From: Farhan Ali <alifm@linux.ibm.com>
To: Konstantin Shkolnyy <kshk@linux.ibm.com>, mjrosato@linux.ibm.com
Cc: farman@linux.ibm.com, richard.henderson@linaro.org,
iii@linux.ibm.com, david@kernel.org, cohuck@redhat.com,
pasic@linux.ibm.com, borntraeger@linux.ibm.com,
qemu-s390x@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [PATCH v12 15/17] s390x/pci: Provide each zpci device with a unique stable bus "path"
Date: Tue, 6 Oct 2026 13:13:24 -0700 [thread overview]
Message-ID: <e3261ca6-e7fc-451b-bad4-8732bfb2e096@linux.ibm.com> (raw)
In-Reply-To: <20261006001643.420929-16-kshk@linux.ibm.com>
On 10/5/2026 5:16 PM, Konstantin Shkolnyy wrote:
> This is necessary for the follow-on migration support. The new unique
> UID-based bus "path" is used as part of idstr in the migration stream,
> making idstr unique and instance_id always 0.
>
> For migration to succeed, (idstr+instance_id) must match those generated
> during QEMU start. Without unique idstr, QEMU will generate variable
> instance_id to distinguish devices, and that instance_id can change
> if a device is unplugged and plugged back, preventing migration.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
> hw/s390x/s390-pci-bus.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
next prev parent reply other threads:[~2026-10-07 8:39 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-06 0:16 [PATCH v12 00/17] s390x/pci: Implement migration for emulated devices Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 01/17] s390x/pci: implement IOMMU replay Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 02/17] s390x/pci: Create function to contain translation status check Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 03/17] s390x/pci: Move iommu_mr from S390PCIIOMMU to S390PCIBusDevice Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 04/17] s390x/pci: Move dm_mr " Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 05/17] s390x/pci: Move iotlb " Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 06/17] s390x/pci: Remove a ptr to S390PCIBusDevice from S390PCIIOMMU Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 07/17] s390x/pci: Move/rename enabled from S390PCIIOMMU to S390PCIBusDevice Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 08/17] s390x/pci: Move dma_limit " Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 09/17] s390x/pci: Move g_iota " Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 10/17] s390x/pci: Move pba " Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 11/17] s390x/pci: Move pal " Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 12/17] s390x/pci: Move max_dma_limit " Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 13/17] s390x/pci: Add a comment explaining S390PCIIOMMU purpose Konstantin Shkolnyy
2026-10-06 0:16 ` [PATCH v12 14/17] s390x/pci: Move ioat sanity checks into new function, add error message Konstantin Shkolnyy
2026-10-06 16:45 ` Matthew Rosato
2026-10-06 0:16 ` [PATCH v12 15/17] s390x/pci: Provide each zpci device with a unique stable bus "path" Konstantin Shkolnyy
2026-10-06 16:48 ` Matthew Rosato
2026-10-06 20:13 ` Farhan Ali [this message]
2026-10-06 0:16 ` [PATCH v12 16/17] s390x/pci: Implement migration for emulated devices Konstantin Shkolnyy
2026-10-06 20:35 ` Matthew Rosato
2026-10-06 21:13 ` Farhan Ali
2026-10-06 0:16 ` [PATCH v12 17/17] s390x/pci: Create function to contain fmb_timer start Konstantin Shkolnyy
2026-10-07 17:35 ` [PATCH v12 00/17] s390x/pci: Implement migration for emulated devices Eric Farman
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