent updates.
> 
> Replace both with kvm_arch_update_hw_dirty_mode(), a pure function
> of the static capabilities and the number of logging memslots:
> 
>   - logging && HDBSS-capable  -> HD|HA|HDBSS
>   - logging, no HDBSS         -> off
>   - !logging && HAFDBS-cap.   -> HD|HA

This last one is gone now, so I guess most of this patch has to be 
reworked, right?

Thanks!
Leo


  parent reply	other threads:[~2026-11-02 15:03 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-29 10:36 [PATCH v5 00/15] KVM: arm64: FEAT_HDBSS support for stage-2 dirty tracking Tian Zheng
2026-09-29 10:36 ` [PATCH v5 01/15] KVM: arm64: pgtables: Change write bit from S2AP_W to DBM Tian Zheng
2026-09-30  0:25   ` Oliver Upton
2026-09-30  2:44     ` Tian Zheng
2026-10-26 15:02       ` Leonardo Bras
2026-10-29  7:08         ` Tian Zheng
2026-09-29 10:36 ` [PATCH v5 02/15] KVM: arm64: Add KVM_PGTABLE_PROT_DIRTY Tian Zheng
2026-09-30  0:35   ` Oliver Upton
2026-09-30  2:57     ` Tian Zheng
2026-09-29 10:36 ` [PATCH v5 03/15] KVM: arm64: Introduce a dedicated walker for stage2 write-protect Tian Zheng
2026-09-29 10:36 ` [PATCH v5 04/15] KVM: arm64: Add KVM_REQ_RELOAD_STAGE2 Tian Zheng
2026-09-29 10:50   ` sashiko-bot
2026-09-30  1:44     ` Tian Zheng
2026-09-29 10:36 ` [PATCH v5 05/15] KVM: arm64: Harvest stage-2 dirty state into the host folio account Tian Zheng
2026-10-26 18:05   ` Leonardo Bras
2026-10-29 14:02     ` Tian Zheng
2026-10-30 12:24       ` Leonardo Bras
2026-11-06  3:16         ` Tian Zheng
2026-11-06 12:04           ` Leonardo Bras
2026-09-29 10:36 ` [PATCH v5 06/15] KVM: arm64: Add support for FEAT_HDBSS Tian Zheng
2026-10-26 18:12   ` Leonardo Bras
2026-10-30  2:53     ` Tian Zheng
2026-10-30 14:15       ` Leonardo Bras
2026-09-29 10:36 ` [PATCH v5 07/15] KVM: arm64: Add HDBSS per-vCPU buffer management Tian Zheng
2026-10-26 18:27   ` Leonardo Bras
2026-10-30  3:47     ` Tian Zheng
2026-10-30 14:47       ` Leonardo Bras
2026-11-06  8:49         ` Tian Zheng
2026-11-06 15:21           ` Leonardo Bras
2026-09-29 10:36 ` [PATCH v5 08/15] KVM: arm64: Flush the HDBSS buffer on VM exit Tian Zheng
2026-10-27 18:13   ` Leonardo Bras
2026-10-30  4:57     ` Tian Zheng
2026-10-30 16:52       ` Leonardo Bras
2026-11-06  9:02         ` Tian Zheng
2026-09-29 10:36 ` [PATCH v5 09/15] KVM: arm64: Handle HDBSS faults Tian Zheng
2026-09-29 10:53   ` sashiko-bot
2026-11-09  7:36     ` Tian Zheng
2026-11-02 14:34   ` Leonardo Bras
2026-11-06  9:44     ` Tian Zheng
2026-09-29 10:36 ` [PATCH v5 10/15] KVM: Add kvm_arch_dirty_ring_size_updated() hook Tian Zheng
2026-09-29 10:52   ` sashiko-bot
2026-11-09  6:37     ` Tian Zheng
2026-09-29 10:36 ` [PATCH v5 11/15] KVM: arm64: Reserve dirty ring space for the HDBSS buffer Tian Zheng
2026-09-29 11:00   ` sashiko-bot
2026-11-09 10:03     ` Tian Zheng
2026-11-09 18:07       ` Leonardo Bras
2026-11-02 14:54   ` Leonardo Bras
2026-11-06 10:36     ` Tian Zheng
2026-11-06 15:36       ` Leonardo Bras
2026-11-09  4:00         ` Tian Zheng
2026-11-09 18:18           ` Leonardo Bras
2026-11-10  8:54             ` Tian Zheng
2026-11-10 12:49               ` Leonardo Bras
2026-11-12 13:15                 ` Tian Zheng
2026-11-12 15:26                   ` Leonardo Bras
2026-11-06 10:58     ` Tian Zheng
2026-09-29 10:36 ` [PATCH v5 12/15] KVM: arm64: Derive the VM hardware dirty mode from dirty logging Tian Zheng
2026-09-29 11:16   ` sashiko-bot
2026-09-30  8:27     ` Tian Zheng
2026-11-02 15:03   ` Leonardo Bras [this message]
2026-11-06 10:46     ` Tian Zheng
2026-11-06 15:37       ` Leonardo Bras
2026-09-29 10:36 ` [PATCH v5 13/15] KVM: arm64: Add HDBSS buffer size ioctl for dirty-bitmap mode Tian Zheng
2026-11-02 15:12   ` Leonardo Bras
2026-11-06 10:27     ` Tian Zheng
2026-11-06 15:37       ` Leonardo Bras
2026-09-29 10:36 ` [PATCH v5 14/15] KVM: arm64: Document HDBSS buffer size ioctl Tian Zheng
2026-09-29 11:06   ` sashiko-bot
2026-09-29 10:36 ` [PATCH v5 15/15] KVM: arm64: selftests: Add HDBSS buffer size ioctl interface test Tian Zheng

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